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Concentration Terms

If 100 N /...

Question

If $100 N / 5 {N H}_{4} O H$ and HCl are mixed. Find out the pH of the resultant solution if ${p K}_{b}$ for ${N H}_{4} O H$ is $10^{- 5}$

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Solution

$[S a l t] = \frac{1}{5} = 0.2 M$
$p K_{b} = 5$
For salt of weak base and strong acid,
$p H = 7 - \frac{1}{2} [p K_{b} + log C = 7 - \frac{1}{2} [5 + log 0.2] = 4.85$

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