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Arrehenius Theory of Acids and Bases

The pH value ...

Question

The pH value of decinormal solution of ${N H}_{4} O H$ , which is $20$ % ionised, is:

13.30

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14.70

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12.30

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12.95

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Solution

The correct option is C $12.30$
Decinormal solution means concentration is $0.1 N$ .

$[{O H}^{-}] = C α = 0.1 \times 0.2 M = 0.02 M$

$p O H = - log [{O H}^{-}] \approx 1.7$

$p H = 14 - p O H = 12.3$

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