Abstract
Abstract A study was made of the isothermal molecular weight determination; the apparatus constructed and the procedure developed are described. An extensive investigation was carried out to provide reliable guides for the selection of the correct solvents and standard reference compounds to be used in the molecular weight determination. This study produced statistical evidence of the behavior, in five different solvents, of representative compounds from each of the following chemical groups: hydrocarbons, alcohols, ketones, esters, ethers, acids, nitriles, amines, and sulfides. Analysis showed that acetone and ethyl acetate are the best solvents if the composition of the sample is not known. Chloroform proved to be a good solvent except for samples in which hydrogen bonding could occur. n-Heptane was satisfactory for six of the eight types of compounds; benzene war. by far the poorest solvent
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