Acid/base indicators are described and used to identify substances as acids or bases. Indicators and the pH Scale: Acid/base indicators are described and used to identify substances as acids or ...

Who was S.P.L. Sørensen? Born in Havrebjerg, Denmark in 1868, Sørensen was a Danish chemist who established the pH scale, which tests the acidity or alkalinity of a substance.

A worker checks the pH level of desalinated water in the laboratory at the desalination plant in Palma de Mallorca on April 4, 2014. The pH scale was initially invented in 1909 by chemist S.P.L ...