Question

Phosphorus occurs naturally in the form of fluorapatite, CaF23Ca3(PO4)2, the dot indicating the part CaF2 to three parts Ca3(PO4)2. The mineral is reacted with an aqueous solution of sulfuric acid. The products are phosphoric acid, hydrogen fluoride, and gypsum, CaSO42H2O. Write and balance the chemical equation describing the process.

Answer 1

The balanced chemical equation for the reaction is:

5CaF2 · 3Ca3(PO4)2 + 24H2SO4 → 20H3PO4 + 10HF + 15CaSO4 · 2H2O

This equation shows that when fluorapatite is reacted with sulfuric acid, it produces phosphoric acid, hydrogen fluoride, and gypsum. The balanced equation indicates that 5 moles of CaF2·3Ca3(PO4)2 react with 24 moles of H2SO4 to produce 20 moles of H3PO4, 10 moles of HF, and 15 moles of CaSO4·2H2O.

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