Problem: A student wants to dissolve the maximum amount of CaF 2 (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

FREE Expert Solution

CaF2 Ca2+ + 2 F-


Ca: less than +3 neutral

F-: conjugate weak acid  basic 


CaF2 basic salt



(i) Pure water


does not change the solubility



(ii) 0.01 M HF


HF  H+ + F- 


common ion: F-


decrease solubility



(iii) 0.01 M NaOH


no common ion



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Problem Details

A student wants to dissolve the maximum amount of CaF (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

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Ksp concept. You can view video lessons to learn Ksp. Or if you need more Ksp practice, you can also practice Ksp practice problems.

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.