During an undergraduate junior/senior level inorganic chemistry class laboratory project synthesizing and studying various Co(III) complexes an error was discovered in one of the synthetic procedures found in an older laboratory manual. The procedure given in the manual does not produce the intended complex ion. The error was investigated by two undergraduate research students, and using their results the error was used to design a new open-ended project in inorganic chemistry that has strong elements of a research investigation that requires literature searching and laboratory experimentation.