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- NERNSTIAN ELECTROCHEMISTRY PROBLEMS 10) Summarise the tests one would have to do to establish a cell was behaving reversibly.If an Ecell of 0.495V was noted when your cell was set-up. What is thesolution pH?Quinone undergoes a reversible reduction at a voltammetric working electrode. The reaction is (a) Assume that the diffusion coefficients for quinone and hydroquinone are approximately the same and calculate the approximate half-wave Potential (versus SCE) for the reduction of hydroquinone at an RDE from a solution buffered to a pH of 8.0. (b) Repeat the calculation in (a) for a solution buffered to a pH of 5.0.
- 1. Convert -0.916 V (on SCE. 1.0 N) to the SHE scale. 2. What is the potential on SHE scale, for an electrode which is at a potential of —0.920 V relative to a Ag/AgCl reference in 0.01 N KC1 at 25° C.You prepare a saturated LiF solution at room temperature and use a fluoride ion selective electrode to measure [F-] = 0.0429 M. What is the Ksp for this product?1) Calculate Delta G° for the overall reaction at 25.0 °C 2) Calculate the E° for the anode at 25.0 °C.
- Hittorf cells with silver-silver chloride electrodes were filled with HCl solution with a molality of 0.0106 mol / kg. 2 mA strong current flowed into the cell for 3 hours. At the end of the experiment, the solution at the cathode contained 51.7169 g water and 0.0267 g HCl. Find the transport numbers H + and Cl-Show detailed solution. A cell was prepared by dipping a Cu wire and a saturated calomel electrode into 0.10 M CuSO4 solution. The Cu wire was attached to the positive terminal of a potentiometer and the calomel electrode was attached to the negative terminal.(a) Write a half-reaction for the Cu electrode.(b) Write the Nernst equation for the Cu electrode.(c) Calculate the cell voltage.Write the Nernst equation2 for the reaction Cu2+ (aq) + Zn (s) ® Zn2+ (aq) + Cu (s) Let activity of Cu2+ equal to 1 and change the activity of Zn2+ such that Q is in the range - 0.001 to +0.001. Select different values of Q and for each calculate Ecell. Plot ?cell−?cellө vs ln Q. What is the effect of Q (that is the activity) on ?cell−?cellө ? Is the effect the same at higher and lower values of Q? what is the largest value of the absolute difference between cell potential and standard cell potential, |?cell−?cellө|? What do you expect the graph will look like for different number of electron transferred (n )? And why?
- A cell was prepared by dipping a Cu wire and a saturated calomel electrode into 0.10 M CUSO4 solution. The Cu wire was attached to the positive terminal of a potentiometer and the calomel electrode was attached to the negative terminal. (a) Write a half-reaction for the Cu electrode. (b) Write the Nernst equation for the Cu electrode. (c) Calculate the cell voltage.When measured with a Fion-selective electrode with a Nernstian response at 25oC, the potential due to Fin unfluoridated groundwater in Foxboro, Massachusetts, was 40.0 mV more positive than the potential of tap water in Providence, Rhode Island. Providence maintains its fluoridated water at the recommended level of 1.00 ± 0.05 mg F-/L. What is the concentration of F-in mg/L in groundwater in Foxboro? (Disregard the uncertainty.)An electrochemical cell is constructed using 0.50 M NiSO4 and a solid nickel electrode in one half cell and 2.0 M ZnCl2 and a solid zinc electrode in the other half cell. The cell is run at 25oC. What voltage would be expected from this cell? Enter the response to 2 significant figures.