Chapter 14, Problem 32CI

In the kidneys, the ammonia buffer system buffers high $H_3{O}^{+}$ . Ammonia, which is produced in renal tubules from amino acids, combines with H' to be excreted as ${\text{NH}}_{\text{4}}\text{Cl}$ . At body temperature (37°C), the $K_a=5.6\times {10}^{-10}$ . A buffer solution with a volume of 125 mL contains 3.34 g of ${\text{NH}}_{\text{4}}\text{Cl}$ and 0.0151 g of ${\text{NH}}_{\text{3}}$ . (7.2.7J, 8.4. 14.9)

$N{H}_4^{+}\left(aq\right)+H_{2}O\left(l\right)\stackrel{}{\rightleftarrows }N{H}_3\left(aq\right)+H_3{O}^{+}\left(aq\right)$

1. What is the $\left[N{H}_4^{+}\right]$?
2. What is the $\left[N{H}_3\right]$?
3. What is the $\left[H_3{O}^{+}\right]$?
4. What is the pH of the buffer?
5. Write a balanced chemical equation that shows how this buffer neutralizes added acid.
6. Write a balanced chemical equation that shows how this buffer neutralizes added base.