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What is the total molar concentration of ions in `0.350M` solution of `Na_(2)SO_(4)` assuming its complete isonisation?

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`Na_(2)SO_(4(s))overset(H_(2)O)rarr2Na_((aq.))^(+)SO_(4(aq.))^(2-)`
Total molar concentration `=[Na^(+)]+[SO_(4)^(2-)]`
`=(2xx0.35)+0.35= 1.05M`

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