Litmus paper test

Litmus paper test

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Litmus paper test. Litmus paper changes colour in acidic or alkaline conditions. It is a mixture of lichen pigments. It turns red in acids (left) and blue in alkalis (right). Distilled water (H2O, centre) is neutral and does not cause a colour change.

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Keywords: acid, acidic, alkali, alkaline, base, basic, bottle, chemical, chemicals, chemistry, distilled water, experiment, hydrochloric, indicator, litmus paper, neutral, ph, reaction, reagent bottles, school, sodium hydroxide, test, testing

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