The e.m.f of the following cell
`Pt"|" H_(2)(1 " atm.")//H^(+) (aq "||"Ag^(+) (1M) 1Ag (s) " at "25^(@)C` is 0.87V. Calculate the pH of the acid solution.
`E_("Ag^(+)//Ag)^(Theta)=0.80V, E_(2H^(+)//H_(2))=0.0V`

Explanation

To solve the problem, we will follow these steps:

### Step 1: Identify the half-reactions and their standard electrode potentials.
We have two half-reactions:
1. The reduction of silver ions:
\[ \text{Ag}^+ + e^- \rightarrow \text{Ag} \quad E^\circ = 0.80 \, \text{V} \]
...