Abstract
1. The rate at which sodium ions pass into solution when there is A siliceous film on the surface of vitreous sodium disilicate is determined by the diffusion of the ions in this film. 2. Increase in. the sodium ion concentration and decrease in the hydrogen ion concentration of the solution retards the diffusion of sodium ions in the film. At the same time, the rate of the dissolution of the film, which is secondary process, increases. 3. With increase in temperature, the rate of the diffusion of sodium ions in the film rises greatly. The rate of the dissolution of the siliceous film rises still more, so that with rise in temperature the leaching of the surface of vitreous sodium disilicate is replaced by the complete dissolution of the glass.
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