Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal concentrationIn this case, you know for the first dilution:
Ci= 1.50 MVi= 68 mLCf= ?Vf= 208 mLReplacing in the definition of dilution:
1.50 M× 68 mL= Cf× 208 mL
Solving:
(1.50 M× 68 mL)÷ 208 mL= Cf
0.49 M= Cf
Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be
Vfinal= 104 mL + 161 mL= 265 mL
The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:
0.49 M× 104 mL= Cf× 265 mL
Solving:
(0.49 M× 104 mL)÷ 265 mL= Cf
0.1923 M= Cf
In summary, the final concentration is 0.1923 M.
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How many moles are in 68.43g of calcium metal?
The number of moles are in 68.43 g of calcium metal is 1.710 moles
the no. of moles is given by :
The no. of mole = mass of the substance / mass of one mole
given values are :
mass of calcium ( Ca ) = 68.43 g
molar mass of calcium that is the mass of one mole of calcium = 40 g/mol
substituting the values,
number of moles = mass / molar mass
= 68.43 g / 40 g/mol
= 1.710 moles
number of moles calcium in 68.43g = 1.710 moles
Thus, The number of moles are in 68.43 g of calcium metal is 1.710 moles.
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When solving problems using dimensional analysis, the units cancel out diagonally from each other. T or F
The statement that when solving problems using dimensional analysis, the units cancel out diagonally from each other is TRUE.
What is dimensional analysis?Dimensional analysis can be referred to as the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.
The main idea in Dimensional Analysis is to be able to create a conversion ratio that has the units you want in the numerator and the units you already have in the denominator.
The statement that when solving problems using dimensional analysis, the units cancel out diagonally from each other is TRUE.
Dimensional analysis allows you to convert units by multiplying the old measurement by one (or more) forms of the number 1. While we know that the multiplication by 1 does not change the value of the measurement, it in effect does change the measurement's units.
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Complete the following acid-base reactions with balanced molecular, total ionic, and net ionic equations: A) Cesium hydroxide(aq)+ nitric acid(aq)
For the acid-base reaction between cesium hydroxide and nitric acid, the given equations are as follows:
Molecular equation: CsOH (aq) + HNO₃ (aq) --> CsNO₃ (aq) + H₂O (l)Total ionic equation : Cs⁺ (aq) OH⁻ (aq) + H⁺ (aq) NO₃⁻ (aq) --> Cs⁺ (aq) NO₃ (aq) + H₂O (l)Net ionic equation : OH⁻ (aq) + H⁺ (aq) --> H₂O (l)What are acid-base reactions?Acid-base reactions are reaction in which acids reacts with bases to form salt and water only.
Acid-base reactions are called neutralization reactions since the acid and base are both neutralized to a neutral substance, salt.
The equations in the acid-base reaction of Cesium hydroxide (aq) and nitric acid (aq) are described below:
The molecular equation shows all the reactants involved in the reaction as molecukemoleculesThe total ionic equation shows all the ions involved in the reactionNet ionic equation: shows only the ions that form a non-ionic product.Learn more about acid-base reactions at: https://brainly.com/question/9836972
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hello, can someone please help me with this problem
This reaction is exothermic reaction and amount of heat that was released or absorbed by the reaction is 208.8kJ and reaction enthalpy means ΔH is 705.91kJ/mol
An exothermic process releases heat causing the temperature of the immediate surroundings to rise
Here given reaction is
KOH → K⁺ + OH⁻
So, here given data is 14.4 gram of potassium hydroxide in 250 gram of water and the temperature of water rise from 20°C to 34.5°C and
We have to find which type of reaction is this =? and
Calculate heat released or absorbed by this reaction =? and
Calculate reaction of enthalpy ΔH = ?
So this reaction is exothermic because when potassium react with water it gives potassium hydroxide and in that potassium hydroxide the potassium is positive charge and OH has negative charge
Amount of heat released or absorbed by the reaction the formula are
q = m×c×ΔT and ΔT = 20°C - 34.5°C = 14.5°C and c = 0.452J/g°C
q = 14.4 gram×0.452×14.5°C
q = 94.377kJ
Reaction enthalpy means ΔH so,
ΔHreaction = m×s×ΔT
ΔHreaction = 14.4 gram×94.377kJ×14.5°C
ΔHreaction = 705.91kJ/mol
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What color is this? I think it’s blue or gray, but I’m color blind.
