Calculate the pH of the resultant mixtures :
(a) 10 mL of 0.2 M `Ca(OH)_(2)` + 25 mL of 0.1 M HCl
(b)10 mL of 0.01 M `H_(2) SO_(4)` + 10 mL of 0.01 M `Ca(OH_(2))`
(c) 10 mL of 0.1 M `H_(2) SO_(4)` + 10 mL of 0.1 M KOH

Explanation

To solve the problem of calculating the pH of the resultant mixtures, we will break it down into three parts as given in the question.

### Part (a): 10 mL of 0.2 M `Ca(OH)₂` + 25 mL of 0.1 M HCl

1. **Calculate the normality of `Ca(OH)₂` and HCl**:
- For `Ca(OH)₂`, the n-factor is 2 (as it produces 2 OH⁻ ions).
\[
\text{Normality of } Ca(OH)₂ = 0.2 \, \text{M} \times 2 = 0.4 \, \text{N}
...