Hard and Soft Water

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  • Created by: Sophie
  • Created on: 15-04-13 16:53

Hard water contains dissolved calcium or magnesium ions. 

  • as rain falls, carbon dioxide in the air dissolves in it to form carbonic acid
  • H2O + CO2 = H2CO3
  • as this flows through chalk or limestone the carbonic acid reacts with calcium carbonate to make calcium hydrogencarbonate. 
  • H2CO3 + CaCO3 = Ca(HCO3)2

Hard water…

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