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Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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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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16 views

Cheaper ionic membranes

I am trying to make sodium hydroxide by electrolyzing table salt. I learned that I need cation exchange membrane (CEM) to prevent Cl- from crossing over to the cathode. The only example of CEM that I ...
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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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What is the optimal pH for electrolysis? [closed]

I am Electro etching some metal and I'm trying to find the optimal pH / optimal DIY mixture for a cost-effective electrolyte.
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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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Why does only Hydrogen appear in the negative electrode my water electrolysis

Using this apparatus I conducted a water electrolysis. The aluminum foil curve surface is my negative electrode and the copper wire is the positive. The apparatus is submerged in tap water, but the ...
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34 views

Does electrolysis of aqueous tin (II) chloride produce Cl2 or 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{...
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What can be done to the residuals from an electrolytic solution or more precisely how to make the solution reusable again?

In any electrolytic reaction anode goes for oxidation and cathode goes for reduction. The aftermath of this natural behaviour of the solution leads to an unclean(mother) solution which has to be ...
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47 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
27 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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85 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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31 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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120 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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10 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
45 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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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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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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92 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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66 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 (...
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52 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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1answer
148 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: 2 cups distilled water, with 3 grams of copper wire on ...
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30 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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130 views

What happens to iron electrodes (attached to a battery) in Copper 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 ...
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174 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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65 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
167 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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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
74 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 ...
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280 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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144 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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9 views

What material electrode is best suited for high current density aqeuous Bromide electrolysis?

I have found that the anodic breakdown potential of Titanium in the presence of Bromide ions is around 1 volt - too low for practical application. Tantalum sounds much more promising when considering ...
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3answers
73 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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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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Electrolysis Layers Identification

So I'm working on making some good quality rust (iron oxide). I filled a clean mason jar with tap water. We have well water here which does contain some iron and some calcium. I dissolved about 1/2 ...
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770 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
141 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 ...
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1answer
114 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 ...
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1answer
43 views

Hexagonal water, alkaline ionized water

I am chemical engineering and i care my nutrition and health. in my opinion, it is so important that what we drink or eat daily. Respectfully, I have a question about alkaline ionized water bottle, ...
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101 views

Would stainless steel corrode in this electrolytic cell I designed? [closed]

As far as I know, stainless steel is resistant to corrosion due to an inert oxide layer formed by the other alloy metals. I am learning about redox reactions right now so I am no expert; but since ...
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1answer
50 views

Electrical conductance of NaCl solution [closed]

I'd like to ask whether EC of a salt solution of iodized table salt differs from that of uniodized and to what extent?
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257 views

Can you create pure sodium metal by electrolysis of aqueous NaCl rather than molten NaCl?

I was researching how to make pure sodium from salt because I think it would be interesting to do. In all of the articles I read that talked about using NaCl they said to melt it and then use ...
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3answers
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How does pH change during the electrolysis of water? [closed]

How does the pH change during electrolysis of a water and magnesium sulphate solution? Also, will this pH change happen every time? Does the pH change differently when there is just water in the ...
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2k 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 ...
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1answer
89 views

Electrolysis of Potassium Iodate/Hydrogen Peroxide in Briggs-Rauscher Oscillation

I would like to investigate the effect of adding a voltage in the Briggs-Rauscher oscillation reaction. I will examine the oscillations visually. The ingredients I will use include potassium iodate, ...
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61 views

Electrolysis under high pressure

Suppose we submerge a bell-shaped electrolysis chamber, flip it under water to have it filled with water, flip it again (so that the top is closed and the bottom is open), and lower it deep into weak ...
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1answer
178 views

What is the greenish substance formed after the electrolysis of two graphite electrodes in a sodium sulphate solution?

Today at school we tried the electrolysis with two graphite electrodes in a sodium sulphate solution. We put the electrodes in two test tubes and filled them with some more sodium sulphate so that the ...
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18 views

Suitable anode materials for electrolysis of water [duplicate]

I'm planning to electrolyze water as a personal project, but I'm not sure what materials can be used for my anode. I've heard stainless steel can produce hexavalent chromium, and noble metals like ...
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1answer
664 views

Best Settings for Electrolysis of water

I want to electrolyze water as a personal project, but I have found conflicting power recommendations on google. Some sources recommended a higher voltage, claiming that higher amps will just destroy ...
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39 views

Determining the theoretical mass of gas produced through the process of electrolysis

I have a question that has been stumping me for quite some time. I wish to calculate the mass of gas that is produced from varying concentrations of salt (NaCl) through the process of electrolysis. I ...
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323 views

Does the concentration of sulfuric acid in a lead-acid storage cell affect its discharge and recharge?

I'm trying to come up with ideas for an experiment involving the lead acid storage cell. According to the net equation (forward is discharge), $$\ce{Pb + PbO2 + 4 H+ + 2 SO4^2- <=> 2 PbSO4 + 2 ...