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100 mL of tap water containing Ca(HCO3)2...

100 mL of tap water containing `Ca(HCO_3)_2` was titrated with N/50 HCl with methyl orange as indicator. If 30 mL of HCl were required, calculate the temporary hardness as parts of `CaCO_3` per `10^6` parts of water.

A

150 ppm

B

300 ppm

C

450 ppm

D

600 ppm

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