The scale formation in a kinetic used for boiling water is caused by the presence in water of?
- calcium sulphate
- calcium carbonate
-
calcium hydrogen carbonate
- calcium hydroxide
- magnesium sulphate
The correct answer is: C
Explanation
The scale is produced when soluble Ca(HCO3)2 breaks down on heating to form insoluble CaCO3eqn Ca (HCO3)2(aq) -----> CaCO3 (s) + CO2 (g) + H2O (l)