Which compound will most likely show an increase in solubility if you lower the pH of...
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Which compound will most likely show an increase in solubility if you lower the pH of the solution?
A) PbF2 B) NaCl C) AgCl D) CuBr E) Hg2I2
The answer is A, but can i get an explanation? And why are the others not correct
Homework Answers
If the pH of the solution is lowered, this means H+ ion concentration is increased. Conjugate bases of weak acids will form the weak acid on reacting with H+.
PbF2 dissociates as
PbF2 (s) 
Pb2+ (aq) + 2 F- (aq)
Fluoride ion F- is the conjugate base of weak acid hydrofluoric acid HF
When H+ ion concentration is increased,
F- (aq) + H+ (aq)
HF (aq)
This reaction decreases the F- concentration of solution and more PbF2 dissolves to maintain the F- concentration. This increases the solubility of PbF2
This whole process is only true for conjugate bases of weak acids.
In NaCl, conjugate base is Cl- which comes from strong acid HCl (hydrochloric acid)
In AgCl, conjugate base is Cl- which comes from strong acid HCl (hydrochloric acid)
in CuBr, conjugate base is Br- which comes from strong acid HBr (hydrobromic acid)
in Hg2I2, conjugate base is l- which comes from strong acid Hl (hydroiodic acid)
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