Calculate the pH after the addition of 90 ml and 100 ml respectively of 0.1 N NaOH to 100 ml 0.1 N `CH_(3)COOH` ( given `pK_(a)` for `CH_(3)COOH = 4.74 ` ) .

Explanation

To solve the problem of calculating the pH after the addition of 90 ml and 100 ml of 0.1 N NaOH to 100 ml of 0.1 N CH₃COOH, we will follow these steps:

### Step 1: Calculate the initial millimoles of CH₃COOH and NaOH

1. **For CH₃COOH:**
- Volume = 100 ml
- Normality = 0.1 N
- Millimoles of CH₃COOH = Normality × Volume (in ml) = 0.1 × 100 = 10 mmoles
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