Răspuns:
a)(EM) 2NaOH+ H2SO4=2H2O +Na2so4
(EIC)2Na++OH-+2H++SO42-=2H2O+2Na++SO42-
(EIR)OH-+2H+=2H2O
b)(EM) BaCl2+Na2so4=BaSo4+ 2NaCl
(EIC) Ba2++2Cl-+ 2Na++So42-= BaSo4+2Na++2Cl-
(EIR) Ba 2+SO42-=BaSo4
C)(EM) 2HCl+ Na2co3= Co2+H20+2NaCl
(EIC) 2H++2Cl-+2Na++CO32-=Co2+H2o+2Na++2Cl-
(EIR)2H++CO32-=CO2+H20
D)(EM) Na2So4 +2HCl= 2NaCl+H2SO4
(EIC) 2Na++So42-+2H++2Cl-=2Na++2Cl-+2H++So42-
(EIR) —