Write down the reaction equations: aluminum oxide – aluminum chloride – aluminum hydroxide – aluminum oxide

Let us write down the equations of the corresponding reactions:

1. Aluminum oxide, when interacting with a hydrochloric acid solution, gives aluminum chloride and water:

Al2O3 + 6 HCl = 2 AlCl3 + 3 H2O

2. The formed aluminum chloride reacts with ammonium hydroxide to form aluminum hydroxide, which precipitates in the form of a transparent gelatinous precipitate:

AlCl3 + 3 NH4OH = Al (OH) 3 + 3 NH4Cl

3. Aluminum hydroxide undergoes thermal decomposition at a temperature of 575 degrees and above. Decomposes into hydrogen oxide and water:

2 Al (OH) 3 = Al2O3 + 3 H2O