Question

A student wants to dissolve the maximum amount of CaF2 (Ksp = 3.2 x 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
iv) 0.01 M Ca(OH)2
(b) Which would dissolve the least amount of salt?

Answer 1

The answer to A would be iv) 0.01 M HCL, but I'm not sure what the answer to part B is. Hope this helps.

Explanation: