What is the pH of , `(a) 5 xx 10^(-8) `M HCl and (b) `5 xx 10^(-10) ` M HCl .

Explanation

To find the pH of the given HCl solutions, we need to consider the concentration of hydrogen ions (H⁺) contributed by both the HCl and the water itself, especially since the concentrations are very low.

### (a) For 5 x 10^(-8) M HCl:

1. **Identify the concentration of H⁺ ions from HCl**:
- The concentration of H⁺ ions from HCl is 5 x 10^(-8) M.

2. **Consider the contribution of H⁺ ions from water**:
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