In the Ostwald-Walker dynamic method, dry air is passed sequentially through a solution set and then a pure solvent set. What does the weight loss in each set correspond to?

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1. Loss in Solution set  $$\propto P_s$$  (Vapour pressure of solution).    2. Loss in Solvent set $$\propto (P^\circ - P_s)$$  (Lowering of VP).    3. Total Loss $$\propto P^\circ$$  .    Therefore, RLVP =  $$\frac{	ext{Loss in Solvent}}{	ext{Total Loss}}$$  .

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