Concept explainers
Consider the reduction of nitrate ion in acidic solution to nitrogen oxide
Interpretation:
The voltage of a cell involved in the given reaction needs to be determined.
Concept introduction:
Nernst equation is written as follows:
Here, R represents gas constant, T represents temperature, n represents number of electron, F represents Faraday’s constant,
Answer to Problem 61QAP
Voltage of a cell involved in the given reaction is
Explanation of Solution
Balance the reaction as follows:
Consider oxidation and reduction reaction separately as given below.
Reduction:
Oxidation:
Atom balance as follows:
One nitrogen each side no adjustment is required.
Total oxidation number-
Add electrons: Oxidation number for N goes from +5 to +2. It is reduced by 3. Add three electrons to reactant side.
Balance charge: reactants
Products: 0, in acidic medium add
Balance hydrogen atom:
Reactant contains 4 H and product contains 0 H. To balance add
Balance reaction is as follows:
Atom balance as follows:
One sulphur each side no adjustment is required.
Total oxidation number-
Add electrons: Oxidation number for S increases from +4 to +6. It is increased by 2. Add two electrons to product side.
Balance charge: Products
In acidic medium add
Balance hydrogen atom:
Reactant contains 0 H and product contains 4 H. To balance add
Balance reaction is as follows:
Multiply equation (1) by 2 and equation (2) by 3 and add the resulting equation.
Calculate
Given,
Calculate
Calculate reaction quotient for balance reaction (equation 3) as follows:
Given, pressure of all gases is
Use Nernst equation to calculate cell potential is as follows:
Nernst equation is given below.
Here, R represents gas constant, T represents temperature, n represents number of electron, F represents Faraday’s constant,
Therefore, voltage of a cell involved in the given reaction is
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Chapter 21 Solutions
EBK CHEMISTRY: PRINCIPLES AND REACTIONS
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