First slide

Solubility product(KSP)

Question

Which of the following is most soluble in water?

Moderate

A

ZnS (K_sp = 7 × 10^–16)
B

Fe(OH)₃ (K_sp = 6 × 10^–38)
C

Be₃(PO₄)₂ (Ksp = 6 × 10^–39)
D

Ag₃PO₄ (K_sp = 1.8 × 10^–18)

Solution

${Ag}_{3} {PO}_{4} [s] ⇌ {Ag}_{3} {PO}_{4} [aq] \to \underset{3 S}{3 {Ag}^{+}} [aq] + {\underset{S}{{PO}_{4}}}^{- 3} [aq]$
$K_{sp} = (3 S)^{3} \times S$
⇒ 1.8 x 10^-18 = 27 x S⁴
⇒ 20 x 10^-16 = 3 x S⁴
Solubility, S will be of the order of 10^-4 which is the largest among other option.

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