Questions tagged [electrolysis]
For questions about the chemical concepts of electrolysis.
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How current flow over electrolyte
In our textbook they give a simple definition of electricity
Electricity is just the flow of electrons.
But when they give me the definition of electrolyte.
They said that here electricity is flow ...
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Residual current in electrolysis
On this site: https://water.lsbu.ac.uk/water/electrolysis.html there is a graph showing current-voltage characteristic for electrolysis of water:
I am wondering, if I apply voltage lower than ...
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Using sodium metasilicate as a non-reactive reusable electrolyte in water electrolysis
I'm trying to increase the transport of electricity in the tap water I use in my dry cell electrolyser. Table salt is out, as it rusts the stainless steel electrodes and produces toxic gasses. Lye is ...
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How to determine uncompensated or solution resistance of a 3 electrode setup for IR correction?
To correct for ohmic losses from the potential drop across the electrolyte due to the distance between the electrodes, electrochemical impedance spectroscopy (EIS) is typically employed to measure ...
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Temperature and electrolysis
Based on my understanding, metals conduct electricity better at lower temperatures than at higher temperatures as the resistance to electron flow is lower.
Then, what about ionic compounds? Do they ...
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Gallium & Electrolysis
Preface this with I'm a chemistry newb. Ive finished chem I and II and did extremely well, but I think that means I know just enough to get myself in trouble....Also, sorry if this is a little long. I'...
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Electrolysis of gasoline (or other uniform liquid hydrocarbon) [closed]
Electrolysis, when I usually search about it, is almost exclusively interested in splitting $\ce{H2O}$. However, looking at the Wikipedia article on electrolysis, it seems like it works for a bunch of ...
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Is potassium Sulfate a good electrolyte for the production of oxy-hydrogen?
I am currently conducting an electrolysis experiment using a 30 amp power supply with a voltage ranging from 10 to 16 volts.I am thinking of using potassium sulfate (K2SO4) dissolved in water as an ...
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Electrolysis of Copper (II) Sulfate Solution with graphite electrodes
In the electrolysis of Copper (II) Sulfate solution with inert graphite electrodes, the electrons from the power pack will first go to cathode. I understand what happens at the cathode - the copper ...
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Proton Exchange Membrane H2 generator transports too much water to output
I am using a PEM cell to generate H2 (eventually D2). The PEM cell is fed water on the cathode (O2 side) only, but it transports about 3.5x as much water over to the cathode (H2 side) as it actually ...
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If Standard Reduction Potential and Standard Oxidation potential are equal in magnitude and opposite in sign?
If Standard Reduction Potential(SRP) and Standard Oxidation potential(SOP) are equal in magnitude and opposite in sign ,
Then as per this
As we know SRP of H2O is -0.83 V as per this SOP of H2O should ...
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What parameters do you use to find the order in which elements will leave a solution during electrolysis?
I am looking to perform electrolysis on a molten solution of many elements, specifically a mix of iron, sodium, potassium, silicon, aluminum, and titanium oxides and chlorides. What I'm trying to ...
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Which reaction would take place if we sent electric current IN a voltaic cell, electrolysing it?
I know how the voltaic cell normally works, producing current. It is not what I'm asking about. I know that normally, the Zinc electrode slowly dissolves (it is anode, $\ce{Zn -2e^- -> Zn^{2+}}$), ...
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Does a porous medium have to be charged in order for the fluid to establish the streaming potential?
In Wikipedia, I read:
Adjacent to the channel walls, the charge-neutrality of the liquid is
violated due to the presence of the electrical double layer: a thin
layer of counterions attracted by the ...
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Explanation of colours of solder plated copper pads after electrolysing a circuit board in NaCl solution
A last ditch method for identifying connections in a old multilayer circuit board that I have come up with, when you have a spare, is to put the board in salt (NaCl) solution and connect a power ...
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Can copper hydroxide be formed as a byproduct of water electrolysis?
I was electrolysing water with a 12v DC power supply at about 3 milliamps, using copper wire for both my anode and cathode. The solution was about 17 grams of table salt in 750 milliliters of purified ...
