Components:

(1) 3-Methylcholantrene, C₂₁H₁₆; [56-49-5] NIST WebBook
(2) Water, H₂O; [7732-18-5] NIST WebBook

Original Measurements

Davis, W. W.; Krahl, M. E.; Cloves, G. H. A.; J. Am. Chem. Soc. 1942, 64, 108-10.

Variables:

Ambient temperature: 27 °C

Prepared by:

M.C. Haulait-Pirson

Method/Apparatus/Procedure:

The method consisted of preparing serial dilutions of a suspension of (1) in (2) and determining nephelometrically the amount of (1) per unit volume beyond which further dilution caused no reduction in light scattering, which remained equal to that of pure (2). A Bausch and Lomb Dubosque colorimeter model 100-mm was employed. Many details are reported in ref. 1.

Source and Purity of Materials:

1. Hoffman La-Roche; used as received; m.p. range 175.3-177.1°C (cf. ref 2).
2. Dust-free.

Estimated Errors:

Ambient temperature: ±3°C
Mass concentration (m/v) (1): ±0.3 × 10^-6 g(1) dm^-3(2)

References

¹ Davis, W. W.; Parker Jr., T. V.; J. Am. Chem. Soc. 1942, 64, 101.
² Davis, W. W.; Krahl, M. E.; Cloves, G. H. A., J. Am. Chem. Soc. 1940, 62, 3086.