<p>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).</p>
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Science
Chemistry
Andrew Lambert
Photography
