Calculate the overpotential needed to sustain a current density of 100 mA at a Pt/Fe/Fe²* electrode in which the current is limited only by the electrode kinetics? Assume io = 2.5×104 A
Q: 4. What is the capacitance of an empty parallel-plate capacitor with metal plates that each have an…
A: Capacitance is directly proportional to area and inversely proportional to distance
Q: Write the processes by which adsorption of electrolyte or ionic species at electrode surface take…
A: Interpretation: To write the processes by which adsorption of electrolyte or ionic species at…
Q: An unknown cadmium (II) solution was analyzed polarographically by the method of standard additions.…
A: Given : Mass of unknown sample = 25 ml i = 1.86 μA Concentration of Cadmium ion = 2.12 × 10 -3 M…
Q: The voltammogram for 20.00 mL of solution that was 3.65 x 10-3M in Cd2+ gave a wave for that ion…
A: Given: Volume of solution=20 mL Concentration=3.65×10-3 M Limiting current=31.3 micro Ampere
Q: In a whole-cell patch-clamp experiment at 32 degrees C, the intracellular solution contains 16 mM…
A: In a membrane, the reversal potential of an ion is the membrane potential at which there is no…
Q: Why heavier p- block elements shows variable electrovalency?
A: A lower value of oxidation state is obtained when only np electrons are lost. In the case of heavy p…
Q: At 25 °C, 0.05 M of MgCl2 electrolyte solution showed molar conductivity of 194.2 S cm? mol-. A cell…
A:
Q: a) The selectivity coefficient for a Bromide ion-selective electrode is K Br,OH 0.15. What will the…
A: please find the solution attached
Q: A fluoride ion-selective electrode has a selectivity coefficient KPot F2, OH2 5 0.1. What will be…
A: [F-] = 1 × 10-4 M, and Kpot.F-OH- = 0.1
Q: Significant evolution or deposition occurs in electrolysis only if the overpotential exceeds about…
A: The Tafel equation is an equation in electrochemical kinetics relating the rate of an…
Q: Convert the following potential. The reference electrode is saturated with KCI. 0.017 V (vs. Ag…
A: Given0.017V(vs. Ag|AgCl)= V (vs. S.C.E.)Potential for reference electrode saturated with…
Q: The conductivity of a 0.100 moldm-3 KCl solution at 25oC is 1.289 Scm-1. What is the resistance and…
A: Concentration of KCl solution (C) = 0.100 mol / dm-3 Conductivity of solution (κ) = 1.289 S cm-1…
Q: Calculate the potential of an alloy (Ni) electrode immersed in Ni(OH)2, pH = 9.00, Ksp = 6.5 ×…
A: In electrochemistry, electrode potential is the electromotive force of a galvanic cell built from a…
Q: The biochemistry that takes place inside cells depends on various elements, such as sodium,…
A: Given: Diameter of potassium ion channel = 0.30 nm Current carried in the channel = 1.8 pA…
Q: The exchange current density at the electrode Pt| Fe3+| Fe2+ is 2.4 x 10-3 A cm-2, How many…
A: The number of singly charged particles transported per unit time per unit area at equilibrium is the…
Q: An unknown cadmium(II) solution was analyzed polarographically by the method of standard additions.…
A:
Q: Calculate the effect that increasing the overpotential from 0.50 V to 0.60 V has on the current…
A: From Butler-Volmer equation, at large overpotential, the ratio of current densities (j1/j2) at two…
Q: The mobility of a Rb+ ion in aqueous solution is 7.92 x 10-8 m2 s-1 V-1 at 25 °C. The potential…
A: Drift speed: It is referred to the average velocity of free electrons colliding within the system…
Q: Provide as many error sources in your calibration of the ion-selective electrode (ISE) as you can.
A:
Q: molar
A:
Q: 5- Resistance of the 0.05 M solution placed between two Pt electrodes having surface area 10 cm' at…
A: Concentration = 0.05 M Surface area(A) = 10 cm2 Length (l) = 1.5 cm Resistance (R) = 50 ohm
Q: How many electrons or protons are transported through the double layer per second for each of the…
A:
Q: Calculate the measured current density for metal M when immersed in boiling water, it's found that…
A: Butter-Volmer Equation is one of the most fundamental relationships in electrochemical kinecics . It…
Q: Based on the following data for a Ca2+ ion-selective electrode, determine the slope (S) for the…
A: Given: At Ca2+ concentration of 10 ppm Voltage = -61. 0 V At Ca2+ concentration of…
Q: The boundary equivalent conductivity of the 0.1 M electrolyte with a resistance of 0.33 ohms was…
A: Given : Resistance of the cell = 0.33ohm Molar conductivity = 320Scm-2mol-1 Conductivity Ratio =…
Q: By how many volts will the potential of an ideal Mg2 ion-selective electrode change if the…
A: For this cell, 2 electrons are transferred. Also, we know, Change in Potential ((∆E) = E1 - E2…
Q: How does a compound electrode differ from a simple ion-selective electrode?
