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11 Nov 2019
5. Use the Pourbaix diagram for nickel (shown to the right) and the reduction potentials in Appendix 9 (found on Blackboard) to solve the following problems. Assume T = 298 K and [Ni2+] = 1 M Ni0z (a) Calculate the pH boundary between Ni2+ and Ni(OH)2, assuming that the Ksp for Ni(OH)2 is 6.0 x 10-16 +0.8 Ni +0.4 (b) What is the potential boundary between Ni and Ni2+? 0.0 Ni(OH)2 c) Derive the equation for the line between NiO2(s) and Ni2+(aq) in acidic solution. The equation should be in the form of E E (slope)pH. Confirm your answer by making sure it agrees with the Pourbaix diagram -0.4 Ni -0.8 0 24 6 80 12 14
5. Use the Pourbaix diagram for nickel (shown to the right) and the reduction potentials in Appendix 9 (found on Blackboard) to solve the following problems. Assume T = 298 K and [Ni2+] = 1 M Ni0z (a) Calculate the pH boundary between Ni2+ and Ni(OH)2, assuming that the Ksp for Ni(OH)2 is 6.0 x 10-16 +0.8 Ni +0.4 (b) What is the potential boundary between Ni and Ni2+? 0.0 Ni(OH)2 c) Derive the equation for the line between NiO2(s) and Ni2+(aq) in acidic solution. The equation should be in the form of E E (slope)pH. Confirm your answer by making sure it agrees with the Pourbaix diagram -0.4 Ni -0.8 0 24 6 80 12 14