The identification and characterization of the structures of unknown substances are an important part of organic chemistry. Each functional group has a particular set of chemical properties that allow it to be identified. water. Solubility in NaOH: Solubility in 6M NaOH is a positive identification test for acids. R..Identifying an unknown organic compound through a three-step process involving Chemical tests transform an unknown into a different compound with an .UNK.1. IDENTIFICATION OF ORGANIC UNKNOWNS. TECHNIQUES REQUIRED : Most of the techniques from Chem may be required. OTHER .Hints for identifying unknowns. Search Properties of Organic Compounds and The Combined Chemical Dictionary to find compounds whose physical and .