First slide

PH of strong acids and strong bases

Question

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

Moderate

A

1
B

0.301
C

0.699
D

7

Solution

$V_{a} N_{a} = 1 (0.2 M) 2 = 0.4; V_{b} N_{b} = 1 (0.2 M) 1 = 0.2; [H^{+}] = \frac{0.4 - 0.2}{2} = 0.1 M; p^{H} = - \log [H^{+}] = - \log (10^{- 1}) = 1$

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