Posted by bill on Wednesday, June 11, 2008 at 10:28pm.
For any titration you want a sharp change in pH at the equivalence point; therefore, you KNOW #3 can't be right.
I'm not sure what #1 means but I would assume sloping upward would mean a more or less gradual change from beginning to end; therefore, I wouldn't pick #1.
The equivalence point for the titration of a strong acid with a strong base is at pH = 7.0. Most indicators are good over a range of pH = 2 so an indicator changing at pH = 8.0 should be ok.
So, in one of those titration curves, when it looks like it is stretched out with one side sloping down and the other up, is that representing titration with a weak acid or base?
Here is a typical titration curve. Scroll down about half way on the page.
http://www.sparknotes.com/chemistry/acidsbases/titrations/section1.html
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