Question

Why $\mathrm{KCl}$ is used in pH meter?

Answer 1

pH meter:

1. A pH meter is a device that measures the acidity or alkalinity of a solution.
2. The degree of acidity or alkalinity is measured in pH, which is a unit of measurement.

Potassium chloride:

1. The electrode receives chloride ions from Potassium chloride $\left(\mathrm{KCl}\right)$.
2. The use of $\mathrm{KCl}$ for this purpose has the benefit of being pH-neutral.
3. pH meters typically utilize KCl solutions with concentrations ranging from 3 molars to saturated.

Hence, $\mathrm{KCl}$ is used in the pH meter as it receives Chloride ions.