1.

The concentration of Al^(3+)ion in aqueous solution of Al_(2)(SO_(4))_(3) is 0.28 M Then the concentration of SO_(4)^(2-) ion in this solution will be:

Answer»

0.28 M
0.042 M
0.42 M
0.84 M

Solution :Ionisation of `Al_(2)(SO_(4))_(3)` in its aqua solution
`Al_(2)(SO_(4))_(3) overset(H_(2)O)rarr 2Al_((aq))^(3+) + 3SO_(4(aq))^(2-)`
ACCORDING to STOCHIOMETRY of the REACTION `2AL^(3+)`IONS and `3SO_(4)^(2-)` ions are formed.
`SO_(4)^(2-)` ions `=(0.28xx3)/(2) = 0.42 M`


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