40.6 MB (3.2 MB compressed)
4389 x 3232 pixels
37.1 x 27.4 cm ⏐ 14.6 x 10.8 in (300dpi)
ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Electrical pH measurement of an alkaline solution of washing soda (sodium carbonate, NaCO3, right). The pH of a solution is a measure of its acidity or alkalinity. The scale runs from 0-14, water is neutral at pH 7. A pH below 7 is an acid, pH 1 being the most acidic. Alkalis have a pH higher than 7, pH 14 being the most alkaline. The pH of this solution is 10.19.
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