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Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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High voltage arc treatment leads to the appearance of fluorescent granules in soda baking. Perhaps it's the F-centers?

I have a high-voltage converter at home, consisting of a horizontal "flyback" transformer from an old tube TV, field-effect power transistors and a square-wave generator with adjustable ...
Nikita Danilov's user avatar
4 votes
1 answer
86 views

Why is my Ni or Fe cathode blackening and pores getting blocked during alkaline (6 M KOH) electrolysis?

I am conducting an electrolysis process for hydrogen $(\ce{H2})$ and oxygen $(\ce{O2})$ generation using a $\pu{6 M}$ $\ce{KOH}$ alkaline solution. During the process, I have observed that my cathode ...
Bhavik Modi's user avatar
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0 answers
40 views

How do 2 beaker electrolytic cells work?

I've never seen a 2 cell eletrolytic cell before. I am comfortable with how a 1 cell (standard) electrolytic cell works. But I have never seen this before: Electrodes P and Q are made of metal M. ...
John Hon's user avatar
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2 votes
1 answer
34 views

Experiment on pH vs Rate of Electrolysis - what do the results actually say?

My experimental setup looks at using different pH solutions (of $\ce{H2SO4}$ and $\ce{NaOH}$) for electrolysis of water with a Hoffman setup and then measuring the rate of production of gas (note this ...
Eshwar Kolli's user avatar
0 votes
0 answers
28 views

Why is a basic (not acidic) electrolyte frequently suggested for electrolytic de-rusting of metal or iron objects?

For home or do-it-yourself electrolytic de-rusting of steel or iron objects, the use of a soda-based electrolyte, such as "washing soda" (sodium carbonate) is almost always mentioned. I have ...
Peggy Schafer's user avatar
-1 votes
0 answers
36 views

Why can't chromium (chrome) be coated on objects with simple hot-dip galvanization?

I have had to learn a lot about why it is difficult to do electroplating with chromium, it's low electrolytic efficiency, etc., but one simple thing eludes me... Why involve electrochemistry at all? ...
Kurt Hikes's user avatar
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9 votes
2 answers
840 views

Electrolysis experiment with CuSO4

I'm doing an electrolysis experiment with an aqueous solution of copper sulfate $\ce{CuSO4}$ and graphite electrodes. I thought that only metallic copper was formed at the cathode (and oxygen at the ...
Andrea's user avatar
  • 209
-1 votes
1 answer
75 views

Electrolyte in Electrolysis of CuSO4 [closed]

I have 2 questions regarding electrolyte used in electrolytic refining of copper: I was reading metallurgy of copper and I noticed that in electrolytic refining we use acidified aqueous $\ce{CuSO_4}$ ...
Amit's user avatar
  • 373
8 votes
1 answer
714 views

What happens to an ongoing electrolysis when you turn off the battery?

Suppose you do an electrolysis experiment, where you have two carbon electrodes, a battery, and water in a which a strong electrolyte, like NaCl, is dissolved. The circuit is closed and the ...
dark_ursus's user avatar
2 votes
0 answers
33 views

Is there any method to make sure a electroplated layer of iron oxidizes into magnetite (Fe3O4) instead of hematite (Fe2O3)?

I am currently electroplating iron on copper using a DIY setup in my lab. Steel sheet as anode with electrolyte having 5% acetic acid with sodium carbonate to form sodium acetate and added some NaCl ...
assasinchop7's user avatar
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1 answer
54 views

Does electrode material affect efficiency of water electrolysis?

I've been creating hydrogen via electrolysis of water, using pure nickel strips as electrodes, in a sodium hydroxide solution. (These nickel strips are commonly sold for use in battery packs). I'm ...
MadScientist's user avatar
0 votes
2 answers
81 views

Fundamental understanding of electrode potentials

The electrical double layer, is commonly used to describe the origins of electric potentials that is fundamental to electrochemistry. This model is quite outdated from my understanding, but it is ...
Stark's user avatar
  • 95
0 votes
2 answers
35 views

Electrolysis to refine metals

Why does the cathode get bigger and the anode smaller when we use copper electrodes for the electrolysis of Copper Sulphate? Why does the anode not receive electrons from the anions (e.g Sulphate and ...
21e1e2's user avatar
  • 1
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0 answers
39 views

Electrolytic Substrate modification to enhance corrosion resistant of reactive metal

So, I was working on a project lately. The project I was working on involves the utilization of inexpensive, non-toxic, and inert electrodes. Unfortunately, the only substrates I have access to are ...
Ananiya J. Kesto's user avatar
4 votes
2 answers
555 views

Why aren’t electrolyzers made like this(two inter-locking coils)?

