Meaning of the name pH is explained as the strength of hydrogen. PH describes the concentration of the hydrogen ions in a solution and it is the indicator of acidity or basicity of the solution. The pH value on a pH scale varies from 0 to 14. Soil pH is the measure of the acidity (sourness) or alkalinity (sweetness) of a soil. A simple numerical scale is used to express pH. The scale goes from 0.0 To 14.0, with 0.0 being most acid, and 14.0 being most alkaline. The value, 7.0 is neutral–i.e., neither acid or alkaline.