A substance X is used as a building material and is insoluble in water. When reacted with dilute $HCl$ , it produces a gas that turns lime-water milky. Predict the substance. Write the chemical equations involved.

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Solution

Substance X
Substance X is calcium carbonate $({CaCO}_{3})$ .
It is also called marble or limestone.
Calcium carbonate is used as a building material.
Calcium carbonate is insoluble in water.
The reaction of Calcium carbonate and dilute Hydrochloric acid $(HCl)$
In the reaction between calcium carbonate and dilute hydrochloric acid $(HCl)$ , calcium chloride $({CaCl}_{2})$ , carbon dioxide $({CO}_{2})$ and water $(H_{2} O)$ are produced.
${CaCO}_{3} (s) + 2 HCl (aq) \to {CaCl}_{2} (aq) + H_{2} O (aq) + {CO}_{2} (g)$
The reaction of carbon dioxide and lime water.
The carbon dioxide evolved in the previous reaction reacts with limewater $(Ca {(OH)}_{2})$ to form calcium carbonate and water.
$Ca {(OH)}_{2} (s) + {CO}_{2} (g) \to {CaCO}_{3} (s) + H_{2} O (aq)$
The production of calcium carbonate is responsible for the milky white color.
Therefore, substance ‘X’ is Calcium Carbonate.

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A substance X is used as a building material and is insoluble in water. When reacted with dilute HCl, it produces a gas that turns lime-water milky. Predict the substance. Write the chemical equations involved.

A substance X is used as a building material and is insoluble in water. When reacted with dilute $HCl$ , it produces a gas that turns lime-water milky. Predict the substance. Write the chemical equations involved.