Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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121 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
791 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
112 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
597 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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0answers
453 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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2k views

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
568 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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409 views

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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237 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
124 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 ...
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1answer
325 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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0answers
34 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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3k 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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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
80 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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4k views

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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0answers
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
835 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
84 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
401 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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692 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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1answer
76 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
438 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
498 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
920 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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2answers
742 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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359 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
1k 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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139 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
279 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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1answer
597 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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622 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
48 views

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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0answers
55 views

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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59 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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5answers
5k 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 ...
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2answers
413 views

Is it possible to have electric field in water without having electrolysis?

Is it possible to have electric field in water (using electrodes with voltage difference) without having electrolysis in the water (or any other reaction)?
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938 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 ...
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2answers
239 views

Recovery and Disposal of Unknown Copper Compound

About a month ago, I ran a small electrolysis experiment in an old fish bowl with a $\ce{MgSO4}$ electrolyte and copper electrodes. It ran for about 3-4 hours. Now, a month later, I am left with ...
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54 views

What will the results be if I electrolyzed brine with these materials?

I have tried electrolyzing saltwater (brine) with copper electrodes, but I got a rusty sludge and hydrogen being produced at the anode. I read about it and it is just dissolved copper, possibly ...
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131 views

CuCl via electrolysis of HCl

I need a solution of CuCl in HCl. Since CuCl reagent is such a pain to source and work with (because it oxidizes so quickly) I was thinking that I could create the solution simply via electrolysis of ...
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2answers
5k views

What current and voltage are best for electrolysis rust removal?

I weld carbon steels all the time, and sometimes I get parts from the scrapyard. Unfortunately, these parts are generally oxidized, so I've been assembling an electrolysis tank for it. This tank ...
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1answer
8k views

Calculate how much hydrogen or oxygen will be produced in the electrolysis of water

Is there a way to exactly calculate the quantity of hydrogen or oxygen in a water electrolysis? I am thinking of a plain and simple electrolysis like an anode and kathode in salted water separating ...