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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1answer
403 views

Electolysis of H2O to produce O2(g), in a small, portable unit

Full disclosure, I'm just a high school chem student, but I've got this question and I couldn't find the answer anywhere online. I was reading an article about some futuristic "artificial gill", which ...
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89 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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Why is chloride oxidised instead of water in copper chloride electrolysis?

For the Electrolysis of Copper Chloride: Cathode: $\ce{Cu^{2+} + 2e- <=> Cu}$ Anode: $\ce{2Cl <=> Cl2 + 2e- }$ I am confused about the reaction taking place at the anode. Wouldn't $\ce{...
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1answer
123 views

Charge, Size, and Movement in Aqeuous Ions as Electrolytes

Would a pair of aqueous $+2$ and $-2$ ions necessarily conduct electricity better than the same concentration of $+1$ and $-1$ ions? Furthermore, would more massive ions not conduct as well as less ...
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158 views

Will oxidation/reduction of copper still occur in an electrochemical cell if it is not in an aqueous environment?

Notation of the reduction and oxidation of copper typically includes the aqueous state. Illustrated below: $$\ce{Cu(s) -> Cu^2+(aq) + 2e-}$$ This event usually occurs at 0.34 V. What if the copper ...
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1answer
435 views

Is a strontium-fluorine battery the highest voltage battery using pure elements?

Strontium has a very low standard electrode potential and fluorine has a very high one. $$ E_{\ce{F2 + 2e^- -> 2F^-}} = 2.87\mathrm{V} $$ $$ E_{\ce{Sr -> Sr^+ + e^-}} = -4.10\mathrm{V} $$ In ...
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1answer
6k views

What will be the reaction between tin (II) chloride and copper (II) chloride?

I just tried conducting an experiment during lunch today. Now, I calculated this reaction 4 days ago dealing with electrochemistry, $$\ce{SnCl2 + CuCl2 -> Cu(s) + SnCl4}$$ Theoretically, I got ...
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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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838 views

Cyclic Voltammogram - How to determine Overpotential

http://youtu.be/1f92vGOridg Clicking on the link above will take you to a video with a diagram of a voltammogram. Through my own experiments I have managed to obtain a similar diagram. However, I am ...
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93 views

Laws of electrolysis and quantisation of charge relation

The quantisation of charge was first suggested by the experimental laws of electrolysis discovered by Faraday I think about it a lot but could not find any relation, as the number of electrons ...
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Electrolysis of Water: Overvoltage?

I've heard from a few sources that over-voltage in a electrolysis cell for water will cause a greater heat buildup with no yield. Is this true, and if it is, why is it true? From my electronics ...
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1answer
454 views

Partial Coverage During Zinc Plating Bath

I am experiencing partial coverage of a part during a DIY home zinc plating operation and was hoping someone here may be able to identify the cause of this. I am using a solution of household vinegar ...
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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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1answer
867 views

How to calculate the electrochemical potential of Iron(II/III) and saturated calomel electrode?

Set up an electrochemical cell where the cathode is the system in question B, $\ce{Fe^2+ -> Fe^3+}\ E = 0.68~\textrm{V}$, whereas the anode is a saturated calomel electrode ($0.244~\mathrm{V}$ ...
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576 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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4k views

What does electrolysis of Cu(NO3)2 produce?

I have read that $\ce{Cu}$ is deposited at the cathode when copper (II) nitrate is electrolyzed. However, when I looked at reduction potentials, the reduction of nitrate to $\ce{NO}$ and $\ce{H2O}$ $(...
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163 views

Adding reduction potentials?

Will it be wrong to add reduction potentials of two intermediate reactions to get reduction potential of net reaction(just like as we do in adding enthalpies and applying Hess's law)? What is the ...
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1answer
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How long will it take for a measurable change in mass (corrosion) in an iron copper corrosion cell to happen?

I am planning to do an experiment, in which I will test the affect of salt concentration on corrosion rate. Would there be a relationship? How long would it take for rust to form, that could be ...
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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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1answer
114 views

Where did I go wrong in the following calculation for molar conductivity?

Resistance of a conductivity cell filled with $0.1~\rm{mol\, L^{–1}}\ce{KCl}$ solution is $100~\Omega\;.$ If the resistance of the same cell when filled with $0.02~\rm{mol\, L^{–1}}\ce{KCl}$ solution ...
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1answer
57 views

Wattage to produce 6L of air from Water in less than a second?

So I understand the question is probably vague to a scientist, but this is all the specifics I could mustard up with my non-scientific background. So I understand the basics of the process and have ...
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382 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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748 views

Why did my lemon and penny battery fail?

I followed instructions in Popular Mechanics publication for making a battery using lemons and pennies but it didn't work. I have a few ideas on why it might not have worked and would like to know ...
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Gibbs Free Enegy using electrode potential under standard conditions

I have a question regarding the number of moles when using the equation $$\Delta G=-nF\Delta E$$ I understand that n is the number of moles transferred in the overall redox reaction, however, it ...
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What are the chemical formulae for galvanic corrosion of iron (rusting)?

