Question

What happens when hydrochloric acid reacts with egg shells and the gas produced is passed into lime water give equations?

Answer 1

Here is your answer dear friend ,
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✴️The HCl will react with egg shell ( calcium carbonate) to produce calcium chloride, water and carbon dioxide gas.

HCl + CaCO3 = CaCl2 + H20(l) +CO2(g)

✴️When the carbon dioxide is passed through the lime water it will turn it milky because of formation of calcium carbonate precipitate and water.
Ca(OH)2 + CO2 = CaCO3 + H2O

✴️But if CO2 is passed in excessive amount, then it's milkyness will disappear and form calcium bicarbonate.
Ca(OH)2 + CO2(excess) = Ca(HCO3)2 + H2(g)

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Answer 2

ANSWER :

Lime water turns milky and hence the gas is carbon-dioxide.

We already know that egg shells contain calcium carbonate .

Hence the only thing that can displace is HCl .

Thus the answer is HCl as only an acid can perform the above reaction and displace the calcium carbonate to liberate an acidic gas.

Reaction :

CaCO₃ + 2HCl => CaCl₂ + H₂O + CO₂

CO₂ + Ca(OH)₂=>CaCO₃ + H₂O