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Determination of molecular weights with a semi-micro-ebulliometer

✍ Scribed by J. G. van Pelt

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
202 KB
Volume
80
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

The semi‐micro‐ebulliometer consists of two units in a solvent vapour thermostat. The temperature difference is measured by two thermistors (readings of 3.10^βˆ’4Β°^. accurate to 1%). One determination takes 20 minutes. Light‐sensitive compounds are protected by a clear varnish. Decomposition, if not completed within 2 minutes, is indicated by a bent curve.

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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