Testing for carbon dioxide

Testing for carbon dioxide

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Testing for carbon dioxide. Apparatus used to test for the production of carbon dioxide by fermenting yeast. The yeast is placed in a test tube (right) with sugar so that it begins to ferment. The gas produced by the fermentation passes out of the tube in the bung (red) and passes into a test tube containing lime water (calcium hydroxide solution, centre). Carbon dioxide (CO2) passed into limewater produces a milky suspension of calcium carbonate. When yeast ferments it converts sugar to carbon dioxide and alcohol. Therefore the lime water turns milky.

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Keywords: apparatus, calcium carbonate, calcium hydroxide, carbon dioxide, chemical, chemistry, cloudy, device, equipment, experiment, experimenting, fermentation, fermenting, fungal, fungi, fungus, lab, laboratory, lime water, limewater, liquid, mycological, mycology, no-one, nobody, science education, solution, still life, still-life, suspension, test tube, test-tube, white background, yeast

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