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A water sample contains fMgSO What is . ...

A water sample contains fMgSO What is . 68 mofCaSO4and60ppmo 4· . Mg(HC03 )2 , PP 1 ? (Atomic weights of calcmm, the hardness of the water sa~:s \ctively 40, 24 and 32). magnesium and sulphur are p (SCRA

A

50ppm

B

100ppm

C

150ppm

D

200ppm

Text Solution

Verified by Experts

The correct Answer is:
D
(i) `Ca(HCO_(3))_(2) -= CaCO_(3)`
"162 ppm" = "100 pmm"
`therefore "81 ppm" -= "50 pmm"`
(ii) `Mg(HCO_(3))_(2) -= CaCO_(3)`
`"146 ppm" -= "100ppm"`
`therefore" 68 ppm"-= "50pmm"`
(iii) `CaSO_(4) -= CaCO_(3)`
"136 ppm" -="100ppm"`
` therefore "68pmm"-= "50ppm"`
(iv) `MgSO_(4) -= CaCO_(3)`
`"120 ppm" -= "100 ppm"`
`therefore " 60 ppm" -= "50 pmm"`
Total degre of hardness of water `= 50 xx 4 = 200 "ppm"`
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