Potassium orthophosphate was added to 32.8 g of calcium nitrate solution with a mass fraction of 15%

| February 4, 2021 | education

Potassium orthophosphate was added to 32.8 g of calcium nitrate solution with a mass fraction of 15%. calculate the mass of the precipitate formed.

3Ca (NO3) 2 + 2K3PO4 = Ca3 (PO4) 2 + 6KNO3.
The precipitate in this reaction is calcium phosphate. It is his mass that needs to be found.
1) Calculate the mass of the solute of calcium nitrate in its solution:
15 = (x / 32.8) * 100%.
x = 4.92g.
2) Find the amount of calcium nitrate substance: 4.92 / (40 + 28 + 96) = 4.92 / 164 = 0.03 mol.
3) We find the amount of calcium phosphate substance according to the reaction equation: for 3 mol of calcium nitrate, there is one mol of calcium phosphate. This means that the amount of calcium phosphate substance is 0.01 mol.
4) Find the mass of the sediment formed: 0.01 * 310 = 3.1 g – the answer.



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