Answer:
BLACK
Explanation:
the color is black
Answer: 1st one is black second one is also black
Explanation:
look at the picture
high school
Answer:
determining the melting point of a substance
Explanation:
What are the first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate.
Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) is the first and Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq) is the second net ionic equations for the addition of aqueous ammonia to aluminum nitrate
The net ionic equation is the chemical equation that shows only those elements or compounds or ions that are directly involved in the chemical reaction
So, first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate are
Complete ionic equation is
Al₃(aq) + 3NO₃(aq) + 3NH₄⁻(aq) + 3OH⁻(aq) → Al(OH)₃ (s) + 3NH₄⁺(aq)+ NO₃⁻(aq)
So two net ionic equations are
Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)
Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq)
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If You Had Three Wishes, What Would You Wish For
Assuming you can't wish for infinite wishes:
1. Hyperintelligence
2. Elite athleticism (within the confines of human limitations of course. So just being a 99th percentile athlete)
3. The ability to summon a delicious steak of any variety at any level of doneness at any moments notice
Once started, why can nuclear fission continue to occur on its own? The thermal energy released can cause the products to join. The neutron formed by the reaction can cause more nuclei to combine. The thermal energy released can cause the products to split. A neutron begins the reaction, and more neutrons are formed in it.
Once started, nuclear fission reactions are able to continue to occur on their own because a neutron begins the reaction, and more neutrons are formed in it; option D
What is nuclear fission?Nuclear fission is a type of nuclear reaction in which the nucleus of atoms of large molecular mass is split into two or more smaller atomic nuclei.
Nuclear fission reactions result in the release of large amounts of heat energy and radiation.
Nuclear fission reactions once started, are able to go on occurring on their own until all fissionable material is used up. This is known as a chain reaction.
A chain reaction in nuclear fission occurs because when the atomic nucleus of the large atom is bombarded with fast-moving neutrons, the neutrons that are captured by the nucleus of the large atom results in the fission of the atom and the release of more neutrons that initiate more fission reactions.
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What is the formula for Ag ^+ and Na2S
The formula for Ag ^+ and Na2S is,
Net Ionic Equation
2Ag + Na2S = Ag2S + 2Na might be an ionic equation.
What exactly is a net ionic equation?The formula for Ag ^+ and Na2S is example of Net Ionic Equation. A net ionic equation is defined as an equation that depicts only the molecules or ions that are actively involved in the reaction or those that change. The spectator ions are not present in this equation. First, write and balance the molecular equation, ensuring that all formulas are correct. Then, using all aqueous substances as ions, write the ionic equation. Carry any coefficients through. Finally, remove spectator ions from the equation and write the net ionic equation. The objective of writing a chemical equation exists to communicate what we accept is proceeding in a chemical reaction. One of the most useful applications of the principal species concept is in the formulation of net ionic equations.To learn more about Net Ionic Equation, refer to:
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using the molar ratio between the limiting reactant (aluminum) and the product copper determine the theoretical yield of copper
Using the molar ratio of the limiting reactant to the product, the theoretical yield of copper would be 192 grams.
What are limiting reactants?In chemical reactions, limiting reactants are reactants that limit the extent of reactions due to their limited quantities as compared to other reactants.
Thus, limiting reactant dictates the amount of product that is formed from reactions.
Considering the reaction:
[tex]3CuCl_2 + 2Al = 2AlCl_3 + 3Cu[/tex]
Aluminum being the limiting reactant has 2 moles. The copper, being the product has 3 moles. Thus, the mole ratio between the limiting reactant and the product is 2:3.
This means that for every 1 mole of aluminum that reacts, 1.5 moles of copper is produced.
3 moles of copper are produced from the reaction.
Recall that: mass = mole x molar mass
Molar weight of copper = 64 g/mol
Mass of 3 moles copper = 3 x 64
= 192 grams
The theoretical yield of copper is, therefore, 192 grams.
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The number of moles of MgO produced when 0.20 mole of O2 reacts completely is
The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is 0.40 mole
Mole is the SI unit of amount of substance of a specified elementary entity
Here given data is number of moles of MgO produced when 0.20 mole of O₂ reacts we have to find mole = ?
