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Questions tagged [electrochemistry]

The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using electricity (electrolysis).

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ZnO layer as a passivity layer

I have bought a zinc sheet and with SEM I can see a ZnO layer, which is a passivity layer. But when I connect this sheet to a conductive wire, le zn sheet is conductive too. Is that normal ? the ZnO ...
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453 views

Why does my voltaic pile produce a higher voltage then predicted?

In my chemistry class we are building our own voltaic cells and trying to produce as much current as possible with materials we are given using redox chemistry. My lab partner made a battery without ...
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3k views

Chemical Reactions at the Cathode of the Leclanche Cell

In the dry cell, the overall reactions that occur are: $$\textbf{anode:}~~~ \ce{Zn -> Zn^{2+} + 2e^-}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~$$ $$\textbf{cathode:} ~~\ce{2NH4+ + ...
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Why do we have surface charges on a polymer sheet immerged in water ?

I am working with a conductive polymer sheet where I have dropped off a drop of water (with ions). I have plugged the polymer with a conductive wire and an other wire is on the drop. With a voltmeter ...
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65 views

How does one optimize the molar concentration of electrolyte in terms of the rate of electrolysis?

There are many textbooks/recipes for various electrolyte solutions in the electrolysis of water. I know there is a minimum voltage to kick off electrolysis, and I'm supposing a minimum concentration ...
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838 views

Calculating Electrode Potential for Electrolytic Cell at Non-Standard States

Recently, I came across an interesting question that left me rather baffled. I was asked to calculate the minimum voltage required for the electrolysis of 1.0 M of NaCl in neutral solution using the ...
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189 views

What is the Gibbs Free Energy in Zinc Electroplating?

In zinc electroplating process, where zinc metal (anode) is deposited on an iron plate (cathode), there is no net equation. Then why do we need to apply voltage to the system to produce zinc metal on ...
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307 views

Reverse single replacement reaction

Is it possible using electrochemistry or some other method to reverse a typical single replacement reaction to go in the opposite direction. For example, is it possible to take silver metal and ...
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85 views

Why does copper and zinc connected by a wire in 6.0M NaOH become a galvanic cell?

For an experiment I placed two electrodes of copper and zinc connected by a wire in 6.0M NaOH. According to standard reduction potentials, there should be no reaction; however, the copper becomes ...
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82 views

The potential range of the cyclic voltammetry of CoCat in KPi made of D2O

I have a phosphate buffer adjusted to pH 7, and another phosphate buffer made of deuterium oxide (D2O) adjusted to pH 6.6 (pD 7). I want to conduct cyclic voltammetry of cobalt oxide catalyst in these ...
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34 views

How long does it take to turn aluminum smelters on and off?

This may fit better under "engineering," but I figured I'd start here. Aluminum is produced through an electrolysis process, and Wikipedia tells me that the electrolytic cells need constant power in ...
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495 views

Junction Potential at Each End of a Salt Bridge

I am having trouble with the concept of a junction potential as it relates to the salt bridge of an electrochemical cell. I understand that a junction potential occurs between two solutions of ...
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66 views

Hot-side and Cold-side rechargeable chemical compound

I am wondering if such a chemical/material exists which, upon triggering, becomes cold on one side and hot on the other in which after all the chemical bonds are broken/built (however it would work), ...
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329 views

Hydrogen Peroxide - Iron Nail Galvanic Cell?

I am planning to create a simple galvanic cell made up of common household materials. Suppose I have hydrogen peroxide (to serve as cathode), diluted in water, in one beaker, and I have a bunch of ...
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80 views

Calculating current for electrolysis process

Is there a way to calculate the current during electrolysis of a dilute NaCl solution. I need to oxidise the chloride ions to create hypochlorite ($\ce{OCl-}$), so I was thinking of using 2 inert ...
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44 views

Addition of anodes and cathodes in electrolysis

I am doing a research on the production of hypochlorite through an electrochemical cell using a brine feed. I know that using using an undivided cell would allow for the chlorine atoms that was ...
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145 views

Resistivity of pure water vs salt water for electrolysis

OK so I have a group project. Were "building" an ammonia plant. Part of the plan is to gather the $\ce{H2}$ we need from the splitting of pure water. We've been told $1000\ \mathrm{kg}$ of $\ce{NH3}$ ...
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77 views

Does aluminium (III) react with copper?

