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In a gravimetric determination of P, an ...

In a gravimetric determination of P, an aqueous solution of dihydrogen phosphate ion `H_(2)PO_(4)^(-)` is treated with a mixture of Ammonium and magnesium ions to precipitate magnesium ammonium phosphate `[Mg(NH_(4))PO_(4).6H_(2)O]`.This is heated and decomposed to magnesium pyrophosphate `(Mg_(2)P_(2)O_(7))`. Which is weighed. A solution of `H_(2)PO_(4)^(-)` yielded 1.85 g of `Mg_(2)P_(2)O_(7)`. What weight (grams) of `NaH_(2)PO_(4)` was present originally.

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The correct Answer is:
2
`2NaH_(2)PO_(4) to to to Mg_(2)P_(2)O_(7)`
`2 xx 120 g" "222 g`
222 of `Mg_(2)P_(2)O_(7)` obtained from 240 grams of `NaH_(2)PO_(4)`
1.85g obtained from how many grams = `(1.85 xx 240)/(222)=2`
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