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Chemical Properties

A sodium comp...

Question

A sodium compound X which is also used as antacid when treated witth HCl gives off an acidic gas Y. Y on passing through lime water turns it milky.

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Solution

The compound X is sodium hydrogencarbonate, also known as sodium bicarbonate or baking soda. Its chemical formula is NaHCO₃. Its reaction with acid is written as follows
NaHCO₃ + HCl ---------> NaCl + H₂O + CO₂ (â†‘)
The compound Y is carbon dioxide, CO₂. It is an acidic gas which turns lime water milky. Its reaction with lime water [Ca(OH)₂] is written as
Ca(OH)₂ + CO₂ --------> CaCO₃ + H₂O

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