CBSE Class 10 Science 2017 · Paper 31/1/1 · Question 34
A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
Answer
The gas is carbon dioxide; it turns lime water milky because calcium carbonate forms.
The gas is carbon dioxide: .
Test: pass the gas through lime water (calcium hydroxide solution) using a delivery tube. The lime water turns milky, because a white precipitate of calcium carbonate forms: . This confirms that the gas is carbon dioxide.
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