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pH of a Solution

Cacullate the...

Question

Cacullate the pH of a $0.2 M$ solution of strychnine hydrochloride. $(p K_{b} = 1 \times 10^{- 7})$

4.325

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3.8494

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6.371

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none of these

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Solution

The correct option is B $3.8494$
Strychnine is a base and its conjugate acid strychninehydrochloride is a weak acid.
$p H = 1 / 2 p K_{a} - 1 / 2 log C$ $|$ $p K_{a} = 14 - p K_{b} = 14 - 7 = 7$
$= \frac{7}{2} + \frac{0.7}{2} = 3.85$

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