47. The figure shows a steady-state microelectrode voltammogram of a neurotransmitter obtained in a solution of 0.1 M KCl at 10 mV/s. Which best describes this voltammogram? Current, i (A) 20 5 1.0 0.5 G.D 03 01 00 01 02 03 04 05 Potential, E (V) vs. Ag/AgCl (A) A scan-rate dependent oxidation wave with a cathodic limiting current of 2.0 nA and a standard oxidation potential of 0.20 V vs Ag/AgCl. (B) A scan-rate independent reduction wave with a

47. The figure shows a steady-state microelectrode voltammogram of a neurotransmitter obtained in a solution of 0.1 M KCl at 10 mV/s. Which best describes this voltammogram? Current, i (A) 20 5 1.0 0.5 G.D 03 01 00 01 02 03 04 05 Potential, E (V) vs. Ag/AgCl (A) A scan-rate dependent oxidation wave with a cathodic limiting current of 2.0 nA and a standard oxidation potential of 0.20 V vs Ag/AgCl. (B) A scan-rate independent reduction wave with a

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

Chapter25: Voltammetry

Section: Chapter Questions

Problem 25.14QAP

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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.
What is the cell potential of the following cell at 25C? Ni(s)Ni2+(1.0M)Sn2(1.5104M)Sn(s)
89. The differential pulse polarogram of 3.00 mL of solution containing the antibiotic tetracycline in 0.1 M acetate, pH 4, gives a maximum current of 152 nA at half-wave potential of -1.05 V. (vs S.C.E). When 0.500 mL containing 2.65.ppm of tetracycline was added, the current increased to 206 nA. How much tetracycline, in ppm, is in the original solution? A. 1.95 C. 0.76 B. D. 7.45 1.24
The following cell was found to have a potential of 0.2897 V:SCEIIMg2+(a = 3.32 * 10^-3M)membrane electrode for Mg^2+(a) When the solution of known magnesium activity was replaced with an unknown solution, the potentialwas found to be 0.2041 V. What was the pMg of this unknown solution?(b) Assuming an uncertainty of 60.002 V in the junction potential, what is the range of Mg21 activitieswithin which the true value might be expected?(c) What is the relative error in [Mg^2+] associated with the uncertainty in Ej?
In a polarographic experiment of a 60 mL of 0.08 M Cu2+solution, a limitingcurrent was left on for 15 minutes. If the average current during the time of theexperiment is 6.0 μA, what fraction of the copper is removed from the solution? TheFaraday constant is 96485 C/mol of electron.
2) A 90.00 ml solution, density = 1.0582 g/mL. with a AG = specif ic heat of 4.079 J/(GC), increased in temperature ΔΗ- from 20.36 C to 28.13 t with Al added. The copper collected, weighed 2.087 g. The electrochemical AS = potential mean was +1.821 volts. Calculate AG AH and AS for the reaction below. +3 2A (aq) +2 2 Als) * 3 Cuaq) 3 C46)
4. The %Mn in steel can also be determined spectrophotometrically by oxidizing the manganese to the intensely colored permanganate, MnO4-. Standard solutions of permanganate gave the following absorbances (in a 1 cm cell): ABSORBANCE CONC. OF MnO4 (g/mL) 0.210 1.05 x 10-5 0.315 1.61 x 10-5 0.429 2.21 x 10-5 0.599 2.98 x 10-5 0.801 4.04 x 10-5 The following samples of steel were thoroughly reacted to convert the manganese into permanganate and then diluted to 500.00 mL. WT. OF STEEL (g) ABSORBANCE 0.5886 0.611 0.3498 0.359 0.4555 0.482 Again using Excel, plot the calibration data and calculate the %Mn in the steel.
13.28 For the cell Pt,|Fe²*(a = 2.00), Fe**(a = 1.20):|I"(a = 0.100)|1½(s)|Ptg %3D %3D R (a) write the cell reaction; (b) calculate E298 assuming the net liquid-junction potential is negligible. (c) Which terminal is at the higher potential? (d) When the cell is connected to a load, into which terminal do electrons flow from the load?
47. The figure shows a steady-state microelectrode voltammogram of a neurotransmitter obtained in a solution of 0.1 M KCl at 10 mV/s. Which best describes this voltammogram? Current, i (A) 20 1.5 1.0 0.5 G.D 43 01 00 01 02 03 04 05 Potential, E (V) vs. Ag/AgCl (A) A scan-rate dependent oxidation wave with a cathodic limiting current of 2.0 nA and a standard oxidation potential of 0.20 V vs Ag/AgCl. (B) A scan-rate independent reduction wave with a cathodic limiting current of 2.0 nA and a standard reduction potential of 0.40 V vs Ag/AgCl. (C) A scan-rate independent oxidation wave with an anodic limiting current of 2.0 nA and a standard reduction potential of 0.20 V vs Ag/AgCl. (D) An irreversible scan-rate dependent oxidation wave with an anodic limiting current of 0.0 nA and unable to obtain its standard reduction potential with the information provided (D) The oxidized species formed in the reaction produce an insulating layer on the electrode surface. 50. Anodic stripping…
5) a) Typical Mg²+ concentrations in blood plasma are 2.2mM. If the transmembrane po- tential across the cell membrane is -90mV (negative inside), calculate the equilibrium con- centration of Mg²+ inside the red blood cell at 37°C. b) Consider the difference in electrochemical potential inside vs outside the cell, Aµreleefchem Helece/chem (inside) – Helec/chem(outside). As discussed in class, this difference is written as a chemical and electrical contribution, Afdee/chem = Aflchem + Atelec: For the red blood cell at equilibrium, state whether Atelee/chem; Atchem, and Aftelec are greater than, less than, or equal to zero, and explain your answer.
Subject Year Month, 58 Discuss the mechanism by which the potential of a platinum electrode becomes poised by immer- sion into a solution of Fe(II) and Fe(III) in 1 M HCl. Approximately how much charge is required to shift the electrode potential by 100 mV? Why does the potential become uncertain at low concentra- tions of Fe(II) and Fe(III), even if the ratio of their concentrations is held near unity? Does this ex- perimental fact reflect thermodynamic considerations? How well do your answers to these issues apply to the establishment of potential at an ion-selective electrode? Date. فصل دوم مراجع استاد
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!

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