s-Block ElementsHard

Question

Chemical (A) is used for water softening to remove temporary hardness. A reacts with Na2 CO3 to generate caustic soda. When CO2 is bubled through (A), it turns cloudy (i.e. milky). What is the chemical formula of (A) ?

Options

A.CaCO3
B.CaO
C.Ca(OH)2
D.Ca(HCO3)2

Solution

The temporary hardness of water is due to the presence of bicarbonates of Ca2+ and Mg2+.
Ca(HCO3)2 + Ca(OH)2 (A) → 2CaCO3 ↓ (mikiness) + H2O.
Ca(OH)2 + Na2CO3 → CaCO3 ↓ (white) + NaOH.
Ca(OH)2 + CO2 →  CaCO3 ↓ (mikiness) + H2O.

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