pH meter

pH meter

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Credit: COLIN CUTHBERT/SCIENCE PHOTO LIBRARY

Caption: pH measurement. Chemist using a pH meter during quality control tests on chemicals. The pH of a solution is a measure of the amount of free hydrogen ions present. This indicates acidity and alkalinity. The more free ions present, the more acidic the solution is said to be.

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Keywords: analysis, apparatus, chemical, chemist, chemistry, equipment, industry, ph measurement, ph meter, quality check, quality control, technology

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