Calculate the per cent ionisation of `0.20` M solution of hydrocyanic acid, `HCN`. `K_alpha` for `HCN `=`4.9xx10^(-10)` .

Explanation

To calculate the percent ionization of a 0.20 M solution of hydrocyanic acid (HCN), we will follow these steps:

### Step 1: Write the dissociation equation
Hydrocyanic acid (HCN) dissociates in water as follows:
\[ \text{HCN} \rightleftharpoons \text{H}^+ + \text{CN}^- \]

### Step 2: Define the initial concentration and change in concentration
Let:
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