Question

8. A student dropped a few small pieces of chalk in dilute HCl contained in a test tube.
The gas evolved was passed through lime water. What change would be observed in
lime water? Write the chemical equation involved.

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Answer 1

HELLO FRIEND ☺️

Chalk is chemically calcium carbonate.
CaCO3 + HCl (dil) ----------> CaCl2 + CO2 + H2O

When CO2 gas is passed through limewater it turns milky due to formation of insoluble calcium carbonate.

Ca(OH)2 + CO2 ----------> Ca(CO)3

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