So the balanced equation is
2Mg + O₂ → 2MgO
So, the number of moles of MgO = (0.20 mol of O₂ )×(2 mol of MgO) / (1 mol of O₂)
= 0.40 mole
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Is distilled water act as preservative?
Marisa is read her Miranda rights. Why is this important?
A.
She can secure an attorney if she wants one.
B.
She knows she is not in formal police custody.
C.
She is required to testify for the defense in her trial.
D.
She is aware she is being video recorded at all times.
The Miranda rights are very important because she can secure an attorney if she wants one. That is option A.
What is Miranda right?The Miranda rights are the rights that an individual has when involved with a criminal procedure to help protect them when in police custody.
The Miranda rights where created in the United States of America in the year 1966 which occurred as a result of case of Miranda v. Arizona.
These Miranda rights are used or initiated only when the suspect is to be interrogated under custody and not merely when arrested.
It lets the individual know that they can secure an attorney if they want one.
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Answer: A
Explanation:
Eris is round an orbits the sun. it is slightly smaller than the planet Mercury. Yet, Eris is classified as a dawrf planet. Why?
Eris is round an orbits the sun, it is slightly smaller than the planet Mercury. Yet, Eris is classified as a dwarf planet because Eris is a plutoid. It is a trans-Neptunian dwarf planet. It is the most distant dwarf planet which is located beyond the orbit of the Neptune.
The orbital characteristics of Eris are more specifically categorized as a scattered disk object. It has been scattered into more-distant and unusual orbits which follows the gravitational interactions with the Neptune as the solar system was forming.
Eris was discovered in 2005 and was classified as the planet. It is a celestial body that orbits the sun, and has enough mass to be round in shape. It has not cleared neighborhood around its orbit as it is a dwarf planet.
Eris is classified as a plutoid because it is farthest from the sun than Neptune. It is massive enough to be pulled into a spherical shape but not as massive as eight planets of solar system.
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Asteroids are left over pieces of rocks that didn't become planets or satellites. Where are most of these located in the Solar System?
A. The Oort Cloud
B. The Kuiper Belt
C. The Asteroid Belt
Asteroids are left over pieces of rocks that didn't become planets or satellites. These are mostly located in The Asteroid Belt in the Solar System.
The main asteroid belt is a region between the orbits of Mars and Jupiter. The Asteroid Belt is a torus shaped region. Some of the asteroids may go in the front or behind the Jupiter.
The Oort cloud has around 2.3% of left over pieces of asteroid rocks. It is a predicted percentage.The asteroids were located in more amount earlier when the interplanetary zones were clearing in the solar system.
The Kuiper Belt has bits of rocks, comets, ice, and the dwarf planets. It is similar to the asteroid belt but it is more complex and larger.
Asteroids are discovered by a systematic search for a planet between Mars and Jupiter in the asteroid belt.
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Draw the net force arrow on the diagram and state the direction. Net force direction
The Net force which is acting on the object is 20.12 N and the direction (θ) of the net force is 26.56° towards the South of East. The net force is a resultant of both the forces.
What is the net force?Th net force is the vector sum of all the forces which are acting on a particle or object. The force on the object in the diagram is given below as follows:
Force 1, F₁ = 18 N (force acting in a direction to the east)
Force 2, F₂ = 9 N (force acting in a direction south)
The two forces makes the two sides of a right-angled triangle in the diagram:
Net force can be determined using Pythagoras rule as follows:
Net force, F = √[(F₁)² + (F₂)²]
Net force = √ [(18)² + (9)²]
Net force = √ (324 + 81)
Net force = √ 405
Net force = 20.12 N
The direction of the Net force (θ) is determined as follows:
θ = tan⁻¹ (9 / 18)
θ = tan⁻¹ (0.5)
θ = 26.56° towards South of East
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If 30.0 grams of sulfur dioxide and 8.4 grams of water combine to form sulfurous acid (H_2_SO_3_), how many grams of sulfurous acid (H_2_SO_3_) must form?
When 30.0 grams of sulfur dioxide and 8.4 grams of water combine then 38.27 grams of sulfurous acid (H₂SO₃) must form.
What is a limiting reagent?A limiting reagent is a reactant that is entirely consumed in the chemical reaction from the reaction mixture and indicates the completion of the reaction and is known as a limiting reactant.
The limiting reagent will decide the maximum quantity of product when reactants will not take in stoichiometric quantities.
