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In the determination of hardness of a sa...

In the determination of hardness of a sample of water, the following results were obtained:
Volume of sample `H_(2)O=100 mL` volume of `N//50 Na_(2)CO_(3)` added to it `=20 mL`
volume of `N//50 H_(2)SO_(4)` used to back titrate the unreacted `NA_(2)CO_(3)=10 mL`
Calculate the hardness of water in `gL^(-1)`

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