Consider the buffer system of hydrofluoric acid, HF, and its salt, NaF.
HF(aq) + H2O(l) H3O + (aq) + F− (aq)
a. The purpose of this buffer system is to:
1. maintain [HF ]
2. maintain [F− ]
3. maintain pH
b. The salt of the weak acid is needed to:
1. provide the conjugate base
2. neutralize added H3O+
3. provide the conjugate acid
c. The addition of OH− is neutralized by:
1. the salt
2. H2O
3. H3O+
d. When H3O + is added, the equilibrium shifts in the direction of the:
1. reactants
2. does not change
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