Chapter 8, Problem 37E

Calculate the number of moles of $\text{HCl}\left(g\right)$ that must be added to $\text{1}\text{.0 L of }1.0M{\text{ NaC}}_2{\text{H}}_3{\text{O}}_2$ to produce a solution buffered at each $\text{pH}\text{.}$

a. $\text{pH}=\text{p}{K}_{\text{a}}$

b. $\text{pH }=4.20$

c. $\text{pH }=5.00$