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Calculate the amount of 95% pure Na(2)CO...

Calculate the amount of `95%` pure `Na_(2)CO_(3)` required to prepare `5` litre of `0.5 M` solution.

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The correct Answer is:
`278.94g`
`(x xx 0.95)/(106)=5xx0.5`
`x=(2.5xx106)/(0.95)=278.947gm`
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