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Ways to Define Concentration

50 ml H2O is ...

Question

$50 m l H_{2} O$ is added to a $50 m l$ solution of $B a (O H)_{2}$ of strength $0.01 M$ . The $p H$ of the resulting solution will be____

8

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12

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Solution

The correct option is C $12$
$0.01 M B a (O H)_{2} = 0.02 N B a (O H)_{2}$

$N_{1} V_{1} = N_{2} V_{2}$

$[0.02 N] \times [50 m l] = N_{2} \times 100 m l$

$N_{2} = \frac{0.02 \times 50}{100} = 10^{- 2} N; [O H^{-}] = 10^{- 2} N$

$p O H = 2$ or $p H = 12$
Option C is correct.

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