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Universal indicator

Universal indicator

A500/0525

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Credit

ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY

Caption

Universal indicator, a mixture of pH indicators, being compared in acid and alkaline solutions. Changes in colour (here from dark blue to red or purple) are a common way to test the pH of a solution. Alkali and acid are the two parts of the pH scale, indicating the hydrogen ion concentration in a solution relative to that found in water. Alkalis (pH 8-14) contain fewer free hydrogen ions than water, while acids (pH 1-6) contain more. Water (pH 7) is considered neutral.

Release details

Model release not required. Property release not required.

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