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Strong base is dissolved in 715 mL of 0.400 M weak acid (K, = 4.75 x 10-5) to make a buffer with a pH of 4.11. Assume that the volume remains constant when the base is added. HA(aq) + OH (aq) → H, O(1) + A-(aq) Calculate the pKa value of the acid, and determine the number of moles of acid initially present. pKa initial amount: mol HA When the reaction is complete, what is the concentration [A] ratio of conjugate base to acid? [HA] How many moles of strong base were initially added? amount added: mol OH-

Strong base is dissolved in 715 mL of 0.400 M weak acid (K, = 4.75 x 10-5) to make a buffer with a pH of 4.11. Assume that the volume remains constant when the base is added. HA(aq) + OH (aq) → H, O(1) + A-(aq) Calculate the pKa value of the acid, and determine the number of moles of acid initially present. pKa initial amount: mol HA When the reaction is complete, what is the concentration [A] ratio of conjugate base to acid? [HA] How many moles of strong base were initially added? amount added: mol OH-

Chemistry
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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Strong base is dissolved in 715 mL of 0.400 M weak acid (K, = 4.75 x 10-5) to make a buffer with a pH of 4.11. Assume that the volume remains constant when the base is added. HA(aq) + OH (aq) → H, O(1) + A-(aq) Calculate the pKa value of the acid, and determine the number of moles of acid initially present. pKa initial amount: mol HA When the reaction is complete, what is the concentration [A] ratio of conjugate base to acid? [HA] How many moles of strong base were initially added? amount added: mol OH-
Transcribed Image Text:Strong base is dissolved in 715 mL of 0.400 M weak acid (K, = 4.75 x 10-5) to make a buffer with a pH of 4.11. Assume that the volume remains constant when the base is added. HA(aq) + OH (aq) → H, O(1) + A-(aq) Calculate the pKa value of the acid, and determine the number of moles of acid initially present. pKa initial amount: mol HA When the reaction is complete, what is the concentration [A] ratio of conjugate base to acid? [HA] How many moles of strong base were initially added? amount added: mol OH-
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