Pk a 520 question 3b the accepted value for the pk a

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pK a = 5.20
Question 3b. The accepted value for the pK a of HP 1- is 5.408. How does this compare to your experimental value? What is their precent difference?
Question 4. Select all of the following that are true based on your endpoint indicated by the phenolphthalein and the equivalence point determined by the titration curve for your KHP titration using the pH electrode. the phenolphthalein was necessary otherwise the equivalence point would have been missed the phenolphthalein changed color rapidly before the pH changed rapidly the endpoint and the equivalence point occurred together the phenolphthalein changed color rapidly as the pH changed rapidly the phenolphthalein changed color rapidly after the pH changed rapidly the phenolphthalein was not necessary since the pH change indicated the equivalence point Data Table C (Table D in new lab manual). Titration of Na 2 CO 3 Concentration of Na 2 CO 3 solution .1004 M Volume of Na 2 CO 3 solution titrated 20.00 mL Concentration of HCl solution .2012 M Calculated first V eq of HCl solution 9.98 mL Calculated second V eq of HCl solution 19.96 mL Question 6a.

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