he concept of pH was introduced by Danish chemist Soren Sorensen in 1909. The exact meaning of p is unknown, often referred to as “Power of Hydrogen” or some say “Potential Hydrogen”.

The pH of a solution is a measurement of its acidity or alkalinity and is defined as “The negative logarithm of the hydrogen ion concentration”.

The full scale runs from 1 to 14 and is logarithmic; 7 is considered as neutral – neither acidic nor alkaline; Below 7 is the acid range; Above 7 is the alkaline range; `