Liquids A and B show partial miscibility below 24.5 0C. The critical concentration at the upper critical temperature is x = 0.38, where x = the mole fraction of B. At 22.0 0C the two solutions in equilibrium have x = 0.24 and x = 0.48, respectively, and at 21.5 0C the mole fractions are 0.22 and 0.51. Sketch the phase diagram. Describe the phase changes that occur when B is added to a fixed amount of A at 22 0C until x = 0.60