Experiment 6 Ka of a weak acid (Spring 2017)
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1. (1 pt) We determined the equivalence point by interpolation of the 2nd derivative. In this and the next question you will enter the data pairs you used in the interpolation so I can check your math. Enter the Volume and 2nd derivative value, separated by a comma and without any units, for the last point prior to the equivalence point. For example, 20.42, 4.323. Do not use units or () -- just the pair of data.
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2. (1 pt) Enter the Volume and 2nd derivative value, separated by a comma and without any units, for the first point after the equivalence point. For example, 21.84, -3.338. Do not use units or () -- just the pair of data.
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3. (3 pts) What value for volume did you calculate by interpolation using the data pairs listed above? Express your answer to THREE places past the decimal, even though significant figures do not support such precision -- it is so I can compare my answer with yours. Include units this time.
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4. (1 pt) The next four questions refer to the point half-way to the equivalence point, where we determined pKa. Enter the Volume and pH value, separated by a comma and without any units, for the last point prior to the half-equivalence point. For example, 10.42, 4.03. Do not use units or () -- just the pair of data.
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5. (1 pt) Enter the Volume and pH value, separated by a comma and without any units, for the first point after the half-equivalence point. For example, 10.53, 4.17. Do not use units or () -- just the pair of data.
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6. (3 pts) What value for pH (pKa) did you calculate by interpolation using the data pairs listed in Questions 4 and 5, above? Express your answer to THREE places past the decimal, even though significant figures do not support such precision -- it is so I can compare my answer with yours. Values for pH or pKa do not have units.
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7. (2 pts) Re-write your pH (pKa) answer from Question 6 to the correct number of significant figures.
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8. (2 pts) What is Ka to two significant figures? Use Excel format (example: 5.5E-05), leaving no spaces.
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