A method for determining the quantity of dissolved oxygen in natural waters requires a series of redox reactions. Balance the following chemical equations in that series under the conditions indicated (and include phases):

a. in basic solution
Mn^(2+) (aq) + O2 (g) ---> MnO2 (s)
b. in acidic solution
MnO2 (s) + I^(-) (aq) ---> Mn^(2+) (aq) + I2 (s)
c. in neutral solution
I2 (s) + S2O3^(2-) (aq) ---> I^(-) (aq) + S4O6^(2-) (aq)

Answers

Answer 1

Balance the following equation:

in basic solution: Mn²⁺ (aq) + O₂ (g) + 4OH⁻(aq) → MnO₂ (s) + 2H₂O (l)in acidic solution: MnO₂ (s) + I⁻ (aq) + 4H ⁺ → Mn²⁺ (aq) + I₂ (s) + 2H₂O (l)in neutral solution: I₂ (s) + 2S₂O₃²⁻(aq) → 2I⁻ (aq) + S₄O₆²⁻ (aq)

A chemical equation is a symbolic writing of a chemical reaction. The chemical formulas of the reactants are written to the left of the equation and the chemical formulas of the products are written to the right

In basic solution:

Step-1: The number of Mn and O atoms on both sides is checked. They are equal.Step-2: The charges are looked in. The left-hand side (LHS) has net 2+ on Mn the Right-hand side (RHS) has a net O charge. Since it is a basic reaction, we neutralize the charge on Mn2+ (LHS) by adding 2 negative charges ie, 2 OH⁻ ion ⇒ Mn²⁺ + O₂+ 2OH⁻ → MnO₂Step-3: The newly introduced H on LHS is balanced on RHS by inserting a respective number of water molecules. ⇒ Mn²⁺ + O₂ + 4OH⁻ → MnO₂ + 2H₂O.Step-4: Toy to balance the number of O, H, and then Mn. ⇒ Mn²⁺ (aq) + O₂ (g) + 4OH⁻(aq) → MnO₂ (s) + 2H₂O (l)

In acidic solution:

Step-1:  Balance number of atoms: (O by adding H₂O)Step-2: Balance the charges by adding protons and electronsStep-3: Combine LHS and R.H.S of both equations Canal out electrons. ⇒ MnO₂ (s) + I⁻ (aq) + 4H ⁺ → Mn²⁺ (aq) + I₂ (s) + 2H₂O (l)

in neutral solution:

It doesn't involve any proton or hydroxide ion in the reaction. There is no 2S₂O₃²⁻ ion and S₄O₆²⁻, the correct form is S₂O₃²⁻ and S₄O₆²⁻. This reaction comes in the third series of the Winkler method of determining Dissolved Oxygen.

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Related Questions

why is pluto classified as a dwarf planet?

Answers

Answer:

pluto is considered a dwarf planet because it did not meet the three criteria the IAU uses to define a full sized planet

Explanation:

What is the mass of an object with a net force of 10 N accelerating at 2 m/s^2??

Answers

Answer:

5kg

Explanation:

Force = Mass x acceleration

F = ma

m = F/a = 10N/2m/s^2

m = 10/2 = 5kg

The standard unit for mass = Kilogram

Calculate the answer. Express it in scientific notation. All answers should have the correct number of significant figures.
(1.632) (4.0 x 104) =

Answers

(1.632) (4.0 x 104)

= (1.632)(416)

=678.912

6.8* 10^2.

Not sure if it's the right sig figs.

Answer:

417.632 (i dont know if u need to round or somehting but this is what i think is right)

Explanation:

4.0 x 104 = 416

(1.632) (416) = 417.632

If you have 12 atoms of hydrogen before a chemical reaction, how many atoms of hydrogen will be present after the chemical reaction?

Answers

12 because they just don’t disappear I forgot what the rule is called tho

Answer:

it is 12

Explanation:

because matter can put be created or destroyed

number of elments in hcooh

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3 elements are present in HCOOH - hydrogen, oxygen, and carbon.

TRUE or FALSE: Traits that an organism has can be influenced by factors in the environment.

