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8 May 2018

64. Use standard free energies of formation to calculate AG° at 25°C for each reaction in Problem 62. How well do the values of AGⓇ calculated this way compare to those calculated from AH and AS? Which of the two methods could be used to determine how AGº changes with temperature?

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63. Use standard free energies of formation to calculate AGºat 25 °C for each reaction in Problem 61. How do the values of AGⓇ calculated this way compare to those calculated from AHⓇ and AS"? Which of the two methods could be used to determine how AGº changes with temperature?

how do the values of delta G compare to those calculated from delta H and delta S? which of these two methods could be used to determine how delta G changes with temp?

1. Use a scientific calculator to determine the [H⁺]eq from the pH values for each solution.

2. Use the obtained value for [H⁺]eq and the equation:

HC₂H₃O₂(aq) H⁺(aq) + C₂H₃O₂^â(aq)

to determine [C₂H₃O₂^â]eq and [HC₂H₃O₂]eq.

3. Substitute these calculated concentrations into the Ka expression you wrote in Step 1 of the Pre-Lab.

4. Compare your results with those of other students. What effect does initial HC₂H₃O₂ concentration seem to have on Ka?

-------

1. Calculate the pKa and the Ka using the results of your testing.

2. Find the accepted values for the pKa and Ka of acetic acid. How well do the accepted values compare with your calculated values? Explain.

3. Explain why the pH at the half-titration point is equal to the pKa in your experiment.

4. Explain how this test could be done using only an indicator solution and no electronic means of measuring pH.

Data:

Volume--- ph

0--1.23

10--2.49

11--2.68

12--3.15

13--3.36

14--3.54

15--3.77

16--3.95

16.5--4.05

17--4.15

17.5--4.28

18--4.43

18.5--4.67

19--4.96

19.5--6.38

19.55--9.87

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64. Use standard free energies of formation to calculate AG° at 25°C for each reaction in Problem 62. How well do the values of AGⓇ calculated this way compare to those calculated from AH and AS? Which of the two methods could be used to determine how AGº changes with temperature?

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