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The scale formation in a kinetic used for boiling water is caused by the presence...

Chemistry
JAMB 1981
The scale formation in a kinetic used for boiling water is caused by the presence in water of?
  • A. calcium sulphate
  • B. calcium carbonate
  • C. calcium hydrogen carbonate
  • D. calcium hydroxide
  • E. magnesium sulphate
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Correct Answer: Option C
Explanation
The scale is produced when soluble Ca(HCO3)2 breaks down on heating to form insoluble CaCO3

eqn Ca (HCO3)2(aq) -----> CaCO3 (s) + CO2 (g) + H2O (l)
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