1. A simple procedure of the semi-quantitative spectral analysis has been described. 2. This procedure consists in observing salt solutions fulgurated in a special fulgurator, with the electrodes reversed, i. e. the anode in the solution. 3. Accuracy and limit of application of this method were carefully studied and it was found that this is especially suited for the analysis of minute quantities of lithium, calcium, strontium and barium.
1. From the measurements on the partition of phenol between benzene and the aqueous solutions of neutral salts, it has been found that the following logarithmic law practically holds, (Remark: Graphics omitted.) Applying this to the equation of the chemical potential of phenol it becomes (Remark: Graphics omitted.) We have also obtained an equation of phenol distribution between benzene and water in the presence of neutral salts at 25°C: B=2.272×10βSC+37.71×103βSC3. 2. From the measurements of the freezing points of the aqueous phenol solutions in the presence of a neutral salt, it has qualitatively been proved that the chemical potential of phenol can be expressed in the following formula, X=Z0+αS+RTlnC and the activity coefficient of phenol is, therefore, to be expressed as (Remark: Graphics omitted.)
(1). The standard solution of oxalic acid should always be kept in a reagent bottle carefully wrapped with black paper. The solution thus preserved does not change its strength, irrespective of the presence or absence of sulphuric acid. Hence the old standard solution kept in a black bottle can as well used for titration. (2). The method of preservation of the oxalic acid solution, described in Treadwell’s “Analytical Chemistry” is not appropriate; the addition of sulphuric acid is not only unnecessary but objectionable, because the velocity of decomposition of the oxalic acid solution kept in a colorless bottle, becomes greater with the increase in the concentration of sulphuric acid added. (3). A convenient device for the correct reading of the burette is described.