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.

In a gravimetric determination of P, an aqueous solution of dihydrogen

1.	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.
Answer» Solution :`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`