Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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Why is twice as much hydrogen produced than chlorine in the electrolysis of brine?

I have seen a great many number of diagrams which show the electrolysis of brine in a diaphragm cell, but show twice the volume of hydrogen produced. For example: On the other hand, other diagrams ...
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239 views

Can you electrolyse a single H2O molecule?

I don't know why I'm asking or why you'd want to but I'm just curious. Every resource I read about electrolysis says the reaction is $\ce{2H_2O (l) \rightarrow 2H_2 (g) +O_2 (g)}$. Can you ...
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1answer
83 views

Safe silver electroplating solutions

Are there any practical, sane and safe solutions that can be used for silver elctroplating/electrolysis that are purchasable? Objective is to create silver crystals, but without having evil cyanide ...
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1answer
200 views

How do proton exchange membrane electrolysers work?

I've seen lots of videos, animations, and a few Wikipedia pages, but I'm still trying to figure out a few things. Is an electrolyte needed to make the water conductive like an alkaline electrolyser? ...
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1answer
63 views

Water side-reactions in organic electrochemistry (redux) [closed]

(note: this is a reposting of part of my original post which I was told had too many questions in one post) Please bear with me as I am a chemistry newbie, but I am autistic and have recently ...
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1answer
147 views

Orange dust floating ontop of Electrolysis solution [closed]

While I was doing an Electrolysis experiment with stain less Anode/Cathodes on aluminium plate, Orange dust started floating on top of the water solution. What is this chemical's name and is it toxic ...
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1answer
55 views

DC Cell + Copper Wire + Ground Water

DC Cell + Copper Wire + Ground Water produces bubbles from wire and water turns rust red gradually? What is happening? I can see something is settling down...
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2answers
126 views

Can I split water without constant refill of solution?

I've looked all over the place to find a way for me to separate water without needing to put in salt. What I've found is you can separate water into hydrogen and oxygen through electrolysis (which ...
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3answers
812 views

Electrolytic rust removal

I'm currently removing rust on some bike parts so decided to use electrolysis. It's working fine, but the solution has turned a deep/dark blue whilst in most online videos it turns orange with the ...
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1answer
120 views

How can I clean up from electrolysis?

So, I was doing a little experimental electrolysis in my basement. I used 2 (presumably) galvanized steel screws as my electrodes and ran 5A through tap water with a lot of NaCl dissolved in it (to ...
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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 ...
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1answer
624 views

Electroplating copper onto steel

I'm rather unfamiliar with chemistry but I want to electroplate steel with copper. From Wikipedia: The cations associate with the anions in the solution. These cations are reduced at the cathode ...
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459 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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Coefficients in K2SO4 electrolysis scheme (textbook)

From a textbook, a scheme of $\ce{K2SO4}$ electrolysis: I don't understand how the two equations with the coefficients 2 before the water combine into the equation with the coefficient 6. Would not ...
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1answer
576 views

Why are electrolysis cell plates turning a brown color?

I have been experimenting with electrolysis for producing oxyhydrogen and using potassium carbonate as an electrolyte. After several hours of electrolysis, I notice the plates began to tarnish and ...
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175 views

knowing that a strong base is a strong electrolyte, when we add a weak acid in water, will its conjugate strong base be a strong electrolyte too?

I am not sure if the questions makes sense. What i am trying to say is that, if weak acids form strong conjugate bases, why aren't they strong electrolytes? Thank you in advance.
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Is it safe to inhale O2 from electrolysis of a pH 13.7 KOH solution?

I'm conducting electrolysis of water with a 0.25M KOH solution in water (about 14 on my pH meter) using graphite electrodes, and I was wondering if the O2 would be safe to inhale, as in an oxygen bar?
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247 views

Acrylic container and electrolysis

Normally when you do electrolysis, you would use a glass container. Would it be wise to use a acrylic container? I have one spare but not sure if this would affect the electrolysis process. Is there ...
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1answer
131 views

Increasing the length of a copper wire via electrolysis

I'm currently experimenting with copper coating using electrolysis. I'm using copper wire from my home, like the one you use for grounding. I want to electrolysis with longer copper wire (say 5 times ...
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1answer
3k views

Copper chloride color in water electrolysis?

So I tried a simple water electrolysis experiment at home, with NaCl as electrolyte, and a 12 v battery. My wires were made of copper and H2 bubbles were only forming at negative terminal(cathode) on ...
2
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1answer
358 views

Electolysis of H2O to produce O2(g), in a small, portable unit

Full disclosure, I'm just a high school chem student, but I've got this question and I couldn't find the answer anywhere online. I was reading an article about some futuristic "artificial gill", which ...
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35 views

How long does it take to turn aluminum smelters on and off?

This may fit better under "engineering," but I figured I'd start here. Aluminum is produced through an electrolysis process, and Wikipedia tells me that the electrolytic cells need constant power in ...
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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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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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2answers
1k views

Electrolysis of Water: Overvoltage?

I've heard from a few sources that over-voltage in a electrolysis cell for water will cause a greater heat buildup with no yield. Is this true, and if it is, why is it true? From my electronics ...
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1answer
81 views

Placement of Electrodes for Electrochemistry?