A: An electrode is a material that connects to the non-metallic part of a device such as semiconductors…
Q: Calculate the potential of a platinum electrode immersed in a solution of KBr 0.0100F and 1 x10-3F…
A: Reaction: Br2 (aq) + 2e- ↔ 2Br- Nernst equation: E=E∘ -0.0591nlogBr-2Br2
Q: A typical exchange-current density, that for H+ discharge at platinum, is 0.79 mA cm−2 at 25 °C. Use…
A:
Q: The following data were obtained when a Ca ion selective electrode was immersed in a series of…
A: Given: Concentration=2 M E=-22.5 mV
Q: The resistance of a decinormal solution of a salt occupying a volume between Pt electrodes is 1.80…
A: Normality of solution = 0.1 N Distance between electrode(l) = 1.80 cm Cross section area of…
Q: Is standardization against primary standard required for electrogravimetry using two electrode…
A:
Q: A potassium selective electrode indicates 24.5 mV response to a standard solution with [K*] = 0.200…
A: Given: Potential of electrode at 0.200 M K+ concentration = 24.5 mV And potential of electrode at…
Q: mechanism by which the potential of a platinum elect solution of Fe(II) and Fe(III) in 1 M HCl.…
A: Given: V=100mV 1 M HCl
Q: 2) Name the advantages of glass electrode in potentiometric measurements (please write correctly and…
A: Advantages of glass electrode in potentiometric measurements:
Q: From the Nerst equation E = EO + RT/nF In a. show that for a pH electrode that an uncertainty in the…
A: The Nernst Equation enables the determination of cell potential under non-standard conditions. It…
Q: What are the electrochemical technique used in fluoride ion-selective electrode?
A: Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions in…
Q: The same cell was used to study 0.100 M NH4CI (ag), and the measured resistance was 28.50 ohms.…
A: The molar conductivity of any solution is given as - Molar conductivity = (K x 1000)/M where, M =…
Q: The boundary equivalent conductivity of the 0.1 M electrolyte with a resistance of 0.33 ohms was…
A: Given : Resistance of the cell = 0.33ohm Molar conductivity = 320Scm-2mol-1 Conductivity Ratio =…
Q: A conductivity cell was calibrated using 0.01 M KCl (κ = 1.4087x10-3 S/cm) and the measured…
A:
Q: Calculate the potential (in V) of a zinc electrode immersed in 0.0200 M in NaOH and saturated with…
A: In this question we will find the potential of a zinc electrode in Volts(V). We are given E° of…
Q: 2.44 The molar conductivity of a 0.01 M weak acid (HX) at 298 K, measured in a conductivity cell…
A: The “Arrhenius theory of electrolytic dissociation” says that in aqueous solution, the electrolyte…
Q: explain types of reference electrode?
A: A reference electrode is an electrode which has a stable and well-known electrode potential. The…
Q: A cell with an internal concentration of potassium ion (K+ ) of 0.6 mol/L is placed in media with a…
A: Chemical potential is defined as the free energy change that arises on adding per mole of species…
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
- 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.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?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!
- 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) | AgThe sensitivity of a coulometer is governed by the delivery of its minimum current for its minimum time. Suppose that 5 mA can be delivered for 0.1 s.(a) How many moles of electrons are delivered at 5 mA for 0.1 s? (b) How many milliliters of a 0.01 M solution of a two-electron reducing agent are required to deliver the same number of electrons?Discuss the mechanism by which the potential of a platinum electrode becomes poised by immersion 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 experimental fact reflect thermodynamic considerations? How well do your answers to these issues apply to the establishment of potential at an ionselective electrode?
- 1. (a) Calculate Eo’ for the process:AgI03(s) + e- ⇔ Ag(s) + I0 3-(b) Use the shorthand notation to describe a cell consisting of a saturated calomel reference electrodeand a silver indicator electrode that could be used to measure pIO3.(c) Develop an equation that relates the potential of the cell in (b) to pIO3.(d) Calculate plO3 if the cell in (b) has a potential of 0.294 V.The exchange-current density for a Pt|Fe3+,Fe2+ electrode is 2.5 mA cm−2. The standard potential of the electrode is +0.77 V. Derive an expression for the current flowing through an electrode of surface area 1.0 cm2 as a function of the potential applied to the electrode; assume standard conditions.A bromine ion selective electrode has a selectivity coefficient K Br-, OH- = 0.05. What will be the change (absolute value in mV, NO UNITS, one figure after decimal point examples 3.3 or 33.0) in electrode potential when in 4.0 x 10-5 M Br" aqueous solution pH 6.0 is raised to pH 9.8 at constant temperature of 25 °C? Give answer as an absolute value in mV, NO UNITS, one figure after decimal point, examples 3.3 and 33.0 Answer:
- A 0.2g sample of toothpaste containing fluoride was treated with 50 cm3 of a suitable buffer solution and diluted to 100 cm3. Using a fluoride ion-selective electrode, a 25.00 cm3 aliquot of this solution gave cell potentials of –155.3 mV before and –176.2 mV after spiking with 0.1 cm3 of a 0.5 mg/cm3 fluoride standard. Calculate the pF– corresponding to each cell potential and the percentage by weight of fluoride in the toothpaste.Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed= mV/pH What is the theoretical slope at 30 *C? slope theoretical What is B, the electromotive efficiency, to three significant figures? B= What is the pH of an unknown that gives a reading of 50.2 mV with this electrode at 30 "C? mV/pHElectrochemical solutions of MY and MX2 were prepared by successive dilutions and their resistances were measured all from a conductivity cell. The following values were obtained at 25ºC. C(mol/L) 0,001 0,050 R para MX2/Ω 1669 37,14 R para MY/ Ω 4242 561 Knowing that this is a strong and weak electrolyte, answer:a) Which is the strong electrolyte and which is the weak electrolyte? Justify your answerb) Knowing that λ(Y2-)= 10.66 mS m2 mol -1 and λ(X-)=3.01 mS m2 mol-1 estimate the equilibrium constant of the weak electrolyte and the degree of ionization of an aqueous solution of this electrolyte a 0.050 mol/L at 25ºC. Conductivity cell data: molar conductivity=158.39 S cm2 mol-1 and R=4.62 for KCL 0.3 mol/L in the same cell in which the above electrolyte measurements were performed at 25ºC.
