Universal indicator scale

Universal indicator scale

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Credit: 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. This image is a colour-enhanced version of the actual pH scale (see image A500/252).

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Keywords: acid, acidic, acids, alkali, alkaline, alkalis, base, bases, basic, chemical, chemicals, chemistry, colour, colour-enhanced, concept, conceptual, enhanced, neutral, ph scale, rack, range, solution, solutions, test tube, tubes, universal indicator

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