Given the following electrode systems and their electrode potentials Ca" +2e - Ca(s) É -- 2.87V Fein +2e - Fe(s) E --0.44v Iy +2e – 21 (m) Cr:0 E° -+0.54 V int14H' +6e 2C' +7H:O E-+1.33 V (i) Arrange the following species: Iz, Fe",Cr.0" and Ca in order of decreasing as oxidizing strength. (ii) What would be observed when granules of calcium are added to a solution of potassium dichromate? Write a cell diagram when the calcium and iron half cells are coupled and calculate the emf of the cell. Cell diagram: MeetLearn Cell e.m.f:

Given the following electrode systems and their electrode potentials Ca" +2e - Ca(s) É -- 2.87V Fein +2e - Fe(s) E --0.44v Iy +2e – 21 (m) Cr:0 E° -+0.54 V int14H' +6e 2C' +7H:O E-+1.33 V (i) Arrange the following species: Iz, Fe",Cr.0" and Ca in order of decreasing as oxidizing strength. (ii) What would be observed when granules of calcium are added to a solution of potassium dichromate? Write a cell diagram when the calcium and iron half cells are coupled and calculate the emf of the cell. Cell diagram: MeetLearn Cell e.m.f:

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter24: Coulometry

Section: Chapter Questions

Problem 24.4QAP: Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose...

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Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose that a cell was formed by immersing a silver anode in an analyte solution that was 0.0250 M Cl-,Br-, and I -ions and connecting the half-cell to a saturated calomel cathode via a salt bridge. (a) Which halide would form first and at what potential? Is the cell galvanic or electrolytic? (b) Could I- and Br- be separated quantitatively? (Take 1.00 l0-5 M as the criterion for quantitative removal of an ion.) If a separation is feasible, what range of cell potential could he used? (c) Repeat part (b) for I- and Cl-. (d) Repeat part (b) for Br- and Cl-.
The following cell was found to have a potential of —0.492 V: Ag|AgCl(sat’d)||HA(0.200 M),NaA(0.300 M)|H2(1.00 atm),Pt Calculate the dissociation constant of HA, neglecting the junction potential.
ELECTROCHEMISTRY: Calculate the required voltage (V) if an unknown metal (M) was electrodeposited from an aqueous solution containing M2X1 (where X is the anion) with a supplied current of 5.54 A for 11 h, consuming 0.1826 kWh of electrical energy. Assume that the current efficiency is 85%. (Input values only with 2 decimal places. Do not include the unit.)
Given the following: A cell SCE // Ag2CrO4 (saturated), CrO42- (xM) /AG is used for the determination of pCrO4- (ESCE = -0.244 V at 25 C). The half reaction at indicator electrode is: Ag2CrO4(s) + 2e-   2 Ag(s) + CrO42- (E0 = +0.446 V) What is pCrO4, given the cell potential of 0.402? What type of indicator electrode is Ag in this situation?
Will the equilibrium potential based on the reverse hydrogen electrode be 1.067 V or the same as the SHE of the equilibrium potential OER= 0.0591 V? If the medium is alkaline (0.1M KOH). by using the Nernst eqaution.
Many applications of electrochemistry have been in chemical analysis.Suppose a Fe|Fe2+ concentration cell is set-up in which the [Fe2+] = 1.0 x10¯2 M in one compartment but the concentration in the othercompartment is unknown. The Ecell was measured at 0.024V when thehalf-cells were connected.(i) Without doing a numerical calculation, is the unknown more orless concentrated than the 1.0 x 10¯2 M solution? Justify youranswer(ii) Calculate the unknown concentration.(iii) Does your calculated answer agree with your original answer?Why?
If a dilute H2 SO4 solution is electrolyzed with copper electrodes, the most likely electrode reactions are 2H ^ + + 2e- = H2 (g) at the cathode and 2Cu (s) + H2O = Cu2O (s) + 2H ^ + + 2e- at the anode. If we observe the formation of 27.4 cm3 of moist hydrogen (751 barometric torrs, 23.3 ° C) at the cathode, what change in weight will there be simultaneously at the anode? Data: Pv H2O 23.3 ° C = 22 torr.Atomic mass: Cu (65); O (16); H (1)