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Universal indicator scale

Universal indicator scale

A500/0252

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Credit

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

Caption

Universal indicator pH scale. The pH scale measures the strength of an acid or alkali. When universal indicator is added to a solution, it changes colour depending on the solution's pH. The tubes contain solutions of pH 0 to 14 from left to right. Acids increase in strength from pH 6 to pH 0, and alkalis increase in strength from pH 8 to pH 14. The green tube (centre) is neutral, pH 7. For a colour-enhanced version of this image, see A500/427.

Release details

Model release not required. Property release not required.

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