A saturated, aqueous solution of a salt having the formula, AX3, is prepared. Th

Question

A saturated, aqueous solution of a salt having the formula, AX3, is prepared. The equilibrium that is established is: AX3(s) A3+(aq) + 3 X-(aq). At equilibrium, the concentration of X- is found to be 7.99 x 10-6 M. What is the solubility product constant, Ksp, for AX3?

What is the solubility of this compound in a solution that is 2.062 x 10-02 M NaX (assume that NaX is a completely soluble compound).

A saturated, aqueous solution of a salt having the formula, AX2, is prepared. The equilibrium that is established is AX2(s) A2+(aq) + 2 X-(aq). What is the molar solubility of the salt if the solubility product constant, Ksp, for the salt is 7.99 x 10-13 ?

Explanation / Answer

AX3 <-> A+3 + 3X-

Ksp = [A+3][X-]^3

[X-] = 7.99*10^-6

S = ?

[A+3] = 1/3*X- = 1/3*7.99*10^-6 = 2.6633*10^-6

Ksp = [A+3][X-]^3

Ksp = (2.6633*10^-6)*(7.99*10^-6)^3

Ksp = 1.358*10^-21

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