At the cryohydric point 0 we have four phases in equilibrium at a definite pressure, temperature and composition of the liquid phase.
The curve OP represents the varying solubility of the hydrate as the temperature rises from the cryohydric point to 32.6°.
At B we have the non-variant cryohydric point at which ice, the hydrate Fe2C16 12H20, the saturated solution and the vapour are in equilibrium at 55° C. As the proportion 26 of salt is increased, the melting point of the con glomerate rises, till, at the -40 maximum point C, we have the pure compound the hydrate with twelve molecules ¦¦ 0.b, E, ?
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