Question

MgNH
4
PO
4
.
6H
2
O loses H
2
O stepwise as it is heated. Between 40°C and 60°C the
monohydrate (MgNH
4
PO
4
.
H
2
O) is formed and above 100°C the anhydrous material
(MgNH
4
PO
4
) is formed. What are the phosphorus percentages of the monohydrate and
anhydrous material?

Answer 1

Answer on Question #49003, Chemistry, Other

**Task:**

MgNH₄PO₄.6H₂O loses H₂O stepwise as it is heated. Between 40°C and 60°C the monohydrate (MgNH₄PO₄.H₂O) is formed and above 100°C the anhydrous material (MgNH₄PO₄) is formed. What are the phosphorus percentages of the monohydrate and anhydrous material?

**Answer:**

$$M(MgNH_4PO_4 \cdot H_2O) = 155,3\ g/mol$$ $$M(MgNH_4PO_4) = 137,3\ g/mol$$ $$M(P) = 31\ g/mol$$ $$\%P(MgNH_4PO_4 \cdot H_2O) = \frac{31}{155,3} \times 100 = 20\%$$ $$\%P(MgNH_4PO_4) = \frac{31}{137,3} \times 100 = 22,6\%$$

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