A volume of 100 ml of a buffer of 1 M – NH3 and 1 M – NH4^+ is placed in two half-cells connected by a salt bridge. A current of 1.5 A is passed through the cell for 20 min. If electrolysis of water t

Question

A volume of 100 ml of a buffer of 1 M – NH3 and 1 M – NH4^+ is placed in two half-cells connected by a salt bridge. A current of 1.5 A is passed through the cell for 20 min. If electrolysis of water takes place only and the electrode reactions are: Right: 2H2O + O2 + 4e^– -> 4 OH^– and Left: 2H2O -> 4H^+ + O2 + 4e^–, then, the pH of the

Prashant Kotian · Accepted Answer

Correct answer: A. At the right electrode (cathode), OH^- is produced, which reacts with NH4^+ to form NH3. This increases the ratio of [NH3]/[NH4^+], causing the pH to increase. At the left electrode (anode), H^+ is produced, which reacts with NH3 to form NH4^+, decreasing the pH. Thus, the pH of the right electrode increases. Therefore, correct answer is A.

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