We all know know that Aluminium react with cupric producing Copper and Aluminium (III), but does Aluminium (III) react with Copper?
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245 views

Galvanic cell of copper and zinc

When we dip zinc metal in zinc sulfate solution, does zinc sulfate ionize into Zn and sulfate ions? Zinc ions come into the solution as Zn$^{+2}$ so why is the metal not completely dissociated? Why ...
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1k views

Trends in conductivity in groups 1 and 2

I have read that the trend for conductivity in groups 1 and 2 is a decrease down the groups (generally). Apparently this is because the atoms of each element get larger, so while the number of ...
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526 views

How to determine concentration of salt in a salt bridge

How do you determine as to what concentration of solution you need for a salt bridge in a galvanic cell? Do you even need a specific concentration in the first place?
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160 views

how a galvanic cell works with a different metal cation in electrolyte than used in electrode

A traditional galvanic uses zinc as the anode electrode submerged in a zinc sulfate electrolyte, and copper as the cathode electrode submerged in a a copper sulfate electrolyte. I wanted to know what ...
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235 views

Reduced Graphene Oxide (RGO) Conductivity vs Everything Else

Reduced Graphene Oxide (RGO), is the reduced version of Graphene Oxide (GO). Both RGO & GO are easily manufactured when compared to the complex process used to manufacture the 'atom-thick' ...
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958 views

Difference between using Zinc Nitrate instead of Potassium Nitrate for Salt Bridge Solution?

I have a lab question which asks "Suppose that before you began this experiment you ran out of your salt bridge solution of Potassium Nitrate and the only substitute available was zinc nitrate, would ...
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17 views

Gels that increase in volume

I would like to know if there are any gels that would increase in volume or swell due to electric field or current?!
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55 views

Would a redox reaction still happen between the two electrodes only connected by a wire?

The galvanic cell I'm studying has Pb as reducing agent and Cu as oxidizing agent, and as I understand it the reason that the electron flows from the Pb electrode to the Cu electrode without anyone ...
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47 views

Irreversible chemical reaction in a battery

"In reversible reactions, as the reactants react with other reactants to form products, the products are reacting with other products to form reactants." http://chemwiki.ucdavis.edu/Physical_Chemistry/...
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5k views

How to identify the anode and cathode in a concentration cell?

How do I understand which is the anode and which is the cathode in this problem? We have a concentration cell with hydrogen electrodes. It's made up of two half-cells. One half cell contains [BaCl(...
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104 views

Charging of galvanic battery

The oxydation-reduction reaction during the discharge of a galvanic battery is: Zn + Cu2+ = Zn2+ + Cu. During the charging phase, the reaction will be in the opposite way. An external source provides ...
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114 views

Supersaturated conversion of sodium acetate utilizing electricity

Is it possible to use electricity to take crystallized sodium acetate back to a supersaturated solution?
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1answer
139 views

Does Intercalation and Deintercalation of Lithium ions occurs in Half Cell?

The important feature of Lithium ion batteries is the ability to intercalate and deintercalate lithium ions in anode and cathode . However when we use half cell, using lithium metal foil as anode, ...
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103 views

Electrode/solution interface : What's the difference between the electrochemical Peltier heat and the heat caused from the overpotential?

In principle heat effects caused by the passage of an electric current might arise from: electronic peltier effect at the junction of electrode/solution level, Joule effect due to solution resistance, ...
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710 views

Cell voltage required for refining copper

If you put Zinc or Iron solids into aqueous copper (II) sulphate solutions, copper solids form spontaneously due to the fact, that Zinc/Iron oxides into ions more willingly than Copper does. And if ...
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1k views

What is the Difference between difference between Standard Electrode Potentials and Standard Reduction Potentials?

