Zadanie 1
Na2CO3+2HCl--->2NaCl+H2O+CO2
2Na+ +CO3 2- +2H+ +2Cl- --->2Na+ +2Cl- +H2O+CO2
CO3 2- +2H+ --->H2O+CO2
Zadanie 2
FeCl2+2KOH--->Fe(OH)2↓+2KCl
Fe2+ +2Cl- +2K+ +2OH- --->Fe(OH)2↓ +2K+ +2Cl-
Fe2+ +2OH- --->Fe(OH)2↓
Zadanie 3
Ba(OH)2+2HBr--->BaBr2+2H2O
Ba2+ +2OH- +2H+ +2Br- --->Ba2+ +2Br- +2H2O
2OH- +2H+ --->2H2O