Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? [pka1], [pka2] pH 14 12- 10- 8- 6- 4- 2- 0- 20 60 40 Volume of NaOH (mL) O pka 11.3; pka 2 =4.0 pKa 1 = 2.1; pKa 2 = 6.2 O pka 1-6.2; pka 2 = 8.6 O pka 1 -6.2; pKa 2 = 8.6 80
Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2? [pka1], [pka2] pH 14 12- 10- 8- 6- 4- 2- 0- 20 60 40 Volume of NaOH (mL) O pka 11.3; pka 2 =4.0 pKa 1 = 2.1; pKa 2 = 6.2 O pka 1-6.2; pka 2 = 8.6 O pka 1 -6.2; pKa 2 = 8.6 80
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Titration Curve Explanation**
The image presents a pH titration curve of a diprotic acid. This curve helps in identifying the pKa values, which correspond to the points at which the acid is half-neutralized. The graph plots pH against the volume of NaOH (sodium hydroxide) added, measured in milliliters (mL).
**Graph Description:**
- The x-axis represents the volume of NaOH added, ranging from 0 to 80 mL.
- The y-axis represents the pH level, ranging from 0 to 14.
**Curve Characteristics:**
1. **First Inflection Point:**
- Occurs around 20 mL of NaOH.
- Corresponds to the first pKa value.
- pH approximately around 2.1.
2. **Second Inflection Point:**
- Occurs around 60 mL of NaOH.
- Corresponds to the second pKa value.
- pH approximately around 6.2.
**Given Options for pKa Values:**
- pKa 1 = 1.3; pKa 2 = 4.0
- pKa 1 = 2.1; pKa 2 = 6.2 (Correct)
- pKa 1 = 6.2; pKa 2 = 8.6
- pKa 1 = 6.2; pKa 2 = 8.6
The correct option is selected, indicating that the approximate values for pKa 1 and pKa 2 are 2.1 and 6.2, respectively.
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