As the question suggests I am wondering the difference between standard electrode potentials and standard reduction potentials. I know that they are both a measure of the Voltage from certain ...
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86 views

Basis set in the computational software “Gaussian-03” for studying adsorption of a hydrogen atom on a carbon paste electrode dropcasted with Pt-CNT

What is the basis set in the computational software "Gaussian-03" that can be used to study the interaction of $\ce{H}$-atom with $\ce{Pt-CNT}$ dropcasted electrode? How can we study the energy ...
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447 views

How to determine limiting conductivity of specific ions?

Given a table with equivalent conductivity of certain electrolytes, how can I determine the conductivity of separate ions? I know that you can find the difference between for example $\ce{K+}$ and $\...
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610 views

Degree of dissociation of strong electrolytes in concentrated solutions of ionic substances

Why is the dissociation of strong electrolytes complete in very dilute solutions of ionic substances but less likely to be so in more concentrated solutions? Before seeing this, I thought a strong ...
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461 views

Fuel Cell Chart - Anode, Cathode, Electrolyte

Can someone please check my table to make sure I have the correct information. I am especially unsure of the parts highlighted in yellow:
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45 views

Relating Thermodynamic & Transport Properties to Electrochemical discharge curve

What are the fundamental thermodynamic & transport properties that the discharge cycle of a rechargeable battery with an intercalating cathode (like Li-ion) should depend upon? The few that I ...
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137 views

Height of potential barrier

Could anyone please help to find the height of the potential barrier between silver and copper or $\ce{Ag-Cu}$. I am working on a piezo-resistive sensor based on copper fabric and silver electrodes. I ...
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122 views

What is the relationship between migration and the potential of double layer theory?

Double layer theories like that of Gouy-Chapman give the electrostatic potential $\ \phi\ $ in solution. For a symmetrical electrolyte and small potential drops $\ \phi\left(x=0\right)-\phi\left(x\...
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124 views

Discrepancy in current inside an electrolytic cell

Suppose A(+)B(-) type fused salt is present in an electrolytic cell (not electrochemical cell). Let n electrons be entering the cell per second. Since each A(+) requires one electron to discharge, so ...
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1k views

Sulfuric Acid Resistance / Conductivity

I diluted sulfuric acid in deionized water in order to get a 10% $\ce{H2SO4}$ solution. I was going to use this solution as a cathode of a porous sample to measure its electrical properties. However,...
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37 views

Which ions determine ionic conductivity of a salt solution?

Let's take $\ce{ZnSO4}$ salt solution in water for example. So the ions inside my solution will be $\ce{H+}$, $\ce{OH-}$, $\ce{Zn^2+}$ and $\ce{SO4^2-}$. My questions are: Is the ionic conductivity ...
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1answer
5k views

Calculating the EMF of cell

Find the EMF of the following cell : $$\ce{Pb(s)}, \ce{PbSO_4}|\ce{SO_4^{2-}}(\pu{0.100M})||\ce{Pb^{2+}}(\pu{0.004M})|\ce{Pb(s)}$$ Given: $E^0_{\ce{PbSO_4|Pb,SO_4^{2-}}}=\pu{-0.359V}$ and $E^0_{...
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1answer
237 views

Lithium ion battery - measure C rate

How does one determine the C rate of an aged cell? I would like to find the discharge rate just before any cliff edge of capacity loss. Can the C rate of a cell be estimated by the cells rated heat ...
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1answer
18 views

Electrolytes in electrochemical half cells

In most of the examples in my book I have come across, the electrolyte for an electrochemical half cell has always been the aqueous version of the metal used. For example, a silver electrode is ...
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25 views

why is there a net current at halfwave potential?

Im wondering why there is a current measured at a halfwave potential? According to my understanding at the halfwave potential of a diffusion controlled reduction or oxiation at an electrode, there is ...
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68 views

Can I reverse an iron redox reaction with potassium hydroxide and electricity?

For a school project, about clean energy, me and my team are trying to build an iron battery. We are using a piece of iron (anode), potassium hydroxide (electrolyte), carbon electrode (cathode) ...
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33 views

Surface modelization of an electrode

I am trying to model the interaction between an electrode and a saline solution through an RC circuit. A reference electrode is placed in the saline solution to measure the voltage between the ...