H₂O-MgCl₂ equilibrium phase diagram. Phases at equilibrium for the chemical system H₂O-MgCl₂ are shown as a function of chemical composition (weight percent MgCl₂) and temperature at 1 atmosphere pressure. There are seven stoichimetric solid phases. On the diagram, two melt congruently, two melt incongruently, and the melting behaviors ot two are not shown. MgCl₂ melts congruently at 712°C. Peritectic and eutectic compositions and temperatures are shown on the axes. There is a chaotectic point between steam and MgCl₂^.H₂O at 192°C. Data sources for this diagram can be found in Brady (2009).    Return to Diagram List