Question

WHAT HAPPENS WHEN CO2 GAS IS PASSED THROUGH LIME WATER AND WHY DOES IT DISAPPERAR ON PASSING EXCESS CO2?

Answer 1

When we pass CO2 gas from lime water it gets turn milky.

Ca(OH)2 + CO2_______CaCO3 + H20

If excess of CO2 gas is passed through lime water,milkiness will disappear due to the formation of Ca(HCO3)2 which is soluble in water.

CaCO3 + H2O +CO2_____Ca(HCO3)2

Answer 2

When CO2 passed through Lime water Ca(OH)2 the it forms a white precipitate that is called Carbonate Precipitate and Hydrogen.

Ca(OH)2 + CO2 ---------- CaCO3 + H2O.

And When excess CO2 passes through CaCO3 + H2O then it forms Calcium Bicarbonate.

CaCO3 + H2O + CO2 -------- Ca(HCO3)2.

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