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Temporary hard water is formed when rain water ... - JAMB Chemistry 2017 Question

Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of
A
CaCO3
B
Na2CO3
C
Na2SO4
D
CaSO4
correct option: a
Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.

Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over deposit of CaCO3

i.e CaCO3 + CO2 + H2O → Ca(HCO3)2
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