Chemistry pupil

Chemistry pupil

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. Chemistry pupil adding universal indicator (UI) to several different solutions to measure their pH (acidity). UI is a mixture of chemicals that changes colour depending on the pH of its environment. In strong acids it is red, weaker acids turn it orange and yellow. In neutral solutions such as water it is yellow/green. In alkalis it is either blue (weak alkalis) or purple (strong alkalis, such as bleach).

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Keywords: adding, asian, chemical indicator, chemistry lesson, child, discover, education, experiment, experimenting, female, girl, laboratory, learning, observation, pipette, pipetting, pupil, rack, reaction, safety glasses, school, schoolchild, schoolgirl, student, teenage, teenager, test tubes, tube, universal indicator, youth

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