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Passing protons through cation-permeable membranes
Protons are attached to a water molecule (making hydronium) in acidic solutions. If a container was split through the middle with a cation-permeable but anion impermeable membrane and, say, HCl was ...
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Electrolysis of Solutions
So far I've only encountered formulas to solve for solutions of single molecules while learning about electrolysis, i.e. H2O or FeCl3. This generally has involved determining the resultants, ...
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Do formed galvanic cells counteract electrolysis?
I was wondering about the following:
Suppose we carry out an electrolysis with constant applied voltage. During the process, a galvanic cell should be formed by the reactants which are formed during ...
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I have been able to make sulfuric acid from alum using a membrane cell. What else other than alum can I use to improve yields
Here is how I was able to make sulfuric acid.
A membrane cell was made by placing a earthen clay pot in a larger vessel.
1.Make concentrated solution of potash alum.
2.Pour alum sol into both sides of ...
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Electrode potential and likeliness to reduce/oxidize (electrolysis) [closed]
I'm a little confused about situations where multiple chemical compounds can be reduced/oxidized and the likelihood of this happening to one compound over the others, depending on the electrode ...
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When refining copper through electrolysis, do the copper ions from the electrolyte copper sulfate get reduced at the anode?
Copper sulfate is the electrolyte that is brought up most commonly when we talk about the refining of copper. Do any of the copper ions from the copper sulfate solution reduce at the anode like the ...
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What are the outputs of single-chamber brine electrolysis?
From my googling around, the internet states, with extremely high confidence, two different mutually exclusive sets of outputs for single-chamber electrolysis of salt water. (Well, plus a bunch of ...
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Can deuterium be separated from heavy water via electrolysis? It is an isotope of hydrogen, so I guess it should act in the same way?
I was wondering if it is possible to separate deuterium from heavy water via electrolysis.
Also, is this the way deuterium gas is obtained on an industrial scale, or are there better methods?
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Removing Copper from drinking water by Electrolysis? What to keep in mind?
The drinking water in my flat contains a lot of copper. Although the amount of copper is around the allowed limit 2mg/l I would prefer to reduce it.
I know that it is at this value from a paid ...
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Pourbaix Diagram and Galvanic Cell
I am trying to understand how a galvanic cell where copper and mild steel are linked occurs. It seems that on most galvanic series, Fe and Cu are far enough apart (>.2V difference) that Fe would ...
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Is there any process that converts water into hydrogen and oxygen by using light and a catalyst?
Can water be converted into hydrogen and oxygen using sunlight and a specific catalyst? I can imagine a electrolysis reaction using a catalyst that uses light to release electrons. The goal is to find ...
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Are electrodes in an electrolysis unique for every electrolyte or can any random electrode be used with an electrolyte during electrolysis
For example, during the electrolysis of water, platinum electrodes are used, why can't I use any other electrode as long as they are conductors? why does some electrolysis require specific electrodes ...
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Why does lead gains electrons in the cathode? [closed]
In lead(II) bromide electrolysis, lead is attracted to the cathode and gains electrons. Why does it gain electrons when losing them would be easier since its charge is +2 meaning it would need to lose ...
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Is anodizing of mixed metals (aluminium and cooper) possible?
I'd like to blacken my Noctua NH-P1 passive cooler, made from an aluminium fins and copper heatpipes. Since thermal dissipation is key in my build, I thought about anodizing it, instead of spray paint ...
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Electrolysis of water+salt: Which molecules is the product?
I should show the kids how electrolysis could create $\ce{H2}$.
We used a drinking glass of water mixed with salt. Then we put an 1.5 volt AA battery in the glass and the electrolysis was visible ...
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Kolbe's electrolysis reaction for alkenes' production
I came across a question in which the major product was asked for Kolbe's electrolysis of potassium salt of 2,3-dimethylbutane-1,4-dioic acid. The answer was given as trans-(but-2-ene). I couldn't ...
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How can I produce Red Iron oxide with electrolysis
I am producing Iron Oxide with the intention of using it for pigmentation. My attempts so far have been to use electrolysis. My first attempt I used Borax as an electrolyte and a 12 volt adapter with ...
