What is pH?

pH value is a figure to indicate acid, neutral or alkaline. pH value being measured from 0-14, in which it does not have any unit for it. The pH is also being defined as the concentration of hydrogen ion, H+ ion in the aqueous solution. The higher the concentration of H+ in the aqueous solution, the more acidic the aqueous sample is. The pH value will tend to be lower than pH 7 and getting lower and lower and close to pH 0.

Normally, pH is being measured/taken by using the following method:
1. litmus paper
2. Color comparator
3. pH meter

The accuracy of pH reading

pH meter > Color comparator > Litmus paper