Which of the following solution will have pH = 13 on assuming complete dissociation

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Which of the following solution will have pH = 13 on assuming complete dissociation

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0.56 g of KOH in 100 ml solution

100 ml of solution of 0.1 N $Mg {(OH)}_{2}$

100 ml of solution of 0.05 M $Mg {(OH)}_{2}$

4g of NaOH in 500 ml solution

answer is A, B, D.

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Detailed Solution

$(A) [{OH}^{-}] {= 10}^{-1}$

$∴ p^{H} = 13$

$(B) {[OH]}^{-} = \frac{0.56}{56} × \frac{1000}{100} {= 10}^{-1} \Rightarrow p^{OH} {= 1 P}^{H} = 13$

$(C) [{OH}^{-}] = \frac{4}{40} × \frac{1}{0.5} = 0.2 M$

$(D) [{OH}^{-}] {= M × n. factor × V = 0.05 × 2 = 10}^{-1}$

$∴ p^{H} = 13$

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