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Ba2+ + 2Cl- + 2Na+ + SO42- ->BaSO4 + 2Na+ + 2Cl-
Ba2+ + SO42- ->BaSO4
2.Ca(NO3)2+K2CO3->CaCO3+2KNO3
Ca2+ + 2NO3- + 2K+ + CO32- ->CaCO3 + 2K+ + 2NO3-
Ca2+ + CO32- ->CaCO3