Measuring pH levels. Schoolgirl using a pH meter to measure the acidity of a liquid in a conical flask. Acidity and pH is a measure of the concentrati

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Measuring pH levels. Schoolgirl using a pH meter to measure the acidity of a liquid in a conical flask. Acidity and pH is a measure of the concentration of hydrogen ions in a liquid.

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Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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