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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: themichaelvoice on April 25, 2010, 02:54:18 PM

Title: Which Ka Values should be accepted?
Post by: themichaelvoice on April 25, 2010, 02:54:18 PM

Hello--

I performed an experiment in which I titrated three weak acids. I have multiple Ka values from each graph: before any NaOH was added, at the midpoint, and at the endpoint. A question for my lab writeup asks:

Is there any reason to accept one value over the others? Why?

I would assume that you would want the value that came at the beginning, because you haven't added any base yet, but I really haven't a clue why.

Please *delete me*

Title: Re: Which Ka Values should be accepted?
Post by: Borek on April 25, 2010, 05:32:03 PM

They differ in accuracy.