I'm kind of curious as to the relationship between resistance and the yield of electrochemical methods. If I have my electrodes rather close together in a conductive solution the resistance will be ...
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Creating ethane through electrolysis of vinegar

Some sources that I studied say that it is possible to produce ethane through the electrolysis of ethanoic acid. Would this work with vinegar (5-10% acid)? Also, other sources say that ethanoate ...
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46 views

Addition of anodes and cathodes in electrolysis

I am doing a research on the production of hypochlorite through an electrochemical cell using a brine feed. I know that using using an undivided cell would allow for the chlorine atoms that was ...
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1answer
875 views

Deuterium removal from water

What percentage of deuterium might be removed from water after a typical electrolysis procedure? From a post on this site I read that, "In the first stage, $\ce{NaOH}$ solution (initially $0.5\rm{M}$) ...
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1answer
85 views

Poly(3-hexyltiophene-2,5-diyl) (P3HT) reactions with inorganic salts in aqueous solution

I would need for my research at least as a starting point to know what kind of reactions occur at the interface of P3HT and an electrolyte. The electrolyte is simple $\ce{KCl}$ solution, maybe with $\...
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1answer
35 views

Is there Any Advantage to Using Multiple Steel Plates in an Electrolyzer?

If I have an electrolyzer (For water) is there any advantage to having additional steel plates in between the electrodes in solution? For some reason this appears to be a popular design and I'm not ...
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1answer
416 views

Partial Coverage During Zinc Plating Bath

I am experiencing partial coverage of a part during a DIY home zinc plating operation and was hoping someone here may be able to identify the cause of this. I am using a solution of household vinegar ...
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721 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 ...
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80 views

Reduction at the cathode

I'm learning electrolysis and we learned that the positive ions go to the cathode which is where reduction takes place. However, I got confused because when you learn about ionic bonding, the positive ...
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1answer
450 views

If you run an electrolytic cell long enough, does the conductivity decrease?

I've never seen this discussed so I wanted to ask here. Consider the electrolysis of water with inert electrodes and electrolytes that won't be oxidized or reduced, such as sodium sulfate. Since the ...
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1answer
503 views

Electrolysis of water for demonstration: ideal electrolyte for safety, stability, conductivity, and ease of maintenance

I'm developing a system for educational purposes where electrolysis of water takes place. The aim is to practically show how electrical energy can be converted to mechanical, by electrolyzing water, ...
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1answer
934 views

Why is the electrode with the lower reduction potential the cathode?

Wouldn't it make sense that the electrode with the higher reduction potential be the cathode, since reduction occurs at the cathode?
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777 views

Electrolysis of sodium chloride solution [closed]

I am trying to understand electrolysis. My question is: when electrolysis is done with a NaCl solution I have learnt that sodium metal is not formed. Why is this?
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370 views

In electrolysis, why is hydroxide oxidised in preference to anything(?) but halides?

In electrolysis of aqueous solutions, I can loosely explain what happens at the cathode in terms of reactivity - any metal more reactive than hydrogen stays in solution, effectively because they're ...
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1answer
5k views

Why does the copper anode dissolve?

In such a setup, the copper anode is known to dissolve. My question is, why? Does it not receive electrons from the $ \ce{OH^-}$ ions. And if you say that those electrons just flow to the battery, let ...
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1answer
2k views

Products of Electrolysis of NaCl

I have gone online to see many times that the electrolysis of $\ce{NaCl}$ dissolved in water produces Lye: $$\ce{2NaCl + 2H2O -> 2NaOH + H2 + Cl2}$$ Other times $\ce{NaClO3}$ or some other compound....
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1answer
147 views

Soil batteries?

In an attempt to demonstrate the basic principles of common batteries, my teacher assigned me to demonstrate a simple experiment to the kids at the elementary school. A tank filled with saltwater, ...
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1answer
294 views

What electrodes to use to minimise corrosion during water electrolysis?

I did the $\ce{H2O}$ electrolysis experiment a few times, but every time a huge amount of the oxygen reacted with its corresponding electrode. What material should the electrode be made of in order to ...
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1answer
60 views

Can I electrolyze saturated sodium hydroxide?

Can I electrolyze saturated $\ce{NaOH(aq)}$? My guess is that I can't because in the aqueous solution, the concentration of $\ce{OH-}$ is too high and thus there isn't enough $\ce{H+}$ remaining.
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616 views

Dissociation of zinc anode during electrolysis

Example electrolysis setting: Cathode: copper Anode: zinc Electrolyte: dilute aqueous sodium chloride [$\ce{NaCl(aq)}$] During electrolysis, zinc is more reactive than copper, hence electron flows ...
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633 views

Electrolysis, Concentration of Electrolytes

So it says the Chlorine gets discharged as the concentration of chlorine ions are higher than OH ions, but why don't the concentration applies to Na+ ??
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1answer
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Which is the Electrolyse Reaction?

$$\ce{NaOH +H2O->H2 +O2 +NaOH}$$ We know that $\ce{H+}$ and $\ce{OH-}$ go to the cathode and anode, but how can I write the total reaction? Is it: $$\ce{2NaOH +2H2O->2H2 +O2 +2NaOH}$$ I've put ...
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Why do hydroxyl ions migrate towards the anode in a Bacon Cell?

Why do hydroxyl ions in a Bacon cell migrate towards the anode? Is it because of the relative concentration of the different ions in the set-up? According to the set-up of the bacon cell, the anode is ...
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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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5answers
6k views

Does the electrolysis of water produce chlorine gas?

http://orbitingfrog.com/2014/11/02/electrolysis-of-water-with-pencils-and-a-9v-battery/ This article seems to indicate that "a small amount of Chlorine may be produced as you [perform electrolysis on ...