What is the value pH pf `10^(-7) ` mol `"litre"^(-1)` HCl at `25^(@)C` ?

Explanation

To find the pH of a \(10^{-7}\) mol/L HCl solution at \(25^\circ C\), we will follow these steps:

### Step 1: Understand the dissociation of HCl
HCl is a strong acid that completely dissociates in water:
\[ \text{HCl} \rightarrow \text{H}^+ + \text{Cl}^- \]
This means that the concentration of \(\text{H}^+\) ions from HCl is \(10^{-7}\) mol/L.
...