how do you determine the evolving of CO2 gas
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The most effective way to test for CO2 is to bubble the gas through "limewater", a diluted solution of calcium hydroxide (slaked lime). When you bubble carbon dioxide through the solution, it forms a solid precipitate of calcium carbonate – chalk or limestone. Calcium carbonate is insoluble in water.
Thus, if there is CO2 present in the sample, the limewater will turn milky, cloudy white.
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