Bacl2...nacl...naoh...ca(oh)2...caco3...ca(hco3)2
BaCl2+Na2SO4=BaSO4+2NaCl 2NaCl+2HOH=2NaOH+Cl2+H2 электролиз 2NaOH+CaCl2=Ca(OH)2+2NaCl Ca(OH)2+CO2=CaCO3+H2O CaCO3+H2O+CO2=Ca(HCO3)2