6 способов получения гидроксидов
2Na + 2H2O = 2NaOH + H2
Na2O + H2O = 2NaOH
CaCl2 + 2NaOH = Ca(OH)2 + 2NaCl
4Fe(OH)2 + O2 + 2H2O = 4Fe(OH)3
FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl