Astudent 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?

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:

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.