Co2(SO4)3 is not a valid chemical formula. It appears to be a combination of two separate compounds: CO2 (carbon dioxide) and SO4 (sulfate). Carbon dioxide is a colorless gas and sulfate is a polyatomic ion typically found in salts.
Al2SO43 is colorless in a water solution.
The systematic name for CO₂SO₄₃ is carbon disulfate. In this compound, carbon is bonded with three sulfate (SO₄) groups, indicating that there are three sulfate ions associated with one carbon atom.