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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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3answers
94 views

How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
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1answer
34 views

Kohlrausch Law and conductivity

Im writing up a lab report at the minute and part of it concerns ions in solution and how they affect conductivity. I've been doing lots of reading and I think ive got the grasp of most of it, but its ...
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1answer
22 views

How does the molarity of the electrolyte solution affect the mass of copper formed on the cathode in the electrolysis of CuSo4? [on hold]

I'm struggling with a chemistry assignment, as I have to calculate the efficiency of an electrolysis solution, where I am given the Molarity of the electrolyte solution. Does anyone know how to ...
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0answers
16 views

I would like to DIY anodize aluminum [on hold]

I have a question about the byproduct of anodizing at home. If chemicals such as acid etc are neutralized. Is any of this by product dangerous if anodizing aluminum? I know that stainless steel ...
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0answers
42 views

Applicability of electrochemical equations [on hold]

Whenever I read most any electrochemical text there are many many equations. PDE's of diffusion, Debye-Hückel theory, etc... I was wondering how often do working electrochemist use all these equations ...
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1answer
41 views

How does solution which electrodes are immersed in effect electrode potential?

There was this question I had to do on which went like "which all metals can we not extract using electrolysis from aq soln" the answer involved the effect of solvent on electrode potentials, can ...
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0answers
26 views

question about experimental setup [closed]

Currently I am in the design process of a system which is similar to a basic parallel circuit setup with a power source etc. I will be using two separate endothermic reactions. My aim is to design a ...
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1answer
22 views

Standard Reduction Potentials and Electropositivity

I was looking through a table of standard reduction potentials and the trend seemed like it correlated with electropositivity. Is it reasonable to qualitatively compare two metals to see which has a ...
4
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1answer
64 views

What is the electrochemical reaction of this battery?

I've watched a YouTube video "Soda Can Battery - Power From Trash - DIY Project" by Source Port Services. I understand that the anode can be oxidised, but what is the reduction reaction at the cathode?...
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0answers
32 views

Boiling nitric acid and gold plating

I was watching a YouTube video "Home Brew Gold Plating" by Cody'sLab and had a few questions. In the video to dissolve the gold first he creates a mixture of $\ce{HCl}$ and $\ce{HNO3}$ (aqua regia). ...
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0answers
16 views

calculate the enthalpy of solution for ammonnium chloride [closed]

What is the change in temperature when 3.00 grams of ammonium chloride is dissolved in 100 mL of water? change is temp was -1.99 Given the change in the temperature from adding 3.00 grams of ...
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0answers
23 views

Can salvaged Nickel Metal Hydride from NiMH batteries be used in Nickel Plating?

In my understanding of nickel electroplating, nickel is used as the anode and it is also dissolved in an electrolyte to form nickel ions, which eventuallly deposits onto the cathode. I don't know the ...
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2answers
36 views

Equilibrium of an electrochemical cell [closed]

I am quite new to the field. So try to figure out what is meant by the equilibrium state of an electrochemical cell? Is it, where both half cells passing the same number of electrons to either side? ...
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1answer
29 views

Electrolysis of calcium hydroxide in glycerol [closed]

Calcium hydroxide is soluble in glycerol. Assuming anhydrous conditions, could such a solution be electrolysed to yield calcium metal, or would glycerol OH groups interefere with the process?
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1answer
40 views

Feasibility of using ionic liquid fuels in an MHD type reactor

First off I would like to say that my knowledge on chemistry, even general chemistry, is basic if not poor. That said, I have some intuituions on this matter. I haven´t found any paper regarding ...
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1answer
23 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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1answer
97 views

Why would water, and not saltwater, undergo electrolysis?

