Chemistry
Give balanced equations to show how -
(a) Temporary hardness enters into water.
(b) Temporary hardness in water can be removed by boiling.
(c) Permanent hardness in water can be removed by addition of washing soda.
Water
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Answer
(a) CaCO3 + H2O + CO2 ⟶ Ca(HCO3)2
MgCO3 + H2O + CO2 ⟶ Mg(HCO3)2
(b) Ca(HCO3)2 CaCO3 ↓ + H2O + CO2 [g]
Mg(HCO3)2 MgCO3 ↓ + H2O + CO2 [g]
(c)
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