This further investigation1 was undertaken to confirm the existence of certain hydrates of magnesium nitrate; and to determine methods of preparation of these salts for calorimetric and vapor pressure measurements, which are being made in this Laboratory. Malquori2 investigated this system at 20°, but gives only fragmentary data up to 59.38% nitric acid.
ExperimentalThe procedure was to make saturated solutions, and to analyze both the solution phase and the moist crystal phase for nitric acid and for zinc nitrate.Materials.-C. p. magnesium nitrate was prepared as previously described.1 C. p. nitric acid was prepared by distilling from a mixture of two volumes of sulfuric acid and one volume of nitric acid. The distillate was redistilled in a still having a long fractionating column and a controlled reflux. The fraction distilling over at 82°was collected. This brown acid which distilled over was decolorized by blowing dry air through it at 70 °. The acid thus purified analyzed 99-100% acid. A good grade of distilled water was used.Preparation of Saturated Solutions.-Mixtures" of the proper concentrations were made by weighing out requisite amounts of the three constituents. These were placed in two ounce tincture bottles having carefully ground glass stoppers. These bottles were then sealed with paraffin. The samples were then revolved in a water-bath at 25 =<= 0.020 for six hours. The concentration did not change after the third hour. The
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