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A strip of indicator paper, turned blue, rests on a circular pH color chart, showing the liquid tested is alkaline.
How is the pH scale used to measure acids and bases?
pH meter A strip of pH paper rests on the rim of a container holding a yellow liquid, with a color comparison chart and several unused pH strips nearby.
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How is the pH scale used to measure acids and bases?
The fundamentals of acids and bases and how the pH scale is used to measure them.
Video: © American Chemical Society (A Britannica Publishing Partner)

Images

Alkaline testing
Indicator paper is used to determine the pH of a liquid. The paper will turn blue...
© Sabine Kappel/Shutterstock.com
pH meter
A pH meter is used to measure the acidity or basicity of liquids.
© photongpix/Fotolia
pH paper
Strip of pH paper resting on specimen, with a comparison chart.
© Christina Richards/Shutterstock.com
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