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? It is not that the properties change in nature but that their value is not well represented by equations like ΔT= K*m
The true values are ΔT= i*K*m where i is the van't Hoff coeffficient. For strong electrolytes and dilute solutions we assume that i is equal to the number of ions produced by the electrolyte according to its molecular formula. E.g. for dilute aqueous solutions of NaCl you have i=2. In reality i is a function of concentration and as concentration increases i deviates from the expected value (and becomes smaller)
One of the reasons is that the solvated ions can form pairs to a certain degree (Bjerrum pairs) and thus the total number of particles in solution is smaller than the expected.

2007-03-21 00:39:11 · answer #1 · answered by bellerophon 6 · 0 0

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