N/20 solution of a monobasic acid is 3.5% dissociated at a given temperature . calculate ionisation constant of the acid .

Explanation

To calculate the ionization constant (Ka) of a monobasic acid from the given information, we can follow these steps:

### Step 1: Understand the Given Information
We are given:
- A monobasic acid (let's denote it as HA).
- The normality of the solution is N/20, which means the concentration (C) is 1/20 N.
- The degree of dissociation (α) is 3.5%, which can be expressed as a decimal.

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