| S. P. L. Sørensen | |
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 S. P. L. Sørensen
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| Born | 9 January 1868 |
| Died | 12 February 1939 |
| Nationality | Danish |
| Fields | chemistry |
| Institutions | Carlsberg Laboratory |
| Known for | pH |
Søren Peder Lauritz Sørensen (9 January 1868 - 12 February 1939) was a Danish chemist, famous for the introduction of the concept of pH, a scale for measuring acidity and basicity. He was born in Havrebjerg, Denmark.
From 1901 to 1938 he was head of the prestigious Carlsberg Laboratory, Copenhagen.[1] While working at the Carlsberg Laboratory he studied the effect of ion concentration on proteins,[2] and because the concentration of hydrogen ions was particularly important, he introduced the pH-scale as a simple way of expressing it in 1909.[3] The article in which he introduced the scale (using the notation pH[4]), described two new methods for measuring acidity.[5] The first method was based on electrodes, while the second involved comparing the colors of samples and a preselected set of indicators.
He is also known for the Sørensen formol titration.
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