Find the pH of a solution of 0.01 M acetic acid which is only 20% ionised.

Explanation

To find the pH of a solution of 0.01 M acetic acid that is 20% ionized, we can follow these steps:

### Step 1: Calculate the concentration of ionized acetic acid
Given that the concentration of acetic acid is 0.01 M and it is 20% ionized, we can find the concentration of the ionized species (H₃O⁺ and CH₃COO⁻).

\[ \text{Ionized concentration} = \text{Initial concentration} \times \text{Percentage ionization} \]
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