briefly describe how a potentiometric ph meter works. [Hint describe how the pH meter measures the amount of H + or OH - ions in a sample]

pH meter measures the degree of acidity or alkalinity in a substance. The H + ions measures its acidity and the OH - measures the alkalinity. It usually has a voltmeter which is connected to a pH-responsive electrode and a standard electrode which has no degree of variation.

The potentiometric ph meter works functions by measuring the voltage between two electrodes and the result are usually displayed after conversion into the corresponding pH value takes place.