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Question

1000 ml of tap water containing Ca(HCO3)2 was titrated with N50 HCl with methyl orange as indicator. If 300 ml of HCl were required, calculate temporary hardness as parts of CaCO3 per 106 parts of water
  1. 150 ppm
  2. 300 ppm
  3. 450 ppm
  4. 600 ppm


Solution

The correct option is B 300 ppm
m.eq of CaCO3=m.eq of Ca(HCO3)2=m.eqHCl=300×150=6
wt of CaCO3=6×1002mg.L1=300 ppm

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