Exhibit 15-4 Consider dissolving NaF in water as shown in the equation below to answer the following question(s):
NaF (s) + H₂ O ( ) HF (aq) + NaOH (aq)
-Refer to Exhibit 15-4. What is the pH of this 0.100 M NaF solution?

Question

Exhibit 15-4 Consider dissolving NaF in water as shown in the equation below to answer the following question(s):
NaF (s) + H₂ O (  )  HF (aq) + NaOH (aq)
-Refer to Exhibit 15-4. What is the pH of this 0.100 M NaF solution?

Quizplus · Accepted Answer

NaF is a salt resulting from the neutralization of hydrofluoric acid (HF) by sodium hydroxide (NaOH). HF is a weak acid, and NaOH is a strong base. When NaF dissolves in water, it dissociates into Na+ and F- ions. The F- ion, being the conjugate base of a weak acid, reacts with water to produce HF and OH- (hydroxide ions), making the solution basic. Therefore, the pH of the solution will be greater than 7. Without the specific equilibrium calculations or the Ka value for HF provided in the question, the exact pH calculation process cannot be detailed, but among the given options, a pH value greater than 7 and close to neutral (due to the weak base nature of F-) is most plausible, making option C (pH = 8.08) the correct choice.

Exhibit 15-4 Consider Dissolving NaF in Water as Shown in the Equation