The Determination of the Purity of Acetic Anhydride

Abstract

The -phenoxyhydracrylic acid obtained was purified by crystallization from toluene and from water, the usual crystallization from chloroform being omitted because of the small quantity in hand; the product formed needles melting at 102-106°; yield, 0.083 g. A mixture with an equal amount of the pure acid (m. p. 109-110°) melted at 103-106°.

An Apparatus and Procedure for Measuring Mutual Solubilities of Hydrocarbons + Water: Benzene + Water from 303 to 373 K

“…There are many published measurements for this system, and the agreement among these data is fair. From Figures 3 and 4, water solubilities measured by Berkengeim (24), Clifford (25), Rosenbaum and Walton (26) The water solubility data in Table 2 can be correlated with the following equation, as shown by the solid lines in Figures 3 and 4: ln(l/xw) = -1.557 -9.415 In (6) where x" is the mole fraction of water and is the system temperature divided by the critical temperature of water, 647.3 R. The uncertainty in the experimental data indicates this exponential correlation may be adequate, as shown in Figures 3 and 4. From eqs 2 and 6, the heat of the solution at 298.15 R is estimated as 23.3 kJ-moH from the solubility measurements.…”

The Crystal Structure of Arsenomethane

“…(19) K. Hedberg, E. W. Hughes and J. Waser, reported at the San Francisco, Calif., Meeting of the American Chemical Society, March, 1949. Houston, Texas [Contribution from the Richard Benbridge Wetherill Laboratory of Chemistry, Purdue University] The Solubility of Water in Aromatic Halides1 By James Wing2 and W. H. Johnston Received June 11,1956 The solubilities of water in benzene, toluene, fluorobenzene, chlorobenzene, bromobenzene, iodobenzene and o-dichlorobenzene were measured by an isotopic dilution technique using tritiated water as the tracer and counting as acetylene. Hildebrand's solubility formula was applied to the experimental results and values of the solubility parameter 2 were obtained.…”

An Efficient and Reliable Gas Chromatographic Method for Measuring Liquid-Liquid Mutual Solubilities in Alkylbenzene + Water Mixtures: Toluene + Water from 303 to 373 K

“…Water Solubility in Toluene. The solubility of water in toluene results together with those reported in the literature (25,(34)(35)(36)(37) are plotted as a function of temperature in Figure 4. Tarassenkow and Poloshinzewa (37) covered the same temperature range, and there is some disagreement between the two sets of measurements, particularly in the temperature dependence of the water solubility.…”