At the beginning (to), [Ca²+] = 0.01M, [H*] = 1M, [Hfo²+] = 2M. Consider the half-reactions below: Ca2* lag) + 2e → Ca(s) Ered = - 2.76 V HfO2* (ag) + 2H* (aq) + 4e → Hf(s) H201) E° red = -1.72 V Find the general reaction, E°cell, and identify the cathode and the anode. Indicate the direction of the flow of electrons (from which solid plate to the other solid plate). a. b. Write the line notation for this cell. c. Find AGO. *d. Express and calculate Q (at to) е. Express and calculate K. f. What value do you expect for Ecell at this point? Why? g. Find Ecell (at to) After a certain period of time (t), the H* concentration is one-fifth of its initial concentration. *h. Do the RICE and find the concentrations of all species at t1 i. Find the pH at t¡ in two different ways. *¥j. If no other species were in solution, what could be the pH and the concentration of H* at equilibrium? (No calculations needed) *¥k. If we were to redo the experiment at 310K. Would Ecell be larger, smaller or equal (than Ecell in the above situation) at to, t¡ and at equilibrium? (No calculations needed)
At the beginning (to), [Ca²+] = 0.01M, [H*] = 1M, [Hfo²+] = 2M. Consider the half-reactions below: Ca2* lag) + 2e → Ca(s) Ered = - 2.76 V HfO2* (ag) + 2H* (aq) + 4e → Hf(s) H201) E° red = -1.72 V Find the general reaction, E°cell, and identify the cathode and the anode. Indicate the direction of the flow of electrons (from which solid plate to the other solid plate). a. b. Write the line notation for this cell. c. Find AGO. *d. Express and calculate Q (at to) е. Express and calculate K. f. What value do you expect for Ecell at this point? Why? g. Find Ecell (at to) After a certain period of time (t), the H* concentration is one-fifth of its initial concentration. *h. Do the RICE and find the concentrations of all species at t1 i. Find the pH at t¡ in two different ways. *¥j. If no other species were in solution, what could be the pH and the concentration of H* at equilibrium? (No calculations needed) *¥k. If we were to redo the experiment at 310K. Would Ecell be larger, smaller or equal (than Ecell in the above situation) at to, t¡ and at equilibrium? (No calculations needed)
Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter17: Electrochemistry
Section: Chapter Questions
Problem 135CWP: Consider a galvanic cell based on the following half-reactions: a. What is the expected cell...
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