CBSE Class 10 Science 2018 · Paper 31(B) · Question 23
What happens when you add few drops of acetic acid to a test tube containing powder of sodium hydrogen carbonate ? List two observations. Write the name of the gas evolved and the method of its testing.
Answer
Brisk effervescence occurs; the colourless gas turns lime water milky, so it is carbon dioxide.
Acetic acid reacts with sodium hydrogencarbonate and carbon dioxide gas is given off:
Observations: (i) brisk effervescence (fizzing) takes place; (ii) a colourless, odourless gas is evolved.
Gas evolved: carbon dioxide ().
Test: pass the gas through lime water; the lime water turns milky, because white, insoluble calcium carbonate is formed: .
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