Ан
Андрей
3NaOH +CrCL3= Cr(OH)3 + 3NaCL
Cr(3+) +3OH- =Cr(OH)3
Cr(OH)3 +NaOH= NaCrO2 +2H2O
Cr(OH)3 +OH-=CrO2- +H2O
FeSO4 +2NaOH= Fe(OH)2 +Na2SO4
Fe(2+) +2OH-=Fe(OH)2
AlCL3 + 3NaOH= Al(OH)3 + 3 NaCL
Al(3+)+3OH-= AL(OH)3
AL(OH)3 +NaOH = NaALO2 +H2O
Al(OH)3 +OH-= ALO2 - +2H2O