Given, the chemical reaction of the formation of sulfurous acid:
SO₂ (g) + H₂O (l) → H₂SO₃ (l)
The molecular mass of the sulfur dioxide, water, and sulfurous acid is 64, 18, and 82g/mol respectively.
Given, the amount of sulfur dioxide, and water is 30 g and 8.4 g respectively.
If 18 grams of water react with sulfur dioxide = 64 g
Then 8.4 g of water reacts with sulfur dioxide = (64/18)×8.4 = 29.86 g
So, water is the limiting reagent in this reaction, which will decide the amount of sulfurous acid.
If 18 grams of water formed sulfurous acid = 82 g
Then 8.4 g of water will form sulfurous acid. = (82/18)×8.4 = 38.27 g
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Help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Answer:
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Explanation:
Not really sure what the problem is, the answer is given in the question.
The question asks "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
The first part of the question is "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
The second part of the question is literally the answer, "Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
it could be that you just accidentally pasted the same thing twice, and the original question was just "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
In that case, remember that the order of greenhouse gas potency is Carbon dioxide, methane, nitrous oxides, chlorofluorocarbons. Thus, nitrous oxide and methane are both more potent than carbon dioxide.
A rubber object that floats in water weighs 9.0 x 10-2 N. What is the weight of the water it displaces?
Weight of water displaces is 9.0 × [tex]10^{-2}[/tex] kg.
By the help of Archimedes’ principle,
F = weight of water displaces
Given, F = 9.0 × [tex]10^{-2}[/tex] N
Hence, weight of water displaces is 9.0 × [tex]10^{-2}[/tex] kg.
Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force same to the load of the displaced fluid. this is a first circumstance of equilibrium. We recall that the above force, referred to as pressure of buoyancy, is located in the center of the submerged hull that we name center of buoyancy.
He did supposedly get an concept as he sat down in a bath, but it wasn't approximately buoyancy that is the phenomenon on which his principle is based. Archimedes' principle states that any object, completely or in part immersed in a fluid, is buoyed up via a force equal to the burden of the fluid displaced through the object.
It is utilized in designing of ships and submarines. It is used in lactometers to determine the purity of milk. it is used in hydrometers to decide density of fluids. It is used in hydraulic lifts.
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Isopropyl alcohol is mixed with water to produce a solution that is 70% alcohol by volume. How many mL of each compound is present in 785 mL of this solution?
Answer:
x = 549.5ml
Explanation:
As per the given data,
Volume of alcohol = 70% (v/v) = 70 ml in 100ml solution
Volume of the compound present = 785ml
From the above given values,
x ml solute/785 = 70/100
x ml solute = 70*785/100
x = 549.5ml
therefore, the volume of solute is 549.5ml.
date:09-10-2022
emmissions generated by a coal powered utility
Answer:
Explanation:
Coal is a cheap and abundant resource, and carbon dioxide (CO2) from coal use is responsible for about 40 percent of global greenhouse gas (GHG) emissions from fossil fuel use.
Use this reaction to answer the questions and explain :
CO(g)+2H2(g)-CH3OH(g) DeltaH= -91.8kJ
1- if the temperature of the system increases , will the value of the equilibrium constant k increase, decrease or stay the same?
2- Will the concentration of H2 increase, decrease or stay the same ?
1) If the temperature of the system increases, the equilibrium constant k decreases.
2) the concentration of H₂ increases.
The reaction is given as :
CO + 2H₂ ⇄ CH₃OH ΔH = -91.8 KJ ( exothermic reaction)
1) Temperature is the only factor that changes the equilibrium constant for the given reaction. As temperature increases equilibrium constant decreases because the reaction is exothermic reaction.
K = [ CH₃OH ] / [CO] [H₂]²
2) If the temperature increases the position of equilibrium moves to the left and concentration of H₂ increases.
Thus, 1) If the temperature of the system increases, the equilibrium constant k decreases.
2) the concentration of H₂ increases.
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What is the molality of an aqueous solution made with 5.00 kg of water and 3.6 mol of solute?
0.72 m NaOH
3.6 m NaOH
0.090 m NaOH
1.4 m NaOH
The molarity of the aqueous solution is determined as 0.72 M NaOH.
What is molarity?
Molarity is used to express the concentration of a solution. It is described as the number of moles of a solute in a given concentration of a solution.