Answers

Answer:

True

Explanation:

Hope this helps

true. hope this helps have a good day

what element has 5 protons, 7 electrons, and 6 neutrons

Answers

Answer:  Boron

Explanation: lol

Answer:

Boron. (What kind of name is that?????????????)

Explanation:

Can somebody help me pls pls pls pls pls

Answers

Answer:

1.5e + 24 I think, hope this can help

H2CO: → H2O + CO2
Answer the following question about the equation above.
1. How many atoms of Hydrogen are in the reactant?
2. How many atoms of Carbon are in the reactant?
3. How many atoms of Oxygen are in the reactant?
4. How many atoms of Hydrogen are in the product?
5. How many atoms of Oxygen are in the product?
6. How many atoms of Carbon are in the product?
7. Does the number of atoms of each element on the reactant side match that of the product side?

Answers

Answer:

1) 2

2) 1

3)1

4) 2

5)3

6)1

7)yes except Oxygen

7. Given the balanced equation:


As a sample of I2(s) sublimes to I2(g), the entropy of the sample

Answers

Gas molecules have more freedom in motion—and gases can be thought of as more “disordered”—than molecules of a solid, which are rigidly held in place. When it comes to phases, the entropy increases as you go from a solid to liquid to gas (the gaseous state having the greatest entropy and the solid state having the least).

So, as a sample of solid iodine sublimes to form gaseous iodine, the entropy of the sample increases.

How much energy is used to heat 250 g of ice from –15°C to steam at 105°C? (Hint: 5 steps, all positive)

Answers

Answer:

Explanation: Q1 = mc(ice) ΔT (ice warms)

Q2 = ms (ice melts)

Q3 = mc((water) ΔT (water warms)

Q4 = mr (water boils)

Q5 = mc(vapour)ΔT

A material in which electrons are able to move easily or freely is a(n)
A none of these
В electric field
C insulator
D conductor​

Answers

Answer:b

Explanation:

which star is mostly like Earth's sun? A)Blue Giant B) Red Giant C) Main sequence D) White Dwarf?​

Answers

Answer:

C) main sequence

Explanation:

Currently, the Sun is a main sequence star. In roughly 5 billion years from now, the Sun will transition into a red giant.


Based on this diagram, which type of stars would belong to spectral class M and have the
highest luminosity?

Answers

Answer:J , the answer is super giants

does the mercury not have fixed shape and volume at 20 degree

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Answer:

Mercury doesn't have a fixed shape

4. Calculate the heat energy needed to heat 25.0 g of water from 13.0°C to 18.0°C. Use chart above for specific heat of water. Use units and show all work.​

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Answer: I go search some information

Explanation:I come back with a answer

Examine the structure of glucose and galactose which oh group determines that they both are the d isomers

Answers

Answer:

See Explanation

Explanation:

Stereoisomers are isomers that have the same atom to atom connectivity but differ in the arrangement of atoms or groups in space.

Glucose and galactose are stereoisomers that have more than one stereogenic center but differ in the configuration of atoms and groups about one of the stereogenic centers. This kind of stereoisomers are also called epimers.

Glucose and galactose differ in the orientation of -H and -OH at carbon-4.

state ay three ways of increasing solubility

Answers

Increasing temperature
Pressure
Molecular size
Speed of stirring

what happens when a species is moved from its natural environment?

Answers

When a species is moved from its natural habitat it will learn to adapt to the new environment

Answer:

What may happen is everything where they used to live may change. Like The food cycle or the ecosystem. Here's a example. We took wolves from their natural environment and there was a big impact on what they did. Elks is what they ate all the time and kept their population low enough to where the environment can thrive but when they took the wolves the elks started to eat the berries in which Grizzly Bears need to feast on for their hibernation and they ate shrubs and other plant like stuff to which stuff couldn't grow anymore. The Elk population when from 5000 to 30000 from when they took the wolves that day. Another thing is how beavers build dams to keep water from going to certain places which help humans out too, but all the time the Elks would drink water and leave waste inside the water to where fish and other species inside the water started dying out. So beavers couldn't build. So this is my example of what may happen if a species is moved from their natural ground cause they could also ruin a food chain somewhere else.

