AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
Al3+ + 3Cl- + 3Na+ + 3OH- = Al(OH)3 + 3Na+ + 3Cl-
Al3+ + 3OH- = Al(OH)3
Zn + H2SO4 = ZnSO4 + H2
SO3+ 2KOH = K2SO4 + H2O
KNO3 + NaCl = не пойдет
Na2SO3 + 2HCl = 2NaCl + H2O + SO2
Ba(OH)2 + KOH = не пойдет