Answer to Question #93933 in Physical Chemistry for Abhishek

Question

Addition of NH4C1 to an aqueous solution of
NH4OH results in a decrease of pH. Explain.

Answer 1

Solution.

The ammonia solution NH4OH is a weak base, therefore the pH is greater than 7. As for the ammonium chloride solution NH4Cl, it is a salt formed by a weak base and strong acid, therefore the pH of this solution is less than 7. When ammonium chloride solution is added to the ammonia solution, the pH will decrease to balance the pH of the system.

Answer:

The ammonia solution NH4OH is a weak base, therefore the pH is greater than 7. As for the ammonium chloride solution NH4Cl, it is a salt formed by a weak base and strong acid, therefore the pH of this solution is less than 7. When ammonium chloride solution is added to the ammonia solution, the pH will decrease to balance the pH of the system.