FeCl3+3Naoh= Fe(OH)3 +3NaCl Fe^+3 + 3Cl^-1 + 3Na+1 + 3OH^-1= Fe(OH)3 + 3Na^+1 + 3Cl^-1 NaOh +HBr= NaBr + H2O NaBr+NaOh-\-> реакция не идет CaCo3 + 2NaOh= Ca(OH)2 + Na2Co3