2NaOH+H2SO4 = Na2SO4 + 2H2O 2NaOH+CO2 = Na2CO3 + H2O 2NaOH+CuSO4 =Na2SO4 + Cu(OH)2 NaOH +HCl = NaCl + H2O H2SO4 + 2 NaOH --> Na2SO4 + 2 H2O CO2 + 2 NaOH --> Na2CO3 + H2O CuSO4 + 2 NaOH --> Cu(OH)2↓ + Na2SO4 HCl + NaOH --> NaCl + H2O 2 Na + 2 H2O --> 2 NaOH Na2O + H2O --> 2 NaOH 2 Na2O2 + 2 H2O --> 4 NaOH + O2↑ 2 NaCl + 2 H2O --электролиз--> 2 NaOH + Cl2↑ + H2↑ Ba(OH)2 + Na2SO4 --> BaSO4↓ + 2 NaOH