Na2CO3+H2SO4=Na2SO4+CO2+H2O. Na2SO4+BaCl2+BaSO4+2NaCl
CuSO4+2NaOH=Cu(OH)2+Na2SO4. Cu(OH)2+2NaCl=CuCl2+2NaOH
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Na2CO3+H2SO4=Na2SO4+CO2+H2O. Na2SO4+BaCl2+BaSO4+2NaCl
CuSO4+2NaOH=Cu(OH)2+Na2SO4. Cu(OH)2+2NaCl=CuCl2+2NaOH