pH is “potential of hydrogen.” It is a unit of measurement which represents the concentration of hydrogen ions in a solution. This unit was introduced by biochemist Soren Peter Lauritz Sorensen in 1909.
- If pH scale is Acidic – Less than 7
- Neutral – 7
- Basic – Greater than 7
pH can be determined by a pH indicator such as pH paper. pH paper usually contains weak acid or a weak base which will respond by changing colour at a specific pH. pH is determined by the concentration of H+. HCl solutions are strong acids, so we can already expect a pH less than 7.