SOREN PETER SORENSEN (1868-1939)

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’

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.

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Acid-Base Scale diagram

Acid-Base Scale

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