ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Pupil performing titration. Schoolgirl dripping measured volumes of an acid from a burette (down centre). The conical flask (lower centre) contains a measured volume of an alkali and an indicator, giving it a pink colour. As the acid and alkali mix they change the pH of the solution. When the acid and alkali neutralize, the indicator changes colour.
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