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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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To calculate the hardness of water in g L^(-1) based on the given data, we will follow these steps: ### Step 1: Calculate the gram equivalents of Na2CO3 used The normality of Na2CO3 is given as N/50. This means: - Normality (N) = 1/50 N - Volume of Na2CO3 solution used = 20 mL = 20/1000 L = 0.020 L The formula for gram equivalents is: ...
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