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Unformatted text preview: should be around 13 and this would not be observed since the pH of the diluted NaOH is around this value. This is not the case here. Also, if the continued the titration till we have doubled the volume of NaOH after the observed first equivalence point, we would not observe a second rise. Hence the observed rise should be due to the loss of the third proton. Does the presence of small amounts of sodium citrate and sodium benzoate affect the shape of the curve? Doubtful. How can one confirm this? Run a titration curve with solid citric acid. The curve is similar. If one runs the titration with a suitably high concentration of citric acid, one should be able to see an initial sharp upward rise due to the presence of buffer chemicals, but the curve will have only one significant rise due to the loss of the third proton and the first two rises will not be seen....
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- Spring '10