When a solution of nickel(II) sulfate adjusted to a pH of 7 is electrolyzed. the

Question

When a solution of nickel(II) sulfate adjusted to a pH of 7 is electrolyzed. the green color of the solution becomes less intense in the cathodic chamber and gas bubbles are detected in the anodic chamber. (i) Write a balanced equation for the half-reaction occurring at the anode. (ii) Write a balanced equation for the half-reaction occurring at the cathode. Data for the experimental determination of Avogadro's Number and the Faraday Constant are recorded for Trial 1 (Sec Report Sheet.) in the table. Complete the analysis for those determinations. Record the calculated values with the correct number of significant figures.

Explanation / Answer

(5) SInce at cathode, the green color becomes less intensic, it indcates that NI2+ ions getting reduced here where as at anode gas bubbles are coming, indicating the liberation of O2 gas.

(i)

Anode Half Reaction:

2H2O (l) ----------> O2 + 4H+ (aq.) + 4e

(ii)

Cathode Half Reaction

Ni2+ (aq.) (+ 2 e --------------> Ni (s)

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