Chapter 16, Problem 16.41CP

The following pictures represent initial concentrations in solutions that contain a weak acid HA ( ${\text{pK}}_{\text{a}}$ = 6.0) and its sodiumsalt NaA. ( ${\text{Na}}^{+}$ ions and solvent water molecules have been omitted for clarity)

(a) Which solution has the highest pH? Which has the lowest pH?

(b) Draw a picture that represents the equilibrium state of solution (1) after the addition of two ${\text{H}}_{\text{3}}{\text{O}}^{+}$ ions.

(c) Draw a picture that represents the equilibrium state of solution (1) after the addition of two ${\text{OH}}^{-}$ ions.