上浒充通大粤 e SHANGHAI JIAO TONG UNIVERSITY Consider the case where B is added into A to form a solution. Liquid:ideal solution Solid:immiscible T→x Equilibrium:Pure solid A and solution AB at T' Solid A Solution AB A XB→ B A:pure solid--solution Fig.9.2 Plot of the activity of Aliquid AO TONG at T<TmA versus composition. A:pure solid-=pure liquid = solution Melting Dissolving L(T-T) △G=RTln A.soluion To a1.pure 7>1 Consider the case where B is added into A to form a solution. Liquid: ideal solution Solid: immiscible Equilibrium: Pure solid A and solution AB at T’ l pure l solution a a G RT . ,   ln Solid A Solution AB A: pure solidsolution A: pure solidpure liquid Melting m m melting ( - ) T L T T G  7 Dissolving  solution