First slide

Solubility product(KSP)

Question

Which of the following is the correct solubility of $Ni {(OH)}_{2}$ in 0.10 M NaOH? $K_{sp} of Ni {(OH)}_{2} is 2.0 \times 10^{- 15} .$

Moderate

A

$1 \times 10^{- 13}$
B

$2 \times 10^{- 13}$
C

$3 \times 10^{- 13}$
D

$5 \times 10^{- 12}$

Solution

$Ni {(OH)}_{2} \overset{}{⇌} \underset{S}{{Ni}^{+ 2}} + \underset{2 S}{2 {OH}^{-}}$
$NaOH \overset{}{\to} \underset{0.1}{{Na}^{+}} + \underset{0.1}{{OH}^{-}}$
$K_{sp} = [{Ni}^{2 +}] {[{OH}^{-}]}^{2}$
$S \times {(2 S + 0.1)}^{2} = 2 \times 10^{- 15}$
$S \times {(0.1)}^{2} = 2 \times 10^{- 15}$
$S = 2 \times 10^{- 3} M$

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