# Make the reaction equations corresponding to the following transformations • Ca-CaO-Ca (OH) 2-Ca (NO3)

Make the reaction equations corresponding to the following transformations • Ca-CaO-Ca (OH) 2-Ca (NO3) 2-CaSO4 • C-CO2-Na2CO3-CO2-CaCO3 • P-P2O5-H3PO4-Ca3 (PO4) 2-H3PO4-Ca (H2PO4) 2 • Fe2 (SO4) 3-Fe (OH) 3-Fe2O3-Fe2 (SO4) 3

1. • Ca-CaO-Ca (OH) 2-Ca (NO3) 2-CaSO4:

2Са + О2 = 2СаО

CaO + H2O = Ca (OH) 2

Ca (OH) 2 + 2HNO3 = Ca (NO3) 2 + 2H2O

Ca (NO3) 2 + K2SO4 = 2KNO3 + CaSO4 (calcium sulfate is a water-insoluble compound that precipitates).

2. • C-CO2-Na2CO3-CO2-CaCO3:

C + O2 = CO2

CO2 + 2NaOH = Na2CO3 + H2O (blowing carbon dioxide through an alkali solution)

Na2CO3 = Na2O + CO2 (decomposition occurs when heated)

Ca (OH) 2 + CO2 = CaCO3 + H2O (blowing carbon dioxide through the lime mortar)

3. • P-P2O5-H3PO4-Ca3 (PO4) 2-H3PO4-Ca (H2PO4) 2:

4P + 5O2 = 2P2O5

P2O5 + 3H2O = 2H3PO4

2H3PO4 + 3Ca (OH) 2 = Ca3 (PO4) 2 + 6H2O

Ca3 (PO4) 2 + 3H2CO3 = 3CaCO3 + 2H3PO4

2Н3РО4 + 2Са = 2СаН2РО4 + Н2 (carried out with a lack of calcium, if you continue to add calcium, it will displace hydrogen atoms from dihydrogen phosphate).

For neutralization, calcium hydroxide with phosphoric acid is mixed in a mass ratio of 3: 2.

4. • Fe2 (SO4) 3-Fe (OH) 3-Fe2O3-Fe2 (SO4) 3

Fe2 (SO4) 2 + 4KOH = 2K2SO4 + 4Fe (OH) 2

2Fe (OH) 3 = Fe2O3 + 3H2O

Fe2O3 + H2SO4 = Fe2 (SO4) 3 + H2O

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.