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5 g sample contain only Na(2)CO(3) and ...

5 g sample contain only `Na_(2)CO_(3)` and `Na_(2)SO_(4)` This sample is dissolved and the volume made up to 500 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M `H_(2)SO_(4)`. Calculate the percentage of `Na_(2)SO_(4)` in the sample.

Text Solution

Verified by Experts

The correct Answer is:
15.2
Only `Na_(2)CO_(3)` reacts with `H_(2)SO_(4)`
`Na_(2)CO_(3) + H_(2)SO_(4) to Na_(2)SO_(4) + H_(2)CO_(3)`
= `20 xx 0.1 =2`
no. Of moles of `Na_(2)CO_(3)` in 500 mL solution
`=500/25 xx 2= 40`
wt. Fo `Na_(2)CO_(3) = 40 xx 106 xx 10^(-3) = 4.24`g
= 84.8
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