I am attending a cram school and there was a question that goes: Electrolysis decomposes chemicals by passing an electric current through a liquid or solution containing ions. Which of the ...
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2answers
12k views

Derivation of relationship between Gibbs free energy and electrochemical cell potential

Why is $\Delta G=-nFE?$ I don't understand what the motivation is behind this definition. Was it derived or just given? The textbook provides no justification for this equation. In fact, much of the ...
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0answers
20 views

Where does ΔG = -nFE come from? [duplicate]

The relationship between the changes in Gibbs energy and cell potential is given by, $$ \Delta G = - nFE $$ I can't seem to find a derivation of this expression. The books I've looked at just state ...
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1answer
43 views

Energy required for obtaining required mass of aluminium from alumina via electrolysis

How do I know how much energy I need to obtain 20 g alumunium from alumina with 5 V? I calculated the quantity of electricity is 2.22 F. Any help appreciated!
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1answer
33 views

Ponderomotive Effect on Ionic Liquids

Would an alternating electric field cause net motion of ions in a liquid in the case of the electrodes being placed outside the liquid? Generally speaking, what happens if you apply an external ...
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1answer
42 views

How to know which reduction and oxidation reactions occurred?

We just had a lab experiment on galvanic cells and we used 0.5 M and 1 M iron(III) nitrate solution at the anode (iron electrode) and 1 M and 0.5 M copper(II) nitrate solution at the cathode (copper ...
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2answers
143 views

Does reduction/ oxidation take place separately at a half cell electrode?

In the redox reaction chapter, we learn that oxidation and reduction go hand in hand. The oxidising agent oxidises by accepting the electron released by the reducing agent and gets reduced in the ...
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1answer
83 views

Cause of imaginary part of Warburg element in EIS

In electrochemical impedance spectroscopy experiments (EIS) the diffusion of electroactive species at flat, macroscopic electrodes is commonly described by the Warburg element with the impedance ...
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2answers
77 views

Troubleshooting electrochemical batteries

For my science classes, I have built multiple types of electrochemical batteries utilizing oxidation-reduction reactions, and I have demonstrated that they each produce potential difference across the ...
2
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2answers
124 views

What determines the speed of charging of a battery?

I was told on physics.stackexchange that this question belongs to Chemistry, what do you think? Recently we have seen the surge of superfast mobile phone charging. Just an example: http://www.bbc.com/...
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1answer
32 views

Reduction potential as a function of pH

I have read that Latimer diagrams can be represented both in an acidic medium (pH = 0) and in a basic medium (pH = 14). I would like to know how to calculate the reduction potentials as a function of ...
2
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1answer
53 views

What is the interaction between dissolved ions of opposite valence in a solution at rest?

NaCl is dissolved in water. Ions sodium and chloride are sufficiently free from each other so that they may occupy different regions of the solution after an active transport process through a ...
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0answers
33 views

Help understanding Electrochemistry diagram

I was reading some literature when i came across the following figure and was wondering if someone could help explain it to me. I see on the vertical axis it is potential vs Li/Li+ and see that Oxides ...
2
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1answer
402 views

What does the osmotic pressure do in an electrolytic solution?

I have learnt that in an electrochemical cell, the osmotic pressure in the solution hinders the flow of ions from the electrode to the solution, rather some ions may accumulate on the electrode ...
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0answers
21 views

Electrolysis of urine [duplicate]

Quetions. What is the most easiest method of electrolyzing urea (urine)? What should be the electrode and anode in order to allow formation of chlorine gas but eliminate formation of copper (II) ...
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0answers
46 views

Why is $E°_{cell}$ not $\Delta E°_{cell}$?

$E°_{cell}$ is the EMF of the cell for a reaction with respect to standard hydrogen electrode(SHE). So why don't we represent $E°_{cell}$ or $E_{cell}$ by $\Delta$ symbol, in the same manner in which ...
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0answers
39 views

Electric fields in a galvanic cell

I have read hat there is two types of electric fields exist in galvanic cell.I understand E because of charges accumulated on electrodes but what about other E -field? What does cause this field and ...
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1answer
612 views

Electrochemical Cell

Now in an electrochemical cell , we make use of the fact that whenever there is a potential drop , electrons will flow from lower to higher potential as for a potential drop , there must be an ...
3
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2answers
381 views

What dictates cathode vs anode nomenclature use?

what was the justification for the use the cathode and anode terminology in IEF? There is no redox taking place in IEF, just proteins interacting with an electric field
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6answers
468k views

Positive or Negative Anode/Cathode in Electrolytic/Galvanic Cell

In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive. This seems reasonable as the anode is the source of electrons and cathode is where the electrons ...
3
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1answer
136 views

Is a discharged battery in a state of chemical equilibrium?

