6. The compound Nal dissolves in pure water. Some of the information in the tabl

Question

6. The compound Nal dissolves in pure water. Some of the information in the table of standard reduction potentials given below may be useful in answering the questions that follow Half-reaction E° (V) 02(8) + 4 H+42 H,001.23 0.53 2 H20) + H(g)+ 20H0.83 Na tNa(s) -2.7 An electric current is applied to a 1.0 M Nal solution. (i) Write the balanced oxidation half-reaction for the reaction that takes place (i) Write the balanced reduction half-reaction for the reaction that takes place. (iii) Which reaction takes place at the anode, the oxidation reaction or the reduction reaction? (iv) All electrolysis reactions have the same sign for AG°. Is the sign positive or negative? Justify your answer

Explanation / Answer

(i)

Oxidation Half Reaction:

2 I- (aq.) ----------> I2 (s) + 2 e-

Reduction Half Reaction :

2 H2O (l) + 2 e- ---------> H2 (g) + 2 OH- (aq.)

(ii)
Overall reaction :

2 I- (aq.) + 2 H2O (l) ----------> I2 (s) + H2 (g) + 2 OH- (aq.)

(iii)

At anode oxidation reaction takes place

At cathode reduction reaction takes place

(iv) All electrolysis reactions are non spontaneous and hence have positve sign for deltaG0.

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