摘要:

The conductances, densities, and viscosities of solutions of silver nitrate and of ammonium nitrate, at 25 °C., have been determined at concentrations ranging from 0.1 Nto saturation (about 9 and 11 Nrespectively). By way of comparison, the same data have been obtained for the weak electrolyte acetic acid, up to 99.7% by weight concentration. It is shown that the weak electrolyte, at these concentrations, deviates even more from the Ostwald dilution law than do the strong electrolytes. Various attempts have been made to correct the conductance for viscosity. In addition to the older methods, two new attempts have been made, viz.; sugar was added toN/10 silver nitrate (used as the basis for these calculations) until its viscosity became equal to each of the silver nitrate solutions in turn. The conductance of aN/10 silver nitrate solution containing enough sugar to make its viscosity exactly equal to that of any given silver nitrate solution was used in the evaluation of the conductance ratio. Again, the viscosities of silver nitrate solutions at different temperatures were determined and the conductance found at the temperature at which the viscosity had become equal to that ofN/10 silver nitrate at 25 °C. This conductance was used as the numerator in the conductance ratio. All attempts, however, resulted in "overcorrection", that is, in an apparently increasing equivalent conductance, with increasing concentration, after a certain concentration is reached. It is shown that a remarkable agreement exists, in the case of ammonium nitrate, with the Walden modification of the Ostwald formula.

ISSN:1923-4287    

DOI:10.1139/cjr50b-009

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

Six benzophenones and their corresponding benzohydrols have been prepared. The former were obtained through the extension of a method employed by Boeseken for the preparation of benzophenone dichloride by the action of carbon tetrachloride on benzene in presence of anhydrous chloride. The ketones obtained were subsequently reduced in good yields to the corresponding hydrols by means of aluminum isopropylate. Some of these compounds have been found to possess insecticide properties.

ISSN:1923-4287    

DOI:10.1139/cjr50b-010

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

The rates of oxidation of titanium powder and sintered bar have been investigated in the temperature range 25° to 550 °C. at pressures of 2 and 20 cm. oxygen maintained constant throughout each experiment. It has been shown that the oxidation process can be divided into two mechanisms, viz., the formation of a thin surface film and diffusion of oxide into the metal. The surface film formation at low temperatures follows the logarithmic equation:on vacuum annealed metal surface. The diffusion process at higher temperatures is described by the equation:after the initial oxidation. This equation leads to preliminary values of the diffusion constant of the order of 10 × 10−8 cm2. per min. in the temperature range 463° to 565 °C.

ISSN:1923-4287    

DOI:10.1139/cjr50b-011

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

β-Aroyl-α,β-diphenylpropionic acids have been prepared in good yields from diphenylsuccinic anhydride either by the Friedel–Crafts' or by the Grignard reaction. The latter served also for the determination of the orientation of the acids produced in the Friedel–Crafts' reactions. Reduction of the aroyl acids was studied using the Clemmensen, high pressure hydrogenation and Meerwein–Ponndorf methods.

ISSN:1923-4287    

DOI:10.1139/cjr50b-012

出版商:NRC Research Press    

年代:1950

数据来源: NRC