SOLUBILITY OF POTASSIUM CARBONATE IN WATER BETWEEN 384 AND 529 K MEASURED USING THE SYNTHETIC METHOD

The solubility of potassium carbonate in water at temperatures from 38 4 to 529 K is reported at the saturation vapor pressure of the solutio ns. Measurements were made using a visually-accessible apparatus consi sting of a platinum cell with sapphire windows and gold seals. The res ults indicate that potassium carbonate remains prograde-soluble up to 529 K. At approximately 427 K the hydrate form of the solid changes as indicated by visual observation of the solid and a change in the solu bility behavior. Solubilities determined at lower temperatures have be en compared with literature data and are in good agreement.