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Calculate the weight of (NH(4))(2)SO(4) ...

Calculate the weight of `(NH_(4))_(2)SO_(4)` which must be added to `500mL` of `0.2M NH_(3)` to yield a solution of `pH = 9.35. K_(a)` for `NH_(3) = 1.78 xx 10^(-5)`.

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The correct Answer is:
`5.248 g;`
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