CBSE Class 10 Science 2017 · Paper 31/1/1/C · Question 35
What do you observe when you add sodium bicarbonate to acetic acid ? How would you identify the gas released in the reaction ? Describe briefly.
Answer
Brisk effervescence occurs; the colourless gas turns lime water milky, so it is carbon dioxide.
Observation: a brisk effervescence, as bubbles of a colourless gas are given off: .
Identification: pass the gas through a delivery tube into lime water. The lime water turns milky because carbon dioxide forms insoluble white calcium carbonate: . So the gas is carbon dioxide.
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