1. The oxidation velocity of stannous hydroxide suspended in sodium carbonate solution of various concentrations by means of air was studied. The oxidation velocity was independent of the quantity of stannous hydroxide. 2. The effect of the concentration of sodium carbonate on the reaction velocity was small. 3. It was ascertained that sodium stannite is oxidized rapidly, while stannous hydroxide is oxidized very slowly by means of air. 4. The effect of temperature on the reaction was small.
1. The conductances of aqueous solutions of nickel sulphate at concentrations 0.0001 to 1 equivalent per liter at 25°C. and 18°C. were measured and the equivalent conductances at infinite dilution were found. 2. The ionic conductances of nickel also were calculated. 3. The relative viscosity and the degree of ionization of 1/20 mol nickel sulphate were calculated.