Question

how you can indify the present of co2 gas given a chemichal test

Answer 1

The most effective way to test for CO² is to bubble the gas through "lime water", 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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