Question

1)CH4+.....=CO2+...... Na+.....=Na3PO4+..... Fe2O3+.....=Fe2(SO4)3+...... CaO+......=Ca3(PO4)2 2)Основание+соль=слабое основание+соль Кислота+соль=слабая кислота+соль

Answer 1

1.
CH₄ + 2O₂ = CO₂ + 2H₂O
6Na + 2H₃PO₄ = 2Na₃PO₄ + 3H₂↑
Fe₂O₃ + 3H₂SO₄ = Fe₂(SO₄)₃ + 3H₂O
3CaO + 2H₃PO₄ = Ca₃(PO₄)₂ + 3H₂O

2.
3NaOH + AlCl₃ = 3NaCl + Al(OH)₃
2Na₃PO₄ + 3H₂SO₄ = 3Na₂SO₄ + 2H₃PO₄

Answer 2

CH4 + 2O2 = CO2 + 2H2O (complete combustion of methane)

NaOH + H3PO4 = Na3PO4 + H2O (neutralization reaction between sodium hydroxide and phosphoric acid)

Fe2O3 + 3H2SO4 = Fe2(SO4)3 + 3H2O (reaction between iron(III) oxide and sulfuric acid)

CaO + 2H3PO4 = Ca3(PO4)2 + 3H2O (neutralization reaction between calcium oxide and phosphoric acid)

Base + Salt = Weak Base + Salt (when a strong base reacts with a salt of a weak acid, the salt may undergo hydrolysis and the resulting solution will contain a weak base)

Acid + Salt = Weak Acid + Salt (when a strong acid reacts with a salt of a weak base, the salt may undergo hydrolysis and the resulting solution will contain a weak acid)