## Chemistry and Chemical Reactivity (9th Edition)

(a) Ammonium chloride: $N{H_4}Cl$; - $N{H_4}^+$ is an acid, and $Cl^-$ doesn't affect the pH. When you add an acid to a solution, its pH is going to decrease, because the solution will get more acidic. (b) Sodium acetate: $NaCH_3COO$; - $Na^+$ doesn't affect the pH, and $CH_3COO^-$ is a base. When you add a base to a solution, its pH is going to increase, because the solution will get more basic. (c) $Na^+$ doesn't affect the pH, and $Cl^-$ also doesn't. Therefore, the pH will not change.