Components:

(1) Acetonitrile, C₂H₃N; [75-05-8] NIST WebBook
(2) Trichloromethane, CHCl₃; [67-66-3] NIST WebBook

Original Measurements

Ott, J. B.; Woodfield, B. F.; Guanquan, C.; Boerio-Goates, J.; Goates, J. R.; J. Chem. Thermodyn. 19, 177-84 (1987).

Variables:

Ambient temperature: 182 - 228 K

Prepared by:

V.P. Sazonov

Method/Apparatus/Procedure:

The synthetic method was used. The freezing-temperature apparatus has been described previously¹ but the temperature -measurement system is new. Temperatures were measured with a Leeds and Northrup platinum resistance thermometer and with a Solartron Model 7081 digital multimeter which has a sensitivity on the 100 Ω scale of 10 μΩ. The multimeter used a 1 mA current for measurements of resistance less than 100 Ω. The resistance meter was interfaced to a Hewlett-Packard Model 9845C computer through an IEEE bus. The computer read and stored a resistance measurement every 4 s from which cooling and warming curves of time against temperature could be constructed. The computer could be signaled to record visual melting temperatures during the recording process. The results were continually plotted on a video monitor, recorded on disk, and eventually plotted to provide a permanent record of the time-against-temperature cooling and warming curves.

Source and Purity of Materials:

1. MBC Omnisolv; purified by fractional distillation in a vacuum-jacketed 2 m column packed with glass helices and operated at a reflux ratio of approximately 100; purity 0.9998 mole fractions; melting point= -43.87°C.
2. Fisher; reagent grade; purified by fractional distillation in a vacuum-jacketed 2 m column packed with glass helices and operated at a reflux ratio of approximately 100; care was taken to exclude light and to use it soon after the purifications since

Estimated Errors:

Ambient temperature: ±0.05 K.

References

¹ Goates, J. R.; Ott, J. B.; Budge, A. H.; J. Phys. Chem. 65, 2162 (1961).