Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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34 views

Is the rate of electrolysis the same throughout as long as voltage is same

In an electrolytic cell, where the electrolysis of dilute sulfuric acid is taking place, would the rate of electrolysis be constant always, even at the beginning? By rate of electrolysis, I mean the ...
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2answers
60 views

Will mixing hydrogen and oxygen without a spark result in combustion? [duplicate]

I plan to do the electrolysis of dilute sulphuric acid. This will produce hydrogen gas and oxygen gas at the anodes. I do not plan to collect these gases, but to simply let it form and release into ...
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1answer
27 views

How to calculate current density in an Electrolysis Process?

I have an anode & cathode, both of $100 \times \pu{100\\mm}$ size. The process requires $\pu{450\\A/m2}$ current density. How do I reverse calculate this? Do I use the total surface area of both ...
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0answers
24 views

Will placing a pH meter probe in an electrolyte destroy it?

Will placing a pH meter electrode in the electrolyte of sulfuric acid while electrolysis is on-going destroy the meter?
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1answer
41 views

Sodium metal burning off when conducting electrolysis and I don't know why

I melted down some table salt and used high voltage welder power source to try and separate the sodium and chlorine it was partially successful because I could smell and see chlorine gas but during ...
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1answer
29 views

How hot will a carbon electrode get in an electrolysis setup?

For the electrolysis of sulfuric acid, I plan to use carbon graphite electrodes at voltages up to 6 V. I would like to know if my carbon electrodes would get considerably hot or warm (45 °C or higher)....
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37 views

Would this experiment be electrolysis experiment be viable?

I plan to do a 'research project' or an experiment involving the electrolysis of dilute sulfuric acid. The idea or 'question' is this: Would there be a variation in the $\mathrm{pH}$ of the ...
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0answers
21 views

Which transparent plastic to use for electrolysis of dilute sulphuric acid

I plan to do an experiment which involves the electrolysis of dilute sulfuric acid (1 M or 1 mol/L). I would like to carry it out in a long transparent plastic container (easier to handle and clean). ...
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1answer
46 views

Water colour changes to yellow after electrolysis [closed]

A salesman recently conducted electrolysis experiment on 4 samples of water-- river water,tap water, his own water and water from Aquaguard RO filter. The colour change after electrolysis on different ...
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1answer
29 views

How to reverse copper electroplating?

We did a lab where we built a simple electrolytic cell. In a beaker was a solution of $\ce{CuSO4}.$ A copper strip (anode) and a copper wire (cathode) was place in it. A wire connected the copper ...
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19 views

Pool Water Electrolysis for Rust Removal

I had an old tool I was trying to remove rust from using electrolysis. I used a solar panel and chlorinated pool water. I have had a difficult time online finding what the products of the reaction ...
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1answer
36 views

Why does H2O electrolysis produce O2 on the anode instead of H2O2

If the oxidation of $\ce{H2O}$ produces $\ce{OH-}$ ions and the anode separates electrons from them leaving neutral $\ce{OH}$ molecules, why don't they bind to each other covalently?
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80 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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20 views

What Ion gets reduced in this aqueous electrolysis?

In an electrolysis of tin(II) iodide ($\ce{SnI2}$) with led cathode and nickel anode, why is it that the tin ion gets reduced and not the nickel ion?
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1answer
50 views

Determining the charge on an ion through mole calculation in electrolyis

During electrolysis $\pu{0.02 mol}$ of metal $\ce{X}$ is deposited on cathode when $\pu{0.12 mol}$ of electrons are passed through molten chloride of $\ce{X}.$ What is the formula of the chloride? I ...
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41 views

Degradation of carbon anode in electrolysis of copper sulfate

I'm electrolysing a copper sulfate solution with a 12 volt DC supply using two carbon electrodes. The anode is reducing in mass and becoming thinner. Is there any way I can overcome this problem?
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1answer
28 views

Does the current of an electrolytic cell increase if the surface area of the Cathode is increased

I am currently in high school and will be conducting an experiment looking at the effect of surface area on electroplating. I will be changing the surface area of the Cathode during my experiment but ...
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1answer
62 views

Why does magnesium deposit during electrolysis of a molten mixture of MgI2 and AlBr3?

During the electrolysis of mixed salts, I read, and was taught, that the cation with a higher ionization energy would deposit at the cathode. I was also told that you cannot use the standard electrode ...
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0answers
29 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 ...
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1answer
300 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
90 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
39 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
34 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
37 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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31 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
65 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
60 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
148 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
27 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
32 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
153 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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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
159 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
79 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
238 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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77 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
118 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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316 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
88 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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0answers
52 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
136 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
110 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
161 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
523 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
57 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
617 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
27 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
72 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
234 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
9 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 ...