Boron and Carbon FamilyHard

Question

Chemical A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A

Options

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

Solution

Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 ↓ + 2H2O
    temp. hardness

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