Explanation:

Hope this helps

What volume, in liters, of 0.500 M HNO3 is necessary to react with 25.0 mL of 0.0500 M Ca(OH)2 solution to the endpoint? HNO3 + Ca(OH)2. --> Ca(NO3)2 + H2O

Answers

Answer:

0.00500L are necessaries

Explanation:

Based on the balanced chemical reaction:

2HNO3 + Ca(OH)2. --> Ca(NO3)2 + 2H2O

2 moles of nitric acid react with 1 mole of calcium hydroxide

To solve this question we must find the moles of Ca(OH)2. Then, convert this moles to moles of HNO3 using the chemical reaction and to liters:

Moles Ca(OH)2:

0.025L * (0.0500mol / L) = 0.00125 moles Ca(OH)2

Moles HNO3:

0.00125 moles Ca(OH)2 * (2 moles HNO3 / 1mol Ca(OH)2) = 0.0025 moles HNO3

Liters HNO3:

0.0025 moles HNO3 * (1L / 0.500moles) = 0.00500L are necessaries

in an electroplating apparatus, where does the oxidation reaction occur?

a. on the surface of the battery

b. on the surface of the cathode

c. in the solution

d. on the surface of the anode

Answers

Answer:

I believe it’s on the surface of the anode!

Explanation:

Electroplating apparatuses are the devices used in the electroplating of metals. The oxidation reaction occurs on the anode of the plate. Thus, option d is correct.

What is oxidation?

Oxidation is the process of the redox reaction in which the atoms or the ions lose their electron to the positive anode. The negative of the ionic species gets attracted to the positive of the anode.

The negative ions act as charges deposited on the positively charged anode and conduct electric current. The oxidation of the species will always occur at the anode of the electrochemical cell.

Therefore, option d. oxidation occurs at the surface of the anode.

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Magnetic poles are called domains.
True
False

Answers

Answer:

false

Explanation:

the magnetic domains in the area around a magnet where the force acts.

6th grade science Major grade plz help ASAP

Answers

Answer: An organism is part of a community

During
the
school
year,
1.3
x
102
students
participate
in
football,
and
.5
x
102
participate
in
soccer.

What
is
the
total
number
of
students
that
participate
in
football

Answers

If I understood question correctly,
football 1.3 • 102=132.6
Answer is 132 students participate in football.

Overflow during a heavy rainstorm from a wastewater treatment plant would result in

A. polluted runoff into nearby ponds.
B. flooding in the local aquifer.
C. weakened housing foundations.
D. over-treated drinking water.

Answers

Answer: a.polluted runoff into nearby ponds

Explanation:

Answer:

Aa

Explanation:



If a sample of oxygen gas has a pressure of 810 torr at 298 K, what will be its
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Answers

Answer:

The pressure is = 897 torr

Explanation:

Which statement describes sunspots? A.Sunspots have a bright white appearance. B.Sunspots occur in the radiative zone of the sun. C.Sunspots occur in areas of extremely low magnetic fields. D.Sunspots have lower temperatures than their surroundings.

Answers

Answer:

The statements that describe sunspots is;

D. Sunspots have lower temperatures than their surroundings

Explanation:

Sunspots is a phenomenon that involves temporary appearance of dark areas on the Sun's surface, which are regions of concentrated magnetic field flux which inhibit heat transfer by convection and are therefore cooler than other parts of the Sun. Due to the presence of magnetic field magnetic  

Sunspots are temporary phenomena on the Sun's photosphere that appear as spots darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic field flux that inhibit convection. Opposite magnetic polarity sunspots usually appear as a pair.

Therefore, the statement that best describe sunspots is that a sunspot is a region of reduced temperature compared to surrounding areas on the Sun's surface.

How do i describe endothermic and exothermic changes in matter?

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I hope this helps you with your problem !!!!!


Balance the following chemical equation:
C2H60+02 → CO2 + H2O

Answers

Answer: C2h6O + 3O2 → 2CO2 + 3H2O

Explanation:

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Answers

answer: the earth orbits around the sun for 365 while getting older to the young theory.

Answer:

The older theory was that the sun (and other planets) revolved around earth and the new theory is that the earth (and other planets) revolved around the sun.

Explanation:

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