Question

why lime water changes the colour when carbon dioxide is blown into the test tube?​

Answer 1

Answer:

This reaction of carbon dioxide released by us with the limewater is the reason behind the change that we will observe. Lime water is also known as calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate turning its colour into white.

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Answer 2

Answer:

because of the reaction between Ca(OH)2 and CO2 and the products are CaCO3 and H2O.

CaCO3 makes the solution milky in colur.