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

Answer:

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:

Answer 2

(a) The solvent able to dissolve the salt is 0.01 M HCl.

(b) The solvent that dissolves the least salt is 0.01 M NaOH.

What factor mediates the dissolution of salt?

The dissolution of Calcium fluoride results in the formation of calcium and fluoride ions. Calcium is neutral, while fluoride is a weak acid. Thus, salt is basic in nature.

(a) The salt with the strong acid is able to dissolve calcium fluoride ions. The nature of the following compounds has been:

• Pure water: Neutral
• 0.01 M HF: Common ion effect with calcium fluoride
• 0.01 M NaOH: Basic
• 0.01 M HCl: Acidic
• 0.01 M Calcium hydroxide: Basic

Thus, the solvent able to dissolve calcium fluoride has been 0.01 M HCl.

(b) The highly basic compound is able to dissolve the least amount of basic salt. Sodium hydroxide is highly basic in nature, thereby dissolving the least amount of salt.

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