# Complete the following table table b calculated vs

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Complete the following table. Table B. Calculated vs Measured pHs for KHP Titration mL of 0.20 M NaOH added Calculated pH (from prelab) Measured pH (from titration curve) 0.00 4.17 4.17 4.25 4.25 10.00 5.41 5.41 4.74 4.74 15.00 5.88 5.88 5.17 5.17 20.00 9.20 9.2 9.35 9.35 22.00 11.98 12 11.54 11.54 In-Lab Question 3a. What is the experimental pK a value for hydrogen phthalate (HP or HC 8 H 4 O 4 ) that you found at the midpoint of your KHP titration curve? Label the pK a on each copy of your KHP titration curve. 4.74 4.74
In-Lab Question 3b. The accepted value for the pK a of HP is 5.408. How does this compare to your experimental value? What is their percent difference? %
In-Lab Question 4. 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, which of the following are true? (Select all that apply.)
Part C - Titration of Na 2 CO 3 with HCl Complete the following table. Table C. Titration of Na 2 CO 3 Concentration of Na 2 CO 3 solution 0.1004 0.1004 Volume of Na 2 CO 3 solution titrated 25.00 25.00 mL Concentration of HCl solution .1996 0.1996 Calculated first V eq of HCl solution 12.58 12.58 mL Calculated second V eq of HCl solution 25.16 25.16 mL M M
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