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Find the mass of Na(2)CO(3) required to ...

Find the mass of `Na_(2)CO_(3)` required to prepare 3250 ml of 0.5N solution. 

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Normality, `N=(W)/(GEW)xx(1000)/(V_("ml"))`
`0.5=(W)/(53)xx(1000)/(250)`
Weight of `Na_(2)CO_(3) = 6.62 g`
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