1) 2Cu + O2 = 2CuO
CuO + 2HCl = CuCl2 + H2O
CuCl2 + NaOH = Cu(OH)2 + NaCl
Cu(OH)2 = CuO + H2O
CuO + H2SO4 = CuSO4 +H2O
2) AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
2Al(OH)3 = Al2O3 + 3H2O
Al2O3 + 3H2SO4 = Al2(SO4)3 + 3H2O
Al2(SO4)3 + 6KOH = 2Al(OH)3 + 3K2SO4
Al(OH)3 + HCl = Al(OH2)Cl + H2O