pH test

pH test

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: MODEL RELEASED. pH test. School student using universal indicator to test the pH level of the contents of a test tube. Here, the green universal indicator has turned red, indicating that the contents of the test tube is acidic.

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Keywords: acid, acidic, acidity, apparatus, caucasian, chemical, chemistry, child, color, color-change, colour change, colour-change, device, equipment, experiment, experimenting, female, girl, glasses, human, lab, laboratory, liquid, one person, people, ph, pipette, pipetting, red, safety goggles, school, schoolgirl, science education, solution, student, test, test tube, test-tube, testing, universal indicator, white, young

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