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- For each of the following reactions, determine the overall balanced electrochemical reaction, its standard electric potential, and the standard Gibbs energy of the reaction. aCo+F2Co2++2F bZn+Fe2+Zn2++Fe c Zn+Fe3+Zn2++Fe d Hg2++HgHg22+A conductivity cell filled with a 0.01 M KCl solution was found to have a resistance of 189 ohms at 25oC. When filled with 0.01 M HCl solution, the cell gave a resistance of 64.8 ohms at the same temperature. At 25oC, the conductivity of 0.01 M KCl solution was 1.4088 x 10-3 S cm-1. Calculate (a) the cell constant and (b) the conductivity of the HCl solution. answer is [0.266; 4.105 x 10-3] please explain. thank you!Write the advantages of the glass electrode. (Please write it correctly and concisely.)
- Write the applications of the glass electrode. (Please write it correctly and concisely.)What is the schematic representation of a cell with a saturated calomel electrode as the reference electrode and a silver indicator electrode to measure the p-function of [CrO4²-]? SCE | Ag2CrO4(sat'd), CrO42-(x M)| Ag O SCE || Ag2 CrO4(s), CrO4²-(x M)| Ag SCE ||Ag2 CrO4(sat'd), CrO4²-(x M) | Ag SCE || Ag2CrO4(s), CrO4²-(x M) | AgA 0.10 M FeSO:(aq) solution is electrolyzed between a magnesium cathode and a platinum anode with a current density of 1.0 mA cm-2. The hydrogen overpotential is 0.65 V. What will be the concentration of Fe2+ ions when evolution of H2 just begins at the cathode? Assume all activity coefficients are unity. (E°(Fe2*/Fe) = -0.44V)
- Describe principle of a glass membrane pH electrode.At 25 °C, 0.05 M of MgCl2 electrolyte solution showed molar conductivity of 194.2 S cm? mol-. A cell with electrodes that 1.50 cm² in surface area and 0.50 cm apart is filled with the above electrolyte. Determine the resistance of the solution.8 6. For the cell Cd(Hg)|CDSO,. H,0(s)|Hg,SO,(s)|Hg the emf is given as a function of temperature t (°C), by the emprical expression E(V) = 1.01845 - (4.05 x 105)(t-20) - (9.5 x 10")(t-20)? Calculate the changes in the thermodynamic properties of free energy, entropy and enthalpy for the cell reaction at 25°C.
- The exchange current density at the electrode Pt| Fe3+| Fe2+ is 2.4 x 10-3 A cm-2, How many electrons are transported through the double layer per second in the cell (area of 1 cm2 each)? Estimate the number of times per second that a single atom on the surface takes part in an electron transfer event, assuming that the atom occupies 280 pm2 of the surface of the electrodeA voltaic cell is constructed in which the anode is a Mg|Mg²+ half cell and the cathode is a NiNi2+ half cell. The half-cell compartments are connected by a salt bridge. (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (ag) or (s). If a box is not needed, leave it blank.) The anode reaction is: The cathode reaction is: The net cell reaction is: In the external circuit, electrons migrate the NiNi?+ electrode the Mg|Mg?+ electrode. In the salt bridge, anions migrate the Mg|Mg-+ compartment A the NiNi<+ compartment.What would the potential of a standard hydrogen electrode (S.H.E.) be under the following conditions? [H+]=0.53 M?H2=5.0 atm?=298 K E = ............... V.