STUDIES IN THE SYSTEM CALCIUM-OXIDE–SULPHUR-DIOXIDE–WATER: III. PRECIPITATION TEMPERATURES

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Abstract
A technique is described for measuring the precipitation temperatures of the system calcium-oxide–sulphur-dioxide–water, and the results over a considerable concentration range are tabulated. It is shown that the presence of colloidal matter brings about a condition of supersaturation. The hydrogen ion and bisulphite ion concentrations for the solutions at the precipitation temperature have been calculated. It is suggested that the hydrogen ion concentration plays an important role in precipitation, and the copious nature of the precipitation with rising temperature above the precipitation temperature is explained.A table containing bisulphite ion concentrations over a large range of calcium oxide and sulphur dioxide concentrations, and over the temperature range 50–90 °C., is given. It is pointed out that the system calcium-oxide–sulphur-dioxide–water acts as a buffer solution so far as bisulphite ions are concerned.

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