When egg shells are treated with vinegar, a colourless gas is formed. This gas when passed into slaked lime solution , it turned milky white.
a) Identify the gas formed.b) Write balanced chemical equation for its reaction with slaked lime solution.c) What change would be observed if the gas formed is passed through lime water for a long time?

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Solution

a) The gas formed is carbon dioxide
.
b) Reaction with slaked lime solution.
Ca(OH)₂+ CO₂ $\to$ CaCO₃(s) + H₂O

c) If the gas formed is passed through lime water for longer time, the milkiness disappears because it forms calcium bicarbonate which is soluble in water.
CaCO₃(s) + H₂O + CO₂ $\to$ Ca(HCO₃)₂(aq)

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