Given:
The hydrogen ion concentration of a solution is 0.0001 mol/L
we will find the value of pH
The relation between pH and the hydrogen ion concentration H will be:
![pH=-\log H^+](https://img.qammunity.org/2023/formulas/mathematics/college/ac3vxavsxo07mcdmjji7m7joz7mr9uwy06.png)
Given H = 0.0001 mol/L
so, the value of pH will be as follows:
![pH=-\log (0.0001)=-\log 10^(-4)=-(-4\log 10)=4](https://img.qammunity.org/2023/formulas/mathematics/college/gapfywy3e01slxsoe2tth8pr2vxb91zg0o.png)
so, the answer will be pH = 4