First slide

PH of strong acids and strong bases

Question

Equal volumes of 0.15M Sulphuric acid and 0.2M Potassium hydroxide are mixed. $p^{H}$ of resultant mixture is

Moderate

A

1.301
B

1
C

1.699
D

1.398

Solution

$V_{a} N_{a} = 1 (0.15 M) 2 = 0.3; V_{b} N_{b} = 1 (0.2 M) 1 = 0.2; [H^{+}] = \frac{0.3 - 0.2}{2} = 0.05 M; p^{H} = - \log [H^{+}] = - \log (5 \times 10^{- 2}) = 1.301;$

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