Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2?the curve is attached below. The image displays a titration curve graph illustrating the change in pH as a function of the volume of NaOH added, measured in milliliters (mL). The x-axis represents the Volume of NaOH (mL) ranging from 0 to 80, while the y-axis denotes the pH level, which spans from 0 to 14.Key Features of the Graph:1. **Starting Point**: At 0 mL of NaOH, the pH is approximately 2, indicating an acidic solution.2. **First Buffer Region**: As NaOH is added, the pH gradually increases, demonstrating a gentle slope until around 20 mL.3. **First Equivalence Point**: A steep rise in pH occurs near 25 mL, indicating the neutralization of an equivalent amount of acid and base. The pH rapidly moves towards a more basic value.4. **Second Equivalence Point**: Around 60 mL of added NaOH, there is another sharp increase in pH, signifying a second equivalence point, where another significant neutralization event occurs.5. **Final Region**: Beyond this point, the curve levels off as more NaOH is added, reaching a pH close to 13, indicative of an excess of base in the solution.This graph is typically used in the context of acid-base titrations, demonstrating the titration of a diprotic acid with a strong base, such as sodium hydroxide (NaOH). The two equivalence points reflect the two stages of hydrogen ion donation by the diprotic acid.

The titration curve is the graphical representation of pH. The pH is greater than 7 for weak acid and strong base titration and the pH is less than 7 for strong acid and weak base titration.pKa is the value on the titration curve which represents the half equivalence point. The titration curve of a diprotic acid given in the image has approximate pKa values such as pKa1 = 5.2 and pKa2 = 10.9

Answered: 12- 10- 8- 6- 4- 2- 0- 20 40 60 80…

Science

Biochemistry

12- 10- 8- 6- 4- 2- 0- 20 40 60 80 Volume of NaOH (mL) Hd

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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