First slide

PH of strong acids and strong bases

Question

Equal volumes of 0.2 M $HCl$ and 0.4 M $H_{2} {SO}_{4}$ are mixed. $p^{H}$ of the resultant mixture is

Moderate

Solution

$\begin{array}{l} N_{H_{2} {SO}_{4}} = 2 (0 .4 M) = 0 .8 N \\ N_{HCl} = 1 (0 .2 M) = 0 .2 N \\ [H^{+}] = \frac{(1 \times 0 .2) + 1 (0 .8)}{2} = 0 .5 \\ P^{H} = 1 - \log 5 = 0 .301 \end{array}$

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