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An analytical lab needed to determine the content of phosphorus in a commercial sample of plant food. The phosphorus in a 4.258 g sample of this plant food was converted to PO₄^3- and precipitated by adding 50.00 mL of 0.0820 M AgNO₃. The excess AgNO₃ was then titrated using 4.06 mL of 0.0625 M KSCN. What was % P₂O₅ in the original plant food sample?

P₂O₅ + 9 H₂O → 2PO₄^3- + 6H₃O⁺

2PO₄^3-+ 6 Ag⁺ → 2Ag₃PO_4(s)

Ag⁺ + SCN^-→ AgSCN_(s)

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Category:- Chemistry
Reference No.:- M9784579

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