1.

100 mL of tap water containing Ca(HCO_(3))_(2) was titrated with N//50HCl 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.

Answer»

150 ppm
300 ppm
450 ppm
600 ppm

Solution :`"30 mL N/50 HCl "-= "30 mL N/50 "Ca(HCO_(3))_(2)`
`-=" 30 mL N/50 "CaCO_(3)-="100 mL tap water"`
`"MASS of "CaCO_(3)" in 100 mL tap water"`
`=(ExxNxxN)/(1000)=(50xx30)/(50xx1000)=0.03g`
`rArr"hardness = 300 ppm"`


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