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Solubility Product

What is the p...

Question

What is the $p H$ of a solution in which $10 mL$ of $0.1 M S r (O H)_{2}$ is added to $10 mL$ of $0.1 M H C l ?$
(Given: $log 5 = 0.7$ )

A

2.3

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B

1.5

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C

12.7

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D

7.0

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Solution

The correct option is C $12.7$
Milli-equivalents of $H C l = 10 \times 0.1 = 1$
Milli-equivalents of $S r (O H)_{2} = 2 \times 0.1 \times 10 = 2$
Concentration of remaining $[O H]^{-} = \frac{2 - 1}{20} = 0.05$
$p O H = - log [O H^{-}] = - log (0.05) = 1.3$
$∴ p H = 14 - 1.3 = 12.7$

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p K_{b} (N H_{3}) = 5; l o g 3 = 0.48

p K_{a} (C H_{3} C O O H) = 5; l o g 2 = 0.30

Column-I	Column-II
$P) 10 m L 0.1 M N H_{4} O H + 15 m L 0.05 M H C l$	3
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