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Fudgin [204]
3 years ago
13

For a particular redox reaction ClO2– is oxidized to ClO4– and Fe3 is reduced to Fe2 . Complete and balance the equation for thi

s reaction in basic solution. Phases are optional.
Please HELP, I don't know how to balance redox reactions in basic solutions...!
Chemistry
1 answer:
creativ13 [48]3 years ago
8 0
We have to balance the equation in basic medium:
ClO₂⁻ → ClO₄⁻
Chlorine atoms are balanced 
we will balance oxygen atoms by adding water to the side with less oxygen
2 H₂O + ClO₂⁻ → ClO₄⁻
Now balance hydrogens by adding H⁺ first
2 H₂O + ClO₂⁻ → 4 H⁺ + ClO₄⁻
The charge will be balanced by adding electrons to side where positive charge is more
2 H₂O + ClO₂⁻ →  4 e + 4 H⁺ + ClO₄⁻
Now balance H⁺ by adding same number of OH⁻ in both sides
2 H₂O + ClO₂⁻ + 4OH⁻ →  4 e + 4 H⁺ + 4OH⁻ + ClO₄⁻
H⁺ will neutralize OH⁻ to give water
2 H₂O + ClO₂⁻ + 4 OH⁻ → 4 e + 4 H₂O + ClO₄⁻
Balanced half reaction will be:
ClO₂⁻ + 4 OH⁻ → 4 e + 2 H₂O + ClO₄⁻ → (1)
Now balance the second half (reduction):
Fe⁺³ → Fe⁺²
Balance charge by adding electrons:
e + Fe⁺³ → Fe⁺² → (2) Multiply by 4 and add the two equations to get:
ClO₂⁻ + 4 OH⁻ + 4 Fe⁺³  → 4 Fe⁺² + 2 H₂O + ClO₄⁻
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Nookie1986 [14]

The concentration of the HCl solution is 0.72 M.

<h3>How do we calculate the concentration?</h3>

Concentration of the required solution by the use of the known concentration solution will be determine by using the below equation as:

M₁V₁ = M₂V₂, where

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On putting values in the above equation, we get

M₁ = (1)(0.018) / (0.025) = 0.72 M

Hence required concentration of HCl is 0.72M.

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goldfiish [28.3K]

Answer:

8. the answer is B.

9. the answer is A.

Explanation:

Hello!

8. In this case, by bearing to mind that the limiting reactant is always completely consumed and the excess one remain as a leftover at the end of the reaction, we can also infer that as all the limiting reactant is consumed, it must determine the maximum amount of product as the excess reactant will hypothetically produce a greater mass than expected; thus, the answer to this question is B.

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