Answered: A buffer made up of equal volumes…

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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A buffer made up of equal volumes (231.3 mL) of each of 0.656 M A H and 0.624 M A ^minus. What is p H of the buffer after addition of 5.61 mL of 0.266 M HCl? K a of H A is 2.190E-5.

Expert Solution

Step 1

Total volume of the buffer solution = 231.3 + 231.3 = 462.6 ml or 0.4626 L

The pK_a value of HA = 5 – log(2.19) = 4.66

Number of moles of HA = Concentration of HA (M) × Volume of HA (L)

Number of moles of HA = 0.656 M × 0.2313 L = 0.1517 mol

Number of moles of conjugate base (A^-) = Concentration of A^- (M) × Volume of A^- (L)

Number of moles of conjugate base (A^-) = 0.2313 L × 0.624 M = 0.1443 mol

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