Question

when a piece of limestone reacts with dilute HCl a gas is produced, when gas X is passed through lime water then a white precipitate Y is formed. on passing excessive of gas X the white precipitate dissolves forming a soluble compounds Z.
a)What are X,Y, and Z
b)write equation for the reactions taking palce

Answer 1

X : Carbon dioxide              CaCO3+HCl  → Cacl2+ H2O+CO2     
Y : Calcium Carbonate      Ca(OH)2 + CO2 → CaCO3 + H2O
Z : Ca(HCO3)2                    CaCO3+H2O+CO2-> Ca(HCO3)2

Answer 2

x=CO2,y=CaCO3,z=Ca(HCO3)2

a)CaCO3+Ca(OH)2=CaCO3+H2O

b)CO2+Ca(OH)2=CaCO3+H2O

c)CaCO3+CO2+H2O=Ca(HCO3)2

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