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What happens to undissolved salt during electrolysis of brine?
Say we have a container of brine with excess NaCl in the anode, and a seperate container with just water at the cathode. Both are connected by a salt bridge. If we perform electrolysis, Sodium ions ...
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When performing electrolysis of brine, are carbon steel electrodes ok? [closed]
Are carbon steel electrodes better? Do they both eventually corrode? Is there any cheap electrode that stays inert indefinitely?
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Why is copper discharged in the electrolysis of copper (II) sulphate solution instead of hydrogen?
In the electrolysis of copper (II) sulphate with graphite electrodes, I am confused why copper ions are discharged and form copper metal at the cathode. As far as I know hydrogen ions have a lower ...
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Do ion-exchange membranes *always* require ions to pass in both directions?
In an answer to this question, it was asserted that:
Student always tend to forget that a solution must remain electrically neutral by all means. If you want a certain ion to leave water, you must ...
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What endothermic reactions can be effectively reversed by electrolysis?
Not only newbie, but total layman here; please be patient with me.
Given are either two different elements, two different molecules, or one element and one molecule (chemical A and chemical B). A and ...
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Electrolysis when E_cell = 0
I'm a bit confused by the electroplating of Zinc onto Copper, with Zinc (anode) and Copper (cathode) electrodes in a Zn(NO3)2 solution.
The reduction reaction is: Zn2+ + 2e- ---> Zn (s) (E_rxn = -0....
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Electrolysis with salt water on steel plates creates horrible black liquid
We are doing an electrolysis experiment using distilled water with sea salt on clean stainless steel plates. A horrible black gunk has formed in the water, very quickly. What is this?
I don't ...
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Gouy-Chapman model
Recently I have been investigating the problem of a neutral solutions (with equal number of anions and cations) interacting with an infinite surface $z=0$ with electrostatic potential $\phi(z=0)=\...
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How are membranes for Polymer electrolyte membrane electrolysis produced?
Polymer electrolyte membrane electrolysis is a process used for creating hydrogen with a thin metal membrane. This membrane is often includes a thin metal sheet of Platinum. My question is, how these ...
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What metals are safe to use as electrodes when doing electrolysis of water (I am trying to produce hydrogen gas)
I am going to be a DC power converter (with fairly high voltage and amps) to turn water into hydrogen (and oxygen) gases. However I have a few questions about the safety of this process.
What ...
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Can sodium sulfate be used in the salt bridge?
My book mentions sodium sulfate ($\ce{Na2SO4}$) as an electrolyte that can be used in a salt bridge. I'm asking this question because ChemLibreTexts says that
It is also important that the charge ...
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Is H2 gas produced when a mercury electrode is used as cathode in the electrolysis of Brine?
If platinum electrodes are used as electrodes, H2 gas and Cl2 gas are produced at the anode and cathode respectively.
However, if a mercury electrode is used as the cathode, an exception is seen. ...
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What will happen if the electrolysis of Brine takes place for a long time?
This is the reaction:
$$\ce{2NaCl(aq) + 2H2O(l) -> 2NaOH(aq) + H2(g) + Cl2(g)}$$
If the above reaction goes on for long enough, we will eventually run out of Cl- ions. There will only remain an ...
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Will an electrolyte eventually stop conducting electricity? And if so, gradually over time or suddenly?
I understand that an electrolyte does not conduct electrons, but rather that the positive and negative dissolved ions are attracted by electric charge to the cathode and anode where they receive and ...
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Relationship between cell potential and applied potential in electrolysis
My question is about this problem, and I got the correct answer (which is 495g), but I am confused about the concept behind the correct approach:
"Calcium metal is obtained by the direct ...
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Concentration of copper ions in refining of copper metal during electrolysis
When refining copper, would there be a circumstance when the concentration of copper ions in the electrolyte drop? I only know that when refining copper the color of the solution should remain the ...
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Is there a recommended frequency when driving an alkaline water electrolyzer?
We are designing a small electrolyzer (about 1 kW input power) for HHO gas generation.
Sadly most of the literature online is bordering on the snake oil… However, it works fine with DC driving. Now ...
