Density of Heavy Water
THE density of heavy water was accurately determiner oy Stokland, Ronaess and Tronstad1 rature range 10–27°. Measurements fed to 50° by Chang and Chien2, and later by Wirtz3. Recently, we have further extended the measurement up to the boiling point of heavy water.
Ionization of strong electrolytes. IX. Proton magnetic resonance in the ternary system HNO3-DNO3-H2O-D2O
Nuclear magnetic resonance (NMR) was previously established as a reliable method for the determination of the degree of dissociation. The proton magnetic resonance shift has been measured in the full range of the ternary system HNO3—DNO3—H2O—D2O. The two nitric acids are about equally strong at 32°C, but at 0° deuteronitric acid is weaker, at 63° stronger than HNO3.
The Compressibility of Solutions of Three Amino Acids
The compressibility of aqueous solutions of glycine, α‐amino butyric acid, and e‐amino caproic acid have been measured over the concentration range up to 2.5 N at 25° and 75°C and up to a maximum pressure of 8000 kg/cm2. The results are exhibited in tables giving the volume in cm3 as a function of pressure, temperature, and concentration of that amount of solution which contains one gram of water, and in figures showing the apparent molal volume at 25° as a function of pressure and concentration. The general character of the results is complicated; the most striking result is that at low pressures the apparent compressibility of the acid in solution is positive, which is opposite in sign from all other known solutes. A connection is probable with the high dielectric constant. Other qualitative aspects of the phenomena are discussed.