Posted by AhmadM on Saturday, February 2, 2013 at 1:01am.
Dissociation is almost the same as ionization; for example, NaCl in H2O dissociates into Na^+ and Cl^-.
Acetic acid ionizes into
CH3COOH + H2O ==> H3O^+ + CH3COO^-
Association is the reverse of dissociation; i.e., positive and negative ions come together. An example is acetic acid associates, due to hydrogen bonding. As a result, the molar mass of acetic acid may be somewhere between 60 (when not associated) to 2x or 3x that number (120 or 180) especially in concentrated solutions. In some experiments I have done, the molar mass of acetic acid was 90 or the equivalent of about 2 molecules out of every 3 becoming associated. Hope this helps.
Thanks you Dr.Bob222.
So the overall idea is that dissociation decreases molar mass and association does the opposite when a solute dissolves in a solvent. (How do you identify if either reaction occurs? Just wondering.)
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