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One litre of a sample of hard water cont...

One litre of a sample of hard water contains `5.55 mg` of `CaCl_(1)` and `4.75 mg` of `MgCl_(2)`. The total harness of ppm of `CaCO_(3)` is

A

5 ppm

B

10 ppm

C

20 ppm

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`55.5 g CaCl_(2) -= 50 g CaCO_(3)`
`55.5 mg CaCl_(2) -= 50 xx 10^(-3) CaCo_(3)`
`47.5 g MgCl_(2) -= 50 g CaCO_(3)`
`47.5 mg Mg Cl_(2) -= 50 xx 10^(-3) g CaCO_(3)`
Total `CaCO_(3) = (50 + 50) xx 10^(-2) = 10^(-2) g L^(-1)`
`ppm = (10^(-2))/(1000 mL) xx 10^(6) mL = 10`
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