Consider the ionization of hydrofluoric acid as follows:
HF + H₂ O H₃O + + F 1 - What is the effect of adding the common ion, F - (source:
NaF), to this equilibrium system?

Question

Consider the ionization of hydrofluoric acid as follows:
HF + H₂ O  H₃O + + F 1 - What is the effect of adding the common ion, F - (source:
NaF), to this equilibrium system?

Quizplus · Accepted Answer

When a common ion is added to an equilibrium system, the equilibrium shifts to the side opposite of the added ion in order to decrease the concentration of that ion. In this case, the addition of F- from NaF will shift the equilibrium to the left, favoring the formation of HF and H2O. This will decrease the concentration of F-, causing the equilibrium to shift to the left. As a result, the concentration of H3O+ will decrease, leading to an increase in pH. Therefore, the correct answer is D.

Consider the Ionization of Hydrofluoric Acid as Follows