Questions tagged [electrolysis]
For questions about the chemical concepts of electrolysis.
355
questions
0
votes
1answer
32 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 ...
-1
votes
1answer
28 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 ...
-1
votes
1answer
27 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 ...
1
vote
1answer
39 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+ ...
1
vote
1answer
46 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!
0
votes
1answer
41 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?
1
vote
0answers
35 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
2
votes
2answers
194 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 ...
0
votes
0answers
17 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 ...
0
votes
0answers
25 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 ...
1
vote
1answer
109 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, ...
-1
votes
1answer
100 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 ...
1
vote
0answers
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 ...
0
votes
0answers
67 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), ...
2
votes
1answer
204 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 ...
-1
votes
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 ...
0
votes
1answer
293 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 ...
1
vote
0answers
25 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 ...
1
vote
1answer
148 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 ...
0
votes
2answers
80 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 $\pu{-0.74V}$ ...
0
votes
0answers
70 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 ...
1
vote
1answer
69 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 ...
1
vote
1answer
36 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 ...
0
votes
0answers
28 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-...
0
votes
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 ...
2
votes
2answers
89 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 ...
2
votes
1answer
283 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 ...
2
votes
1answer
49 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 ...
1
vote
1answer
36 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)....
-1
votes
1answer
42 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 ...
2
votes
0answers
31 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). ...
-2
votes
1answer
363 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 ...
1
vote
1answer
59 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 ...
0
votes
0answers
29 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 ...
0
votes
1answer
66 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?
1
vote
1answer
101 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 ...
0
votes
0answers
23 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?
3
votes
1answer
92 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 ...
0
votes
0answers
119 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?
0
votes
1answer
42 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 ...
2
votes
1answer
112 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 ...
3
votes
0answers
43 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
votes
1answer
539 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 ...
1
vote
2answers
104 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 ...
0
votes
1answer
45 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) ?
0
votes
1answer
58 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 ...
0
votes
1answer
47 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 ...
0
votes
0answers
47 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 ...
1
vote
1answer
99 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 ...
1
vote
0answers
207 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+}(...
