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By using Alizarin red S in order to formation. Onium species for Co+2 ion extracted into Cloud point layer from acidic HCL Solutions, all studies about Select the optimum conditions for separation illustrated 100 µg Co+2 ion it should be present in 10 mL aqueous solutions with 0.3M hydrochloric acid HCl , So that 1x10−4 M alizarin red, 0.8 mL Triton X-l00, with heating the solution in electrostatic water bath at 80 C° for 15 min, until formation best cloud point layer to give higher extraction efficiency of Co+2 ion as onium species, because this extraction method as thermodynamic application show up thermodynamic Data of extraction was ΔHex = 0.0814 k J mol−1, and ΔGex = −61.85 k J mol−1, ΔGex = 175.443 J mol−1 k−1. As well as this application includes studies about some effective parameters, such as existences electrolytes interferences, kind of surfactants, and kinds of organic Reagents. [ABSTRACT FROM AUTHOR]