Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

96 questions with no upvoted or accepted answers
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7
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283 views

How much CO2 is created during water electrolysis with a graphite anode?

I'm experimenting with water electrolysis and wanted to use non-toxic materials, so I settled on pure graphite rods for both electrodes and Epsom salt (magnesium sulfate) as the electrolyte. The ...
7
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2answers
1k views

Nernst equation for a fuel cell when gases are stored separately

I have run some tests with a PEM fuel cell and the voltage we have found was $1.44\ \mathrm{V}$. Given that the standard potential for a fuel cell is $1.229\ \mathrm{V}$ what is causing the difference ...
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0answers
125 views

Thought Experiment: Is it possible to preserve the charge imbalance present during molten lead(II) bromide electrolysis?

Suppose I were to electrolyse some molten lead(II) bromide. According to what I have been taught, the lead ions travel towards the cathode and are reduced at it, while the bromide ions are oxidised at ...
5
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0answers
80 views

Autocatalysis / Electroless plating of mercury

As a project I am trying to plate mercury onto a powdered metal amalgam of $\ce{Cu}$ & $\ce{Ag}$. I am using solution of $\ce{HgCl2}$ in normal $\ce{HCl}$ (a reducing agent), Any thoughts for ...
5
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0answers
268 views

Reduction of vanadyl ion

I want to reduce vanadyl to vanadium (III), can somebody please suggest some appropriate methods for it? I am trying to make a redox flow battery for a project but I have only vanadyl sulfate.
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0answers
818 views

An alternate purification process for sugar separation form bee honey?

Bee honey contains 75% sugars (Fructose, Glucose, Maltose, Sucrose and others), some water and low amount of different compounds (up to 5%) Wiki. Basic purification is done by addition of phosphoric ...
4
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0answers
1k views

Does the temperature of water change during electrolysis?

Applying an electric potential to impure water splits water into its constituents H/O. Does the temperature of the electrolyte change during this electrolysis?
3
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0answers
24 views

Orange flakes forming after salt water electrolysis with rusty iron electrodes

I am using two old iron bars, rusty from the years, into a solution of tap water saturated with NaCl. After a few minutes at 32.6V and between 1 and 2 Ampere, I get a clear looking yellowish solution,...
3
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62 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 ...
3
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1answer
213 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
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0answers
73 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 ...
3
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0answers
103 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 ...
3
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0answers
295 views

Does Reduction Potential affect rate of electrolysis

I am currently doing a project on electrolysis, and I was wondering if the reduction potential (ie. $E^0$) will affect the rate of electrolysis. In other words, across different cells with differing $...
3
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0answers
152 views

White mucous substance forming around iron paper clip during electrolysis

I'm using a graphite cathode and an iron paper-clip anode, in a saltwater solution, basically to produce rust. I've done this before with no complications, but this time I noticed a white, mucous ...
3
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0answers
66 views

Can a brine water electrolysis be looped?

Electrolysis of brine yields hydrogen and chlorine gases and aqueous $\ce{NaOH}$. So is it possible to combine the gases to form $\ce{HCl}$ gas, and mix it back with the aqueous $\ce{NaOH}$, so it ...
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1k views

How can I dissolve copper but not zinc?

I have a zinc-body garden spray head with a brass garden hose thread stuck inside. This is actually an irritatingly common problem. Which got me wondering: What chemical means exist to dissolve ...
3
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0answers
1k views

Does Temperature Affect Rate of Reaction of Electrolytic Cell

I completed an electrolysis experiment. I used copper electrodes and a copper sulphate solution, and my independant variable was the temperature of the electrolyte. I was just wondering if increasing ...
3
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0answers
44 views

Does Fluoroborate gets used up in Electroplating

I've been working on Tin electroplating on the side for a while now. I've formulated a mix from my usual electroplating formula template. The mix stubbornly keeps on having the Tin ions form Tin ...
3
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94 views

Catering grade electrolysis of alcohol

Would the electrolysis of alcohol, specifically spirits, result in a potable end product? I'm looking for some novel cocktail ingredients.
3
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1answer
92 views

Why does Hg form amalgam in electrolysis?

