First slide

PH scale, PH of strong acids and strong bases

Question

The hydrogen ion concentration of 0.2M CH₃COOH which is 4% ionised is

Moderate

A

0.008N
B

0.12N
C

0.8N
D

0.08N

Solution

$[H^{+}] = C_{0} α = \sqrt{K_{a} C_{0}}$
$\Rightarrow [H^{+}] = 2 \times 10^{- 1} \times 4 \times 10^{- 2} = 8 \times 10^{- 3}$

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