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In 100 ml sample of hard water, 100 ml o...

In 100 ml sample of hard water, 100 ml of `(N/50)`
`Na_2CO_3` was added and the mixture was boiled and filtered The filtrate was neutralized with 60 ml of `(N/50)` HCI. Calculate the permanent hardness of water, (sp gr. of hard water = 1)

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