A reaction that has reached chemical equilibrium no longer shows changes in reactant and product concentrations, but forward and reverse reactions are still going on. I'm confused whether a completely ...
4
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0answers
50 views

Is pH in a charged hydrogel and its supernatant solution constant?

Let us assume we deal with ideal systems without interactions. The gel phase and the supernatant solution phase are in thermodynamic equilibrium. The supernatant solution shall consist of different ...
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1answer
27 views

In a galvanic cell,do charges accumulate on electrodes 1st (then redox occur) which produce E in the wire when we connect between electrodes? [closed]

We study that when we connect a wire between the terminals of a battery ,an electric field in established between terminals due to potential difference .Is the potential difference result of ...
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0answers
22 views

How does different pH affect copper electroplating [closed]

I'm currently investigating the effect on the concentration of hydrogen ions in the copper sulfate solution on the amount of copper deposited on the cathode within a certain amount of time. I've ...
4
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3answers
16k views

Calculate the standard oxidation potential from given potentials

The standard electrode potentials for the following redox couples are given as: >$E_0(\ce{Fe^{2+}/Fe}) = x~\mathrm{V}$ and $ E_0(\ce{Fe^{3+}/Fe^{2+}}) = y~\mathrm{V}$ What will be potential $E_0(\ce{...
3
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1answer
117 views

Is it true that “Voigt Circuit” would be able to be fitted to various electrochemical impedance spectra?

"Voigt Circuit" which is a series combination of Voigt elements (i.e. parallel RC's), is commonly used for Kramers-Kronig relations checking; and as I imagine it is generally believed to be able to be ...
2
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1answer
41 views

General Oxidant - Reductant Battery

In general, is it true that if I connect an aqueous oxidant to an aqueous reductant via a wire then a current flows along the wire? In particular, does current flow in the following scenario? Imagine ...
2
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2answers
256 views

Can I use a digital multimeter as substitute for a zero resistance ammeter?

I am testing the galvanic corrosion between two metals, following ASTM G71. In this method, a zero resistance ammeter was the material presented to determine the galvanic current measurements. ...
2
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2answers
138 views

Amperage for the electrolysis of water?

I am electrolysing water using several different potential catalysts for my eight grade science fair project. The electrolysis will be running at 2 to 2.5 volts over nickel electrodes, as I do not ...
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0answers
25 views

How does one electroplate Lithium onto a conductive metal? [closed]

In this case the anode for electroplating would be the Lithium and the cathode would be any conductive metal. Unfortunately Lithium reacts violently with water, which is the basis of most electrolyte ...
7
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2answers
939 views

Nernst equation for a fuel cell when gases are stored separately

I have run some tests with a PEM fuel cell and the voltage we have found was $1.44\ \mathrm{V}$. Given that the standard potential for a fuel cell is $1.229\ \mathrm{V}$ what is causing the difference ...
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1answer
38 views

Electrolytic refining of precious metals — why the anode rather than the cathode? [closed]

In electrolytic refining, metals like platinum and gold are deposited as anode mud. Why aren't they deposited on the cathode since they have higher reduction potential?
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2answers
553 views

What is entropy change in electrochemistry?

I keep seeing entropy change (or reversible effects) and irreversible effects (Joule heating) when reading about charging and discharging of Li-ion batteries. I understand the Joule heating part (the ...
2
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3answers
5k views

Hydrogen fuel cell - why do the H+ ions move through the electrolyte

Consider the following hydrogen fuel cell http://butane.chem.uiuc.edu/pshapley/Enlist/Labs/FuelCellLab/FuelCell.html At the anode, hydrogen is oxidised (losing electrons). My first question is this: ...