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Home :FAQ :Acids and basesPrint | Comment
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Is the salt of a weak acid and a weak base considered a weak acid or a weak base?

Is the compound iodopyracet aka Diadrast(used to measure renal function) a weak acid or a weak base??? I cannot find this information anywhere!!
Bonnie 10/07/99

Vocabulary
amine*
amino acid*
carboxylic acid*
weak acid*
weak base*
Here is the structure of iodopyracet, which is the salt of diethanolamine and 3,5-diiodo-4-pyridone-N-acetic acid: iodopyracet
The carboxylate group can accept H+ ions. If the pH is low enough, the anion can act as a weak base. The NH2+ group can yield hydrogen ions, so if the pH is high enough, it can act as a weak acid. So the answer to your question is that (like amino acids) iodopyracet can behave either way.

According to the Merck Index, aqueous iodopyracet solutions have a pH ranging from 5 to 8, depending on the concentration. Iodopyracet Injection (35% (w/v)), Diodrast Concentrated Solution (70% (w/v)), and Diodrast Compound Solution (40.5% (w/v), with 9.5% (w/v) of the diethylamine as well as the diethanolamine salt) are all neutral to litmus paper.

Author: Fred Senese senese@antoine.frostburg.edu



General Chemistry Online! Is the salt of a weak acid and a weak base considered a weak acid or a weak base?

Copyright © 1997-2010 by Fred Senese
Comments & questions to fsenese@frostburg.edu
Last Revised 08/17/15.URL: http://antoine.frostburg.edu/chem/senese/101/acidbase/faq/iodopyracet.shtml