Testing pH of soils

Testing pH of soils

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Credit: SCIENCE PHOTO LIBRARY

Caption: Testing the pH of soils with litmus paper. On the left is an acidic soil, which turns blue litmus paper red. At right is an alkaline soil, which runs red litmus paper blue.

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Keywords: acid, acidity, alkali, alkaline, alkalinity, biological, biology, blue, botanical, botany, chemical, chemistry, colour change, compared, comparison, cut out, cut-out, cutout, demonstration, earth, education, experiment, ground, horticultural, horticulture, hydrogen ion concentration, indication, indicator, litmus paper, no-one, nobody, pair, ph, red, school, school science, science education, soil, two, white background

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