Mathematically, molarity is given as;
M = n/V
where;
n is the number of moles of the soluteM is the concentration of the solutionV is the volume of the solutionThe volume of the water is calculated as follows;
volume = mass / density
volume = (5 kg) / (1000 kg/m³)
volume = 0.005 m³
The volume of the water in liters is calculated as follows;
volume = 0.005 m³ = 5 liters
The given parameters;
number of moles of the solute = 3.6 moles
Molarity = 3.6 moles / 5 L
molarity = 0.72 M
Thus, the molarity of the aqueous solution of sodium hydroxide is determined from the ratio of number of moles to the volume of the solution.
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12.60 mg KI in 109.9 mL of solution
Answer: Molarity (M) = 6.897 x 10-4 (exponent)
Explanation: Atomic weight of KI is 166.028
12.6 mg = 0.126g/ 166.028 = 7.58 x 10-5 mol
Molarity (M) = concentration
M = moles(n)/Volume (in liters)
M= 7.58 x 10-5 mol/0.1099L = .0006897 M = 6.897 x 10-4 (exponent)
The following chemical reaction takes place in aqueous solution:
FeCl₂(aq)+K₂S(aq) → FeS(s)+2 KCl(aq)
Write the net ionic equation for this reaction.
Answer: Fe(aq) + S(aq) yields FeS(s)
Explanation:
Fe+2 + 2Cl- + 2K+ + S-2 yields FeS(S) + 2K+ + 2Cl-
Cross out the aqueous ions and you are left with
Fe+2 + S-2 yields FeS(s).
In a reaction of 3-ethyl-2-pentene with HBr as an electrophilic addition reaction, predict the major and minor products (if there is a
difference). Justify your answer by providing the carbocation intermediates for all products. You may arbitrarily choose which
product is product #1 and which is product #2. You will determine major and minor (if any) in the questions below the box.
Intermediates
Products after reacting with HBr
().
Structure of Starting Reactant:
3-ethyl-2-pentene
(you may choose the stereo configuration)
Intermediate option #1
Intermediate option #2
Product from Intermediate #1
Product from Intermediate #2
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Donna wants to calculate the speed at which a sound wave is traveling. She knows that the frequency of the wave is 680 hertz and that the wave has a wavelength of 0.5 meters.
What is the speed of the sound wave?
The speed of the sound wave is 340 mrter per second.
f = frequency of sound wave = 680 hertz
λ = wavelength of sound wave = 0.5 meter
v = speed of the sound wave
We know that the velocity of a sound wave is given by
speed of sound wave = frequency wave of sound x wavelength of sound wave
v = f λ
Substituting the above values into the above equation
v = (680 hertz) (0.5 meters)
v = 340 meters per second
Therefore the speed of sound waves is 340 meters per second.
Sound waves are pressure waves. They can be seen as pressure fluctuations over time. Sound waves are transverse waves. To hear the sound of a tuning fork, the tines on the fork must move air from the fork to the ear. Most sound waves are produced by vibrating objects. Sound is a kind of energy produced by vibration.
These vibrations create sound waves that travel through media such as air water, and wood. When an object vibrates it creates motion in the particles of the medium.
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can you guys help me figure this out? im failing right now
Answer:yes
Explanation: Because i can help u
What volume (in mL) of 0.2950 M HCI is required to neutralize 75.00
mL of 0.6000 M LIOH?
203 mL of 0.2950 M HCI is required to neutralize 75.00 mL of 0.6000 mL NaOH.
Hcl + NaOH [tex]\rightarrow[/tex] Nacl + H2O
Form dilution formula:
M1V1=M2V2.
So M1=0.6000M, V1=0.075L, M2=0.2950M HCl, V2=?
V2 = M1V1/M2
= (0.8)(0.075)/0.2950
=0.2033L=203 mL.
Explain Dilution ?Dilution is the process of "lowering the concentration of a solute in a solution simply by adding more solvent, such as water, to the solution." Diluting a solution requires adding a solvent without adding a solute.
A popular way to make a solution of a given concentration is to take a higher concentration and add water until the required concentration is reached. Dilution is the term for this procedure. Dilution can also be done by mixing a higher concentration solution with a lower concentration. Since stock solutions are often obtained and stored in very concentrated concentrations, dilution of the solutions is a mandatory procedure in the laboratory.
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