A buffer solution is prepared by adding 0.125 mol of ammonium chloride to 5.00 10 2

Question:

A buffer solution is prepared by adding 0.125 mol of ammonium chloride to 5.00 × 10² mL of 0.500 M solution of ammonia.
(a) What is the pH of the buffer?
(b) If 0.0100 mol of HCl gas is bubbled into 5.00 × 10² mL of the buffer, what is the new pH of the solution?

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