D. A. MacInnes

A Magnetic Float Method for Determining the Densities of Solutions

A method for determining the densities of liquids is described in which a float containing a magnet is utilized. The conditions under which the submerged float would remain poised are found by adding weights and by observing the effect of currents through a solenoid. The method may be adapted to the measurement of the densities of solutions at a series of increasing concentrations by forming the solutions directly in the vessel containing the float.

A Study of Iodide‐Iodine Solutions with the emf Centrifuge

The potentials, observed with a galvanic cell with two iodide‐iodine electrodes, at two different radii in a centrifugal field, have been studied with solutions of potassium and sodium iodides, to which were added varying concentrations of iodine. Using a short extrapolation the transference numbers of sodium iodide have been obtained. The earlier results using potassium iodide have been confirmed. These results, when interpreted with the aid of conductance measurements, indicated the presence of the ionic complex I3−. A small deviation from the theory has been found with the results for sodium iodide‐iodine solutions. The emf centrifuge used in our earlier work has been simplified, and a galvanic cell has been utilized which avoids the collection of suspended particles on the electrodes.