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lime water turns milky in the presence of CO2 Limewater (a solution of Calcium hydroxide) - when carbon dioxide is blown through the solution, a precipitate of Calcium carbonate is produced. The solution is said to turn "milky" or "cloudy". Bromothymol blue (pH range 2.4 to 4.6) (red in colour) is added to distilled water, which turns it yellow. Carbon dioxide turns the resulting yellow solution green.

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Two solutions that can be used to test for carbon dioxide are limewater (calcium hydroxide solution) and bromothymol blue indicator. Limewater turns milky when carbon dioxide is present, indicating the formation of calcium carbonate. Bromothymol blue changes color from blue to yellow in the presence of carbon dioxide.

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10mo ago
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Q: What 2 solutions can be used to test for carbon dioxide?
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