Make the equation of chemical reactions: P → P2O4 → X → K3PO4 Ca → CaO → X → CaCO3

| March 15, 2021 | education

A)

1. Make the equation of the reaction between phosphorus and oxygen, as a result of which phosphorus (V) oxide is formed.

4P + 5O2 = 2P2 O5.

2. Phosphorus oxide – acidic oxide – when interacting with water, forms the corresponding phosphoric acid. We compose the equation of the reaction between phosphorus oxide and water.

P2O5 + 3 H2O = H3PO4.

3. Let’s compose the equation of the reaction between phosphoric acid and potassium hydroxide. The reaction products are potassium phosphate and water.

2H3PO4 + 3KOH = K3PO4 + 3H2O.

B)

1. Make the equation for the reaction of calcium combustion. The reaction product is calcium oxide.

2Са + О2 = 2СаО

2. Calcium oxide – basic oxide, reacting with water, forms a base – calcium hydroxide.

CaO + H2O = Ca (OH) 2.

Alkalis react with acidic oxides to form salts.

When carbon dioxide is passed through calcium hydroxide (lime water), a slightly soluble substance is formed – calcium carbonate, which precipitates.

Ca (OH) 2 + CO2 = CaCO3 + H2O.



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