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What is the molartiy of SO4^(2-) ion in ...

What is the molartiy of `SO_4^(2-)` ion in aqueous solution that contain `34.2 ppm` of `AI_2(SO_4)_3`? (Assume complete dissociation and density of solution `1g/mL`)

A

`3xx10^(-4) M`

B

`2xx10^(-4)`

C

`10^(-4)M`

D

None of these

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