Chapter 16, Problem 39PE

A buffer is prepared by mixing $\text{50}{\text{.0 g of NH}}_{\text{3}}\text{ and 50}{\text{.0 g of NH}}_{\text{4}}\text{ Cl in 0}\text{.500 L}$ of solution. What b the pH of this buffer, and what will the $\text{pH}$ change to if 5.00 g of HCl is then added to the mixture?