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Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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3
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0answers
48 views

Is there a reason to use bases in electrolysis and acids (eg vinegar) for electroplating?

To me, electrolysis for rust removal and electroplating seem to be the same process, with different metals and goals. However, in seeing electrolysis and electroplating videos, it seems that ...
7
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1answer
585 views

Why does electrolysis of aqueous concentrated sodium bromide produce bromine at the anode?

It is often stated that electrolysis of any aqueous concentrated halogen compound will produce the halogen at the anode, despite it having a more postitive standard electrode potential than the ...
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2answers
109 views

Why is reduction potential of water ( 2H₂O + 2e⁻ → H₂ + 2OH⁻ ) is -0.83 insted of 0, as in the case of (2H⁺ → H₂)?

I came across this value of reduction potential of water while solving a question. Also, I noticed that, for example $$\ce{Ag+ → Ag}$$ has a fixed standard potential, and the same is used when we do ...
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1answer
46 views

Electrolysis - What is the basis for the discharge rules?

At the cathode, the one that is discharged is the less reactive one (compared to hydrogen) so why at the anode is the one that’s discharged more reactive (less stable) ?
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1answer
65 views

Would electrolysis work with a conductive (but waterproof) divider between anode and cathode?

Note I am not trying to "double fuel efficiency" in a car or something scamey like that. My purpose is to fill balloons with hydrogen and possibly power an HHO torch (also make it safer because pure ...
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1answer
49 views

Reference Books on Electrolysis and Chemical Titration process [closed]

I'm in a General Chemistry course in college. We have laboratory, and then we are supposed to make a report on what we did, etc. I'm not entirely sure what the last laboratory was about, but it was ...
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52 views

Can a Hydrogen Radical form in a chemical reaction?

Original question: During kolbe electrolysis of Formic acid, H2 is released at which electrode? What I thought: H2 will form at cathode due to reduction of water. But will the Formic acid decompose ...
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1answer
112 views

Using electrolysis of water as a proton generator [closed]

I'm working on a project right now, where the challenge is to try to use electrolysis as a way of controlling the $\ce{pH}$ of water. I've set up an experiment where I have two separate chambers or ...
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0answers
226 views

Does increasing the concentration of the anode electrolyte in a galvanic cell increase or decrease the voltage produced

Im in kind of a pickle here. I am using nernst equations to calculate the theoretical voltage produced for different concentrations of $\ce{Al(NO3)3}$. Reaction: $$\ce{2Al(s) + 3Pb^{2+}(aq)⟶2Al^{3+}(...
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1answer
210 views

Pressure-dependence of electrolysis voltage

I'm trying to better understand electro-chemistry, so please explain why this second-kind perpetual motion device won't work. I guess it's safe to assume it won't work one way or another. There is a ...
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1answer
28 views

Is it stupid to put used acid into a pool after cleaning the chlorinator? [closed]

I have a salt pool, and when the chlorinator salts up with calcium, I clean it with a diluted acidic solution. What happens to the acidic solution after the reaction happens? I.e., does the pH change?...
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1answer
36 views

Electrolysis rust removal - side products - identify lead [closed]

my kids want to restore an old hand tool made of mostly iron. I've choosen electrolysis as method for rust removal. We used Natron to enhance the conductivity of the water. The process worked so far ...
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1answer
277 views

What happens if water is treated to AC power supply of 12 kV and 14 kHz? [closed]

Generally water splits to oxygen and hydrogen at $\pu{1.23 V}$. What happens if we treat water at several $\pu{kV}$ with frequency range of $\pu{10 kHz}$ to $\pu{15 kHz}$ AC supply.
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38 views

Instead of using an Ag/AgCl electrode, can I simply use another beaker and connect it to my solution via a salt bridge? [closed]

I'm trying to perform a potentiometric titration as part of my high school laboratory work, by reducing iron(III) to iron(II), and measuring the voltage change as I add cobalt(II) (to reduce it). The ...
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1answer
529 views

How does a change in the surface area of the electrodes affect the voltage produced by a galvanic cell?

