A buffer solution contains 0.02 moles of` NH_4OH and 0.03 `moles of `NH_4CI` dissolved in 1 litre of the solution. Calculate the pH of the solution. Dissociation constant of `NH_4OH "is" 1.8 xx 10^-5`

Explanation

To calculate the pH of the buffer solution containing 0.02 moles of NH₄OH and 0.03 moles of NH₄Cl, we can use the Henderson-Hasselbalch equation. Here’s a step-by-step solution:

### Step 1: Identify the components of the buffer solution
- The base (weak base) is NH₄OH (ammonium hydroxide).
- The salt (conjugate acid) is NH₄Cl (ammonium chloride).

### Step 2: Write the Henderson-Hasselbalch equation
The Henderson-Hasselbalch equation for a basic buffer is given by:
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