By conducting a chemical analysis of water, it was determined that the element phosphorus was found

| September 27, 2021 | education

By conducting a chemical analysis of water, it was determined that the element phosphorus was found in the form of PO4. To reduce the concentration of phosphorus, it was treated with Ca (OH) 2 or Al2 (SO4) 3. Write equations for transformations

We will assume that the PO4 ^ (3-) ions in water were formed as a result of the dissolution of sodium phosphate – Na3PO4.

Let’s write down the reaction equations:

1) Na3PO4 + Ca (OH) 2 = NaOH + Ca3 (PO4) 2, calcium phosphate (Ca3 (PO4) 2) will precipitate

Let’s arrange the coefficients:

2 Na3PO4 + 3 Ca (OH) 2 = 6 NaOH + Ca3 (PO4) 2

We write down the ionic equations:

6 Na ^ (+) + 2 PO4 ^ (3-) + 3 Ca ^ (2+) + 6OH ^ (-) = 6 Na ^ (+) + 6OH ^ (-) + Ca3 (PO4) 2

2 PO4 ^ (3-) + 3 Ca ^ (2+) = Ca3 (PO4) 2

2) Na3PO4 + Al2 (SO4) 3 = Na2SO4 + AlPO4, aluminum phosphate (AlPO4) will precipitate.

Let’s arrange the coefficients:

2 Na3PO4 + Al2 (SO4) 3 = 3 Na2SO4 + 2 AlPO4

We write down the ionic equations:

6 Na ^ (+) + 2PO4 ^ (3-) + 2 Al ^ (3+) + 3SO4 ^ (2-) = 6 Na ^ (+) + 3SO4 ^ (2-) + 2 AlPO4

2PO4 ^ (3-) + 2 Al ^ (3+) = 2 AlPO4

PO4 ^ (3-) + Al ^ (3+) = AlPO4



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