Achemist obtains 500.0 ml of a solution containing an unknown concentration of calcium iodide, cai 2. he pipets 20 ml of this solution into a 100 ml volumetric flask and dilutes to the mark. he then pipets 10 ml of this diluted solution into a 100 ml volumetric flask and dilutes to the mark. he analyzes some of the solution from the final volumetric flask and finds that the iodide ion concentration is 0.574 m. (note: in solution, calcium iodide breaks apart into one ca 2+ ion for every two i - ions, so a solution that is 1.0 m in cai 2 is 2.0 m in i determine the molar concentration of calcium iodide in the original solution.