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
temp. hardness
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