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A student wants to dissolve the maximum amount of CaF2[Ksp
Chapter 20, Problem 87P(choose chapter or problem)
Problem 87P
A student wants to dissolve the maximum amount of CaF2[Ksp = 3.2×10–11) to make 1 L of aqueous solution.
(a) Into which of the following solvents should she dissolve the salt?
(I) Pure water
(II) 0.01 M HF
(III) 0.01 M NaOH
(IV) 0.01 M HCl
(V) 0.01 M Ca(OH)2
(b) Which would dissolve the least amount of salt?
Questions & Answers
QUESTION:
Problem 87P
A student wants to dissolve the maximum amount of CaF2[Ksp = 3.2×10–11) to make 1 L of aqueous solution.
(a) Into which of the following solvents should she dissolve the salt?
(I) Pure water
(II) 0.01 M HF
(III) 0.01 M NaOH
(IV) 0.01 M HCl
(V) 0.01 M Ca(OH)2
(b) Which would dissolve the least amount of salt?
ANSWER:
Step 1 of 3
Solubility reaction of 
where 
As fluoride is weak base the following equilibrium reaction can be possible
