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A sample of hard water contains 20 mg of...

A sample of hard water contains 20 mg of `Ca^(2+)` ions per litre. How many millimoles of `Na_(2)CO_(3)` would be requried to soften 1 L of the sample. Also calculate the mass of `Na_(2)CO_(3)`.

A

1

B

`10^(-3)`

C

10

D

`10^(-5)`

Text Solution

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The correct Answer is:
B
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