In a class of electrolysis, my instructor told me that Hg forms Na-Hg in the electrolysis of dilute NaCl aqueous solution. For this reason, sodium cations are reduced in the cathode instead of ...
2
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0answers
56 views

Effect of charge density on electrolysis of dilute sulphuric acid

I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen: $$\ce{2 HSO4- -> H2S2O8 +...
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0answers
67 views

Possible side reactions in electrolysis of concentrated NaCl

This is a very basic question about which side reactions can take place if the electrodes are not shielded from each other during electrolysis of concentrated $\ce{NaCl}$. So, this is the desired net ...
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18 views

Can I use an electrolyte containing a different cation from the anode when doing an electroplating experiment?

For example, I want to purify copper. So the anode will be impure copper and cathode will be pure copper. However, instead of using copper sulphate/halides/nitrate solution, can I use magnesium ...
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32 views

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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0answers
54 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
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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 ...
2
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0answers
115 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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0answers
8k views

Electrolysis of concentrated sulphuric acid

In my textbook it is given that for electrolysis of dilute sulfuric acid at anode following reactions can occur: At moderate concentrations $\ce{2H2O -> O2 + H+ +4 e-}$ And for high ...
2
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0answers
408 views

Copper (II) oxide during CuSO4 electrolysis

I was performing copper (II) sulfate electrolysis (graphite electrodes; 10V; 0,01A) today and I observed black precipitate falling from around cathode. I suppose it's copper(II) oxide. I couldn't find ...
2
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0answers
2k views

Electrolysis of molten sodium iodide

Electrodes: Zinc electrodes Electrolyte: molten sodium iodide I know that at the cathode, sodium metal will be formed because only sodium ions are present for reduction. At the anode, originally ...
2
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0answers
492 views

Electrolysis of dilute and concentrated sodium chloride and the Nernst equation

Interested to know if there is a critical concentration at which $\ce{Cl-}$ will oxidise over $\ce{H2O}$ and if this can be determined using the Nernst equation. That is, obviously if $[\ce{Cl-}]>...
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0answers
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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0answers
3k views

Electrolysis of concentrated NaCl

I conducted an experiment on electrolysis of concentrated solution of NaCl. Hoffman Electrolysis Apparatus was used for this experiment. I observed a formation of gas bubbles on both anode and cathode....
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21 views

What is the relationship between current flow and low AC voltages within electrolyte solutions

I have recently been trying to find references or textbooks which may explain the principles of electrical current conductance within an electrolyte solution when low AC voltages are induced. Does ...
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1answer
44 views

Electrolysis using electrodes of metals whose ions are in solution

So when we perform electrolysis of say an aqueous solution of silver nitrate with silver electrodes, silver ions having a greater reduction potential than water, accepts electrons and deposits at the ...
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0answers
49 views

Are the reactions in a simple cell overall exothermic? Why?

For context, I'm in high school. I'm trying to mentally connect electrolysis with the concept of energy changes and kinda having trouble. I understand the bottom line is that a simple cell converts ...
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0answers
20 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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0answers
28 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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0answers
388 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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0answers
900 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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0answers
391 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
327 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 ...
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0answers
54 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 ...
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0answers
138 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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291 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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0answers
38 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
3k 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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33 views

What would affect the rate of recharge of a lead-acid battery?

I am trying to perform an investigation regarding lead-acid batteries and would like to specifically look into the recharging mechanism. However, I realised that this might be quite difficult since ...
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0answers
142 views

Cation falling off electrode after electrolysis

I'm trying to find the electrochemical equivalent for zinc in an experiment. I am carrying out electrolysis of zinc sulfate solution. According to Faraday's law, m=zq. I made a 0.1 M solution and ...
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0answers
158 views

Problem in anode in experiment of electrolysis of brass

I am studying the electrolytic determination of copper content in brass (~58% copper, ~40% Zn and other trace elements) by using standard method BS EN 16117-1:2011. Now the electrode used for the ...