A new cryoscopic micro-method for the determination of molecular weights

✍ Scribed by W.M. Smit; J.H. Ruyter; H.F.Van Wijk

• Publisher: Elsevier Science
• Year: 1960
• Tongue: English
• Weight: 688 KB
• Volume: 22
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)88232-x

✦ Synopsis

Fystsclr Chcnrzsch rnstztarrrt T N 0.. Ulrcchl (The Netherlands) (Reccrvcd May dth, rgsg)

INTItODUCTION

The known cryoscopic methods for the determination of molecular weights arc based on the determination of initial freezing or final melting points. These methods may give reliable results if solute and solvent form no solid solutions, the heat of dilution is ncgligiblc and solid and liquid are physically stable near the melting point. But thcrc is little or no mformation given as to whether these conditions are fulfilled or not.

The method described in this paper is based on the determination of a tcmperatureheat content curve (melting curve). This curve permits the calculation of molecular weights even when mixed crystals occur and the heat of dilution is not negligible. Further, it yields information as to whether the various equilibrium conditions are sufficiently approached.