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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 of `H_2O=100mL`
Volume of `(N)/(50)Na_2CO_3` added to it `=20mL`
Volume of `(N)/(50)H_2SO_4` used to back titrate the unreacted `Na_2CO_3=10mL`
Calculate the hardness of water in g `L^(-1)`

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