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the hardness of a water sample (in ter...

the hardness of a water sample (in terms of Equivalents of `CaCO_(3)`) containing `10^(-3)MCaSO_(4)` Is :
(Molar mass of `CaSO_(4)=1365g mol^(-1)`)

A

100 ppm

B

50 p p m

C

10 p p m

D

90 p p m

Text Solution

Verified by Experts

The correct Answer is:
A
Molarity of `CaSO_4=10^(-3)M`
`rArr 10^(-3)` mol of `CaSO_4` in 1L solution
Number of gram equivalents of `CaSO_4=` number of gram equivalents of `CaCO_3`
`rArr .^(n)CaSO_4 xx "n-factor"= .^(n)CaCO_3 xx`n-factor ` rArr 10^(-3)xx2=.^(n)CaCO_(3) xx2`
`rArr .^(n)CaCO_(3)=10^(-3)` mole in 1L
`therefore ` Mass of `CaCO_(3)=10^(-3)xx100=(1)/(10) gm "in" 1L`.
`rArr ((1)/(10)xx10^3)` miligram in `1L rArr 100` miligram in `1L rArr 100` p p m.
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