Questions tagged [electrolysis]
For questions about the chemical concepts of electrolysis.
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Electrolysis of water and Gibbs Energy
I'm writing a chemical equilibrium program which minimizes the Gibbs energy. The program accepts as input the total amounts of the elements comprising the system, and a list of possible molecular ...
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27 views
What is the yellow compound formed in electrolysis of brine?
Last week, I tried to conduct electrolysis of brine in my house using copper electrodes and 6V battery. After sometime, the entire solution turned orange/yellow. The yellow substance formed a kind of ...
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1answer
21 views
Is the thermodynamic stability against reduction/oxidation of an electrolyte dependent on the electrode material?
Consider an electrochemical cell with an inert Pt working electrode (WE) and some electrolyte that irreversibly decomposes upon oxidation. A minimum potential $E_{min}$ (vs. some reference) needs to ...
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1answer
31 views
Electrolysis of Baking Soda separated by semi permeable membrane
I have dissolved baking soda in battery water (de-ionized), in a glass beaker and used a food handling glove (vinyl) as a semi-permeable membrane to separate a graphite electrode from a copper ...
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45 views
Why does the electrical conductivity increase as the temperature decreases?
I am measuring the dependence of electrical conductivity of ( NaCl and $\ce{CH3COONa}$ solutions with concentration 9g/L) with temperature using conductivity meter.
Theoretically the conductivity ...
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19 views
Black substances covering Aluminum Electrode
I have use two aluminum pieces as electrodes to electrolys salt (NaCl) water. After the experiment, I found that wherever electricity flows, the electrode will be covered in some blackish substances. ...
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Competing half reactions in electrolysis of aqueous solution of sodium hydroxide
If you run a direct current using pure nickel electrodes through a solution of NaOH in distilled water, you will separate the water into hydrogen and oxygen.
Are there any other reactions that could ...
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3answers
32 views
Electrolysis of aluminum in a solution of magnesium sulfate
So I recently started looking into electrolysis to produce chemicals and I have only produced a few chemicals from it like copper hydroxide and copper sulfate. However I can’t seem to figure out what ...
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27 views
Why does electrolysis of concentrated sodium chloride solution pulsating and what is the relation between electrode surface area and pulsation?
While electrolysis of concentrated NaCl solution (Active electrodes like Iron aluminium etc) pulsation appear from cathode if electrode fully immersed in electrolyte and it disappear when any of the ...
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1answer
35 views
Why should we be interested in catalyst for electrolysis?
I've been reading papers on Phosphided metals (CoP, NiP, FeP) as a catalyst for electrolysis. They increase the current density of the cell for a voltage. If it still requires 39.4 kilowatt-hours ...
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1answer
32 views
Copper wire smoking underwater [closed]
I am doing an electrolysis experiment with two copper wires inside of test tubes that are both submerged underwater, with 20 V per wire. Test tube A is creating oxygen gas at a high rate, but test ...
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1answer
28 views
Hydrogen reactor, with electrolysis [closed]
I was thinking about hydrogen reactors. How they turn hydrogen and oxygen into water.
I just learned about electrolysis, so I was curious how efficient it would be, to fill a cars tank up with ...
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1answer
50 views
Eletrolytic rust removal [closed]
I've seen quite a few youtube videos about electrolysis for rust removal. The process seems to be effective. My question is: how does it work?
I get that the water is ionised so we have O- and OH+ ...
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1answer
48 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
43 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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38 views
electrolysis in aqueous solution. Why is hydroxide discharged at the anode when no halide ions are present [closed]
Why are hydroxide Ions discharged when halide ions aren’t present in aqueous solution during electrolysis
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1answer
258 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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18 views
Is coating titanium with PbO2 better alternative to the graphite substrate one?
I want a good anode for my chlorate cell. I tried coating graphite with PbO2 but without success. So I was wondering about using titanium as substrate. Is it better then graphite, also is it easier to ...
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26 views
What is the cause of yellow discharge in beaker during the electrolysis of copper electrodes using copper sulfate electrolyte?
