Posted by poet on Monday, November 8, 2010 at 1:48am.
Correct on 1.
Correct on 2.
Correct on 3. To be a buffer, the solution must be a weak acid and its salt (conjugate base) OR a weak base and its salt (conjugate acid). Thus, adding a strong base, such as NaOH, to a weak acid, such as acetic acid, forms sodium acetate and you leave some acetic acid un-neutralized. (An xample of a weak base and its salt is aqueous NH3 and NH4Cl.)
A weak acid/weak base combination certainly has a pKa (both the weak acid AND weak base will hav a pKa). Strictly speaking, this combination does not follow the definition I gave above, however, certain weak acid/weak base combinations provide limited buffering in certain regions. For example, ammonium acetate, a salt of a weak acid and weak base, provides buffering in the 7.0 pH region.
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