The conditions for corrosion, I am searching equations are as follows: The other metal is copper The temperature is $25~\mathrm{^\circ C}$ The electrolyte is $\ce{NaCl}$ pH 7 A limited amount of ...
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Alternatives to Ring Stands

I'm trying to find an alternative to simple ring stands to hold a simple electrochemical cell. The issue is that it is difficult to adjust the height to the right position to within even a couple ...
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1answer
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Determining electrode potential

Can the anode always be considered as having a lower standard electrode potential than the cathode? When I was studying galvanic cells, I found that for a number of reactions, it always appeared that ...
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1answer
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Is it possible to have an airborn fluorescent particle that reacts to lightning?

I want to measure the expansion of the atmosphere when it is heated and impacted by lightning, to have an idea of the propagation of sound waves made by lightning. To do this, the ideal would be to ...
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1answer
4k views

Current in a galvanic cell

I was looking through chemistry textbooks to find out how to determine how much current a galvanic cell should generate and what affects that current value. However, I did not find anything: textbooks ...
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1answer
83 views

Placement of Electrodes for Electrochemistry?

I'm kind of curious as to the relationship between resistance and the yield of electrochemical methods. If I have my electrodes rather close together in a conductive solution the resistance will be ...
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83 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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1answer
247 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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224 views

Galvanic cell chemistry

I made a galvanic cell with the anode electrode being aluminum and the electrolyte being aluminum sulfate. The salt bride was magnesium chloride. I am a little confused on what my oxidation equation ...
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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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1answer
559 views

Prevention of rusting

I'm currently learning about corrosion prevention, and have a question regarding galvanising. Say that you have an iron nail. You galvanise it (coat it in zinc), so that is doesn't rust by preventing ...
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1answer
3k views

Choosing an electrolyte for a galvanic cell

I was wondering what processes are used to select an electrolyte for a galvanic cell. I know a zinc copper battery usually has zinc and copper sulfate electrolytes. How do these electrolytes interact ...
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2answers
440 views

Is it possible to have electric field in water without having electrolysis?

Is it possible to have electric field in water (using electrodes with voltage difference) without having electrolysis in the water (or any other reaction)?
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403 views

Electrolysis of brine without a membrane

In the electrolysis of brine sodium hydroxide is normally formed if there is a membrane preventing the transfer of the chlorine gas. So if the membrane is removed, will the chlorine gas react with ...
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1answer
656 views

Where does the charge on an electrode, responsible for the formation of a double layer once submerged in an electrolyte, come from?

I've started exploring electrical double layers and electrode-tissue interfaces whilst dealing with deep brain stimulation and stimulus artefact. I've heard many times that what causes the double ...
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666 views

How can I balance the following equation atomically and electrically?

$$\ce{C2O4^2- + MnO2 -> Mn^2+ + CO2}$$ I think that the half reactions are $$\ce{C2O4^2- -> CO2}$$ $$\ce{MnO2 -> Mn^2+}$$ I am supposed to balance these by adding water, $\ce{H+}$ atoms ...
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477 views

If you run an electrolytic cell long enough, does the conductivity decrease?

I've never seen this discussed so I wanted to ask here. Consider the electrolysis of water with inert electrodes and electrolytes that won't be oxidized or reduced, such as sodium sulfate. Since the ...
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1answer
381 views

aluminum hydroxide as an electrolyte

A friend and I recently produced some aluminum hydroxide, $\ce{Al(OH)3}$ for a project, and we wondered how it functions as an electrolyte. We know it has a low conductivity and solubility, but we ...
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1answer
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Where do I go to get details on setting up different instruments?

Say I want to set up a system to preform cyclic voltammetry. How do I know what instruments to get/ electrochemical cells/ etc? Is there a resource for other setups as well, like EIS?
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electrolysis of aqueous zinc nitrate

Can anyone explain why in the electrolysis of aqueous solutions such as zinc nitrate, the oxidation half equation shows hydroxide ions forming oxygen and water - can this half equation be balanced ...
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393 views

How will the transference number of H+ ion in a dilute solution vary as temperature increases?

I know that transference number depends on Ionic mobility, which depends on temperature. But is there any equation which describes the relation of Transference number and temperature, any ions like H+....
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259 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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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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Why are potential electrolytes poor conductors in the pure liquid state?

In my textbook, "In the pure liquid state, a true electrolyte is a good conductor of electricity. In contrast, a potential electrolyte is a poor conductor in the pure liquid state." definitions "A ...
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1answer
253 views

Where does the pH come from in the equation of Standard Hydrogen Electrode?

$$\mathrm{E=-{2.303RT \over F}pH - {RT \over 2F}\ln {p_{H_2}/p^0}}$$ This is a equation on Wikipedia page of Standard Hydrogen Electrode, but I have no idea where the $pH$ come from. Since $\mathrm{a_{...
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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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