I have conducted an electrolysis experiment using a copper anode and cathode, and copper sulfate solution in a beaker connected to a power source using alligator clips. I varied the voltage and ...
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1answer
148 views
Why is Q/nF equivalent to the amount of substance in electrolysis?
I am told that
$$Q = nF$$
where $Q$ is the quantity of current, $n$ is the amount of electrons and $F$ is Faraday's constant. Since Faraday's constant is the charge carried by 1 mol of electrons, ...
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1answer
107 views
Electrolysis of molten sodium chloride [closed]
Can somebody explain me the electrolysis of molten $\ce{NaCl}$ via electrode potential?
Reduction potential of $\ce{Cl-}$ is -1.36 V, while sodium metal is -2.76 V, but still sodium is reduced and ...
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45 views
Reducing agent in electrolysis [closed]
I would like to make colloidal silver to kill mold. I think $\pu{100ppm}$ (weight) would be nice. I read a paper on it and in it they used citric acid + distilled water as fluid, two silver plates as ...
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72 views
Electrolytic cell - Potentials
I'm an electronic engineer student and I'm trying to understand the basics of electrolytic cells and practical values' meaning. Based on my figure and electrode potencial values (Vce, Vre and Vwe), ...
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1answer
208 views
Can sulfuric acid itself be electrolysed?
We all could know by now that water can be electrolysed by adding some sulfuric acid.:)
But is it possible that the sulfuric acid itself becomes electrolysed when the concentration of the acid in the ...
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1answer
32 views
How to estimate the maximum chlorine hazard from 1 g of Palladium(II) chloride? [closed]
I plan to work with an electrolyte that contains 1 g of Palladium(II) chloride. I am trying to estimate how much of a hazard this system could possibly pose (and provide ventilation, chlorine ...
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1answer
353 views
Confused with 'discharge potential',preferential discharge theory [closed]
My book says that the ions which have least value of discharge potential are deposited first in the concerned electrode because the 'require' the least energy to do so.I am confused by 'require' , do ...
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26 views
A more efficient method for electrolysis?
If you made the anode and cathode both out of a single piece of zeolite that has been coated inside with graphite (or graphene) wouldn’t that provide a conductive path and greater surface area thus ...
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1answer
208 views
Is the cathode and anode on the cell notation of an Electrolytic cell on the same side as if how you will write it for a Galvanic cell?
I was reading an online material then I came upon a cell notation for an electrolytic cell (I determined that it was an electrolytic cell because of the absence of a salt bridge). Usually, I will ...
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2answers
89 views
In a half cell reaction, Is the potential halfed?
If you have an electrolyte of $\ce{Zn^2+}$ and $\ce{SO4^2-}$ (Neutral) Then you dip in it a Zinc electrode.
Zinc potential is $\pu{-0.74 V}$ (relative to SHE). So that means there is a $\pu{-0.74V}$ ...
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71 views
Is it possible to synthesize permanganate electrochemically?
I have been researching the production of peroxy acids and other strong oxidizers. I was wondering if it's possible to produce permanganic acid if I were to cast an anode containing Manganese Dioxide ...
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1answer
86 views
What is the benefit of high surface area electrodes?
Some electrolytic apparatus is equipped with high surface area electrodes. The number of reduced/oxidized atoms is proportional to the total charge flowing through the cell. Does increasing surface ...
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1answer
37 views
Non-zero current flow through an electrolytic cell, when an electric potential lesser than that needed for electrolysis is applied?
For instance, the potential needed for water splitting is $\pu{1.23V}$. However, there is current flow even at lower potentials (say $\pu{0.5V}$). Clearly, there is no redox reaction happening in the ...
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30 views
Electrolysis of a calcium salt in polar aprotic solvent
If i found a calcium salt that is soluble in acetone or ethyl acetate, which are polar aprotic solvents, and attempted electrolysis, what would happen? Since polar aprotic solvents are used in metal-...
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1answer
48 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
102 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
352 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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1answer
50 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
37 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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44 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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38 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
483 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
83 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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30 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
73 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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1answer
103 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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25 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
110 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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126 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
43 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
115 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 ...
