Write the reaction equation: MgBr2-Mg (OH) 2-MgSO4-Mg (HSO4) 2-MgSO4-MgBr2

1) MgBr2 + 2NaOH = Mg (OH) 2 + 2NaBr (when magnesium bromide interacts with sodium hydroxide, magnesium hydroxide and sodium bromide are formed);

2) Mg (OH) 2 + H2SO4 = MgSO4 + 2H2O (when magnesium hydroxide interacts with sulfuric acid, magnesium sulfate and water are formed);

3) 2MgSO4 + H2SO4 = 2Mg (HSO4) 2 (when magnesium sulfate reacts with sulfuric acid, magnesium hydrogen sulfate is formed);

4) Mg (HSO4) 2 + 2NaOH = Na2SO4 + MgSO4 + 2H2O (when magnesium hydrogen sulfate reacts with sodium hydroxide, sodium sulfate, magnesium sulfate and water are formed);

5) MgSO4 + BaBr2 = BaSO4 + MgBr2 (when magnesium sulfate interacts with barium bromide, barium sulfate and magnesium bromide are formed).