Question

when the gas formed on heating limestone is passed through freshly prepared lime water, the limewater turns milky. give scientific reason please

Answer 1

The evolved gas is Carbon dioxide when a limestone was heated and passed through freshly prepared lime water. So, the lime water turns milky.

Explanation:

• When lime stone is heated strongly, it decomposes into Calcium Oxide and Carbon dioxide.

• Limestone → Calcium Oxide (Quick Lime) + Carbon dioxide

                            $\text{CaCo}_3 \rightarrow \text{CaO} + \text{CO}_2$

• Calcium oxide is also called as quick lime or slaked lime. It is yellow in color when hot and white while cold. It should not be touched with bare hands or contacted with eyes as it causes an itching sensation.

• Lime water turns milky when carbon dioxide passes through it.

• Lime water contains Calcium hydroxide which reacts with carbon dioxide to for Calcium Carbonate which is white in color.

• Calcium Hydroxide + Carbon dioxide → Calcium Carbonate

                                   $\text{CaOH}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3$

For more details, refer

Why does lime water turn milky when CO2 gas is passed through it?

brainly.in/question/2647765

Why does lime water turn milky when we blow it?

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