Question

pH of 0.01 M ammonium cyanide solution is 7.02. If 5 litres of water is added to this solution, the pH becomes -

• A. $>$ 7.02
• B. $<$ 7.02
• C. 7.02
• D. Can't be predicted

Answer 1

Answer: (C)

7.02

Here, as the solution is almost neutral so by adding 5 lit water the solution will remain neutral with same pH. Now, as ammonium cyanide is weak acid - weak base salt, the pH of the solution will be 7.02.