1909 – Denmark

‘A scale of acidity and alkalinity. It runs from 0 (most acid) to 14 (most alkaline).
A neutral solution has a pH of 7’

photograph of SORENSEN in the laboratory


A solution is acidic when the pH is less than 7 and basic (alkaline) when the pH is greater than 7.
The scale is logarithmic.

The pH measures the concentration of hydrogen ions, H+ , in water.

pH is defined as the negative logarithm of the hydrogen ion concentration.

The pH scale can only be used for solutions of acids and bases in water.



Acid-Base Scale diagram

Acid-Base Scale

(image source)

2 thoughts on “SOREN PETER SORENSEN (1868-1939)

  1. Pingback: ROBERT MILLIKAN (1868-1953) | A History of Science

  2. Pingback: FRIEDRICH OSTWOLD (1853-1932) | A History of Science

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