I did a lab where I increased the surface area of the electrodes in a galvanic cell, that resulted in an increase in voltage. However, I have been reading and that is not supposed to happen. I am a ...
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1answer
95 views

Electrosynthesis of HCl? [closed]

I was attempting to synthesize hydrochloric acid and it seems to have formed another form of chlorinated acid. The smell is more of chlorine and is extremely powerful. I got some on my jeans and it ...
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1answer
417 views

Is electrolysis of molten silver nitrate possible? [duplicate]

Since the salt is molten, the only ions are $\ce{Ag+}$ and $\ce{NO3-}$, and both of them can only do a reduction reaction. Who goes to the anode? Also, there is no acid in the solution — only the salt ...
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0answers
281 views

Is electrolysis with AC current possible? [duplicate]

Optimizing everything else, would efficient electrolysis be possible with AC current? Most sources suggest to use DC, but can the water still be split/disassociated with AC?
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1answer
217 views

Degradation of anode in electrolysis

In my electrolysis experiment, I used a 9 volt battery, 1:100 mL baking soda:distilled water, and stainless steel electrodes. I noticed that the anode degraded faster than the cathode. Out of ...
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0answers
646 views

Electrolysis in water with baking soda

Many demonstrations of electrolysis show the use of baking soda and a 9 volt battery for electrolysis of water. As a science experiment, I tested different voltages by adding more batteries. In my ...
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1answer
103 views

Pale blue species forming during electrolysis of NaHCO3

I have a solution of 3500 ml $\ce{H2O}$ + 454 g $\ce{NaHCO3}$ in electrolysis at a potential of 12.5V using a lead anode and copper cathode. The surface areas aren't measured but they are enormous. I ...
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82 views

Electrolytic cell to remove soft solder from silver?

Hi my chemistry is pretty dire but have vague idea that an electrochemical cell could be used to remove soft solder (lead/tin probably) from a piece of sterling silver in need of a repair. The ...
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1answer
381 views

Does electrolysis of aqueous tin(II) chloride produce Cl₂, SnCl₄ or both?

When applying a current to an aqueous solution of tin(II) chloride, tin crystals grow from the cathode. However, I'm not sure about the anode. It seems like there are two possible reactions: $$\ce{2 ...
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1answer
210 views

In an Electrotlytic cell using MgSO4 electrolyte, Cu(OH)2 and Mg(OH)2 are visible products, Where Does SO4 go?

I have an electrolytic cell with $\ce{MgSO4}$in an aqueous solution at full saturation, running at a potential of $3.6v$ with a copper anode because I need some $\ce{Cu(OH)2}$. Production of $\ce{Cu(...
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1answer
296 views

Electrolysis of molten CaOH and CaCl

So recently I have been trying to get elemental Calcium but I only found a cheap solution in electrolysis of molten $\ce{CaCl2}$ (thats because calcium chloride is very cheap) and I am not sure If it ...
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1answer
882 views

where is sulphate going here? electrolysis of magnesium sulphate

I am electrolyzing a water + magnesium sulphate solution using copper for both electrodes. I am getting a light-blue precipitate forming which I believe to be a mixture of copper hydroxide and ...
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1answer
112 views

Bonding metal pieces using electroplating - what's the process called?

So I think the title all most says it all - given say two pieces of copper can we make solid 'weld' using electroplating chemistry? If so whats the accepted terminology for this process so I can do ...
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1answer
1k views

Why can't sulphate ion be discharged in the anode of electrolysis?

Given that there is an aqueous solution of sulfuric acid ($\ce{H2SO4}$), $\ce{2H+}$ is reduced in the cathode and $\ce{OH-}$ is reduced in the anode. Why is $\ce{OH-}$ preferentially discharged over $\...
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1answer
63 views

Number of electron for complete Discharge [closed]

What is the answer for question 17 and what is mean by "number of electrons for complete discharge?" Which of the following needs the largest number of electrons for complete discharge during an ...
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1answer
120 views

Electrolysis of water using 240V AC [closed]

I remember back in my high school, when we started electrolysis, I became quite interested in it. I decided to do a home experiment on electrolysis of water. I grabbed my graphite pencils, a glass of ...
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0answers
344 views

Why is Zinc reduced instead of Hydrogen, in the electrolysis of aqueous Zinc Sulfate, using Carbon electrodes?

In the electrolysis of aqueous zinc sulfate using carbon electrodes, why are zinc ions reduced at the cathode, instead of hydrogen ions? How does this relate to over potential? It would mean a lot ...
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0answers
10 views

Reactants in high temperature chemical vapour deposition

I'm setting up a high-temperature electrolysis rig for the purpose of chemical vapour distribution. The molten carbonate (750 degrees Celsius) will be lithium carbonate. The cathode will be ...
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0answers
280 views

Electroplating with iron and copper acetate

Im trying to do cheep electroplating using iron and copper acetate as in introduction to electroplating and working with acids. Each solution was prepared using heated vinegar and hydrogen peroxide. I ...
6
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1answer
140 views

If liquid hydrogen fluoride autoionises, how can it be an insulator?

