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2.5 g of an inpure sample of sodium bica...

2.5 g of an inpure sample of sodium bicarbonate when strongly heated gave 300ml of carbondioxide measured at `27^(@) and 760`mm pressure. Calculate the percentage purity of the sample. (Na=23, C=12, O=16).

Text Solution

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`underset(2(23+1+12+3times6)=168g)(2NaHCO_(3)) to underset(22400ml(at STP))(Na_(2)CO_(3))+CO_(2)+H_(2)O`
Let the volume of `CO_(2)` at STP be V ml Now, 22400 ml of `CO_(2)` is produced from 168g of `NaHCO_(3)`
`therefore` 273ml of `CO_(2)` is produced from `(168times273)/(22400)g=2.047g` of `NaHCO_(3)`
`therefore` Purity of the sample of sodium bicarbonate`=(2.047)/(2.5)times100=81.9%`
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