What is the meaning of ‘p’ and ‘H’ in the pH?

In the context of pH, "p" stands for "potential" and "H" represents "hydrogen." The term pH is a measure of the acidity or alkalinity of a solution. It is a logarithmic scale that quantifies the concentration of hydrogen ions (H+) in a solution.

The pH scale ranges from 0 to 14, where 7 is considered neutral. A pH value below 7 indicates acidity, with lower values indicating stronger acidity. A pH value above 7 indicates alkalinity or basicity, with higher values indicating stronger alkalinity. Each unit on the pH scale represents a tenfold difference in acidity or alkalinity.

The formula to calculate pH is:

pH = -log[H+]

Here, [H+] represents the concentration of hydrogen ions in moles per liter. By taking the negative logarithm of the hydrogen ion concentration, the pH scale compresses a wide range of values into a more manageable and easily interpretable scale.