Make up the reaction equation: 1) SO3 – 2) H2SO4 – 3) Al2 (SO4) 3 – 4) Al (OH) 3 – 5) Al2O3

1) SO3 + H2O = H2SO4 (when sulfur (VI) oxide interacts with water, sulfuric acid is formed);

2) 3H2SO4 + Al2O3 = Al2 (SO4) 3 + 3H2O (when sulfuric acid interacts with aluminum oxide, aluminum sulfate and water are formed);

3) Al2 (SO4) 3 + 6NaOH = 2Al (OH) 3 + 3Na2SO4 (when aluminum sulfate reacts with sodium hydroxide, aluminum hydroxide and sodium sulfate are formed);

4) 2Al (OH) 3 = Al2O3 + 3H2O (when heated, aluminum hydroxide decomposes into aluminum oxide and water).