Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Chemistry Olympiad and other competitions => Topic started by: Sophia7X on April 10, 2012, 05:51:54 PM
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http://portal.acs.org/portal/PublicWebSite/education/students/highschool/olympiad/pastexams/CNBP_021762
the question I am having problems with is #5.
The answer is supposed to be B but I can only get A. I used the highest point on the graph (probably around 70 mL) but it didn't work.
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Approximate both left and right parts with a straight lines. Where do they cross?
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Approximate both left and right parts with a straight lines. Where do they cross?
oh, thanks! I didn't think to do that; I just drew a curve through the dots. 75 works.
On the same test, #35... why isn't this graph a diprotic acid?
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On the same test, #35... why isn't this graph a diprotic acid?
For a diprotic acid, if the first equivalence point is reached after adding x mol of NaOH, how much more NaOH do you need to add to reach the second equivalence point?
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So it's not diprotic because the second equivalence point would require 2x?
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Yes.