Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solutions of pH 12 is . The value of is ______ (Nearest integer). Assume complete dissociation. [2023]

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Solution

Q.
Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solutions of pH 12 is $x \times 10^{- 1}$ . The value of $x$ is ______ (Nearest integer). Assume complete dissociation. [2023]

Ans.
(5)

$pH = 12 \Rightarrow pOH = 2 so [{OH}^{-}] = 10^{- 2} M .$

$Millimole of [{OH}^{-}] = 10^{- 2} \times 100 = 1$

$Ca {(OH)}_{2} (s) ⟶ {Ca}^{2 +} (a q .) + 2 {OH}^{-} (a q .)$

$\frac{1}{2} millimole$ $1 millimole$

${millimole of Ca(OH)}_{2} = \frac{1}{2} = 5 \times 10^{- 1} millimole .$

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