According to Wikipedia, one of the last major hurdles in the isolation of elemental fluorine was the need to mix hydrogen fluoride with another substance in order for its electrolysis to be possible (...
2
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0answers
105 views

The effect of the voltage at the Downs cell

I referred the Wikipedia and Advance Chemistry by Philip Matthews, for having a much comprehension on the down cell, but there was a opposition while reading the both references. Wikipedia states ...
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2answers
376 views

How to make copper salicylate with electrolysis?

I am trying the following and it looks like it may be working, but I am not certain what the end product would be. Basic electrolysis setup: two cups distilled water, with 3 g of copper wire on anode,...
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0answers
49 views

What reactions will occur at the anodes and electodes of two iron electrolytic cells?

What reactions will occur at the anodes and electrodes of two iron electrolytic cells: both with iron metal electrodes, one with an iron(II) sulphate electrolyte, the other with an iron(III) sulphate ...
3
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2answers
604 views

What happens to iron electrodes (attached to a battery) in copper(II) sulphate solution?

After a few hours, the following observations were made: The solution turns green. My guess: $\ce{FeSO4}$ is formed. There are reddish-brown and black powder deposits on both the electrodes. The ...
3
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1answer
353 views

Electroplating diamond grit

I want to do electroplating with diamond grit and make profiling, grinding and cutting disks. (see the attached photos) I want to know the process to make the machine or the company whom is selling ...
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0answers
137 views

Which carbon electrode gets plated with Zinc on a beaker with zinc sulphate solution?

In a beaker containing zinc sulpate and two carbon electrodes connected to a battery, which electrode gets electro plated with Zinc? Why?
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1answer
793 views

Difference between titanium and titanium dioxide electrode

I need an inert anode to perform some electrolysis. I've tried graphite, which works to some extent, however I want to upgrade to titanium, which is pretty reasonably priced, and will perform better ...
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0answers
253 views

What effect does an increase in concentration of copper sulphate solution have on the rate at which copper is deposited at the cathode?

I have been studying electrolysis in school and was wondering whether a higher amount of copper sulfate solution would produce a greater mass of copper in an electrolytic cell with two copper ...
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1answer
138 views

Can I use pure zirconium as an anode in electrolysis?

I read that zirconium is not very reactive even when supplied with a current in an electrolyte. If I had a sizable piece of it, can I use it to perform electrolysis for rust removal of items? Would it ...
2
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1answer
848 views

In the simplest terms, what is exchange current density?

what is exchange current density, and ideally how does it relate to overpotential I know it's related to the amount of dynamics in a reaction, so it can tell us how simple or complex a reaction ...
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0answers
286 views

What products come from the electrolysis of sodium bicarbonate? [closed]

I did an experiment finding the electrolysis of various solutions. One of them was sodium bicarbonate and tap water. I want to be able to scientifically explain my results, using chemical equations ...
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3answers
86 views

Is it possible to prevent sacrificial anode contaminate the soil?

I have a mild steel pipe (black pipe, NOT zinc plated) water well. My question: is it possible to somehow put a sacrificial anode in an electrolyte contained in a bucket instead of burying it in the ...
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0answers
37 views

Is there a polar liquid with a high electrolysis potential?

I'm trying to use $\ce{Na2SO4}$ for intercalation of sulfate ions in van der Waals stacked materials (as anodes). With water as the solvent, there is some indication of hydroxyl radical forming due to ...
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0answers
2k views

How does the cathode of an electrolytic cell drive the anode reaction?

Consider this electrolytic cell: In this cell, electrons from the anode of the battery travel to the cathode of the electrolytic cell, where hydrogen ions are reduced into hydrogen gas. This drives ...
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1answer
548 views

Anodisation of aluminium in sulfuric acid - Electrolysis reactions [closed]

As an experiment for electrolysis and to show how a metal can be protected of corrosion, I am trying to anodize an aluminium plate, using sulfuric acid as electrolyte. I know the aluminium plate is ...
6
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1answer
158 views

Electrolysis puzzle

I created an electrolysis setup to study how different electrolytes, their concentrations, and the electric current affect the "speed" of the electrolysis process. With that in mind, I built a simple ...