1.

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.

Answer»


Solution :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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