The maximum current(based on how long you want your electrolyzer to last) is based on the electrode size according to my minimal research. The larger the electrode the more current is allowed. So why ...
Anish Kommireddy's user avatar
-2 votes
1 answer
42 views

Water electrolysis with in-series electrodes

I'm trying to improve my efficiency when doing water electrolysis. For my specific application, I don't need to separate the hydrogen and oxygen gasses, in fact it's important that I don't. But it's ...
user142480's user avatar
0 votes
0 answers
47 views

How to calculate theoretical value of mass output using electrolysis with different electrolyte concentrations?

I am writing a research paper on a zinc-copper electrolysis experiment observing the mass output of Zinc on a copper cathode, in which I am changing the concentration of the zincsulfate electrolytic ...
user142120's user avatar
0 votes
1 answer
107 views

Charge as a function of time in electrolysis

According to Faraday's laws of electrolysis, $\frac{Q}{Z}$ = no. of moles of substance released (n), where Z is n-factor x 96500. Assuming the electrolyte is a strong electrolyte, specific ...
chocolate kiwi's user avatar
-1 votes
1 answer
73 views

Effects on pressure on reverse electrolysis

I am interested in the effects on pressure of the following reaction. $$\ce{O2 + 4H+ + 4e- → 2H2O}$$ I have been trying to find data on this for a while, and I am sure that the information exists, but ...
Evelyn21's user avatar
-2 votes
1 answer
45 views

Electrolysing two salts with the same anion

Assume that I prepare solutions of sodium chloride (NaCl) and potassium chloride (KCl) in equal molarity, then combine them together to form a single homogeneous mixture. Then I electrolyse this ...
Youstay Igo's user avatar
0 votes
1 answer
45 views

Electroless plating

One of the simple methods to plate metal layers onto non-conductive surfaces is to attach graphite onto the surface. And this is what we call electroless plating. Here, I take the electroless plating ...
Freeby Freeby's user avatar
-3 votes
2 answers
273 views

Can a multimeter be used to measure PH?

I would like to feed my garden a solution of water and Trisodium Phosphate (TSP), but I am uncertain of the correct amount of TSP to water ratio. Too acidic or too basic of a solution can harm my ...
user148298's user avatar
2 votes
1 answer
160 views

Find cell configuration notation for permanganate in acidic medium

They gave us an unbalanced reaction of permanganate and iodide in acidic medium, and ask to balance the reaction using redox methods and the write the cell configuration notation for the resultant ...
creepshow's user avatar
2 votes
0 answers
82 views

Electrolysis with sodium acetate solution - pH stratified layers - what happened?

I electrolyzed 0.5M CH₃COONa in an H-Cell with a pH-sensitive dye using platinum electrodes. From the attached pic, you can see that an acidic layer formed at the top of the anode solution, while an ...
jec2023's user avatar
  • 21
-4 votes
1 answer
43 views

Why does water present in aqueous solution of CuSO4 ionize into H+ and OH- during its electrolysis?

It’s written in books that during electrolysis of aqueous solutions of $\ce{CuSO4}$ or $\ce{NiSO4}$, the water particles ionize into $\ce{H^+}$ and $\ce{OH^-}$ ions along with dissociation of the ...
Arbinda's user avatar
-2 votes
1 answer
66 views

Did my electrolysis experiment produce NaOH? [closed]

I recently conducted an electrolysis experiment on saltwater, hoping to obtain chlorine gas and sodium hydroxide. The experiment ran for approximately 12 hours, powered by a 9V battery. To my surprise,...
CarbonatNatria's user avatar
0 votes
0 answers
52 views

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 ...
pajacol's user avatar
  • 83
4 votes
1 answer
273 views

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 ...
Ron McDonald's user avatar
3 votes
1 answer
131 views

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 ...
Daniel Leo's user avatar
0 votes
1 answer
62 views

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 ...
Chemistry student's user avatar
-2 votes
1 answer
278 views

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'...
David's user avatar
  • 5
2 votes
0 answers
228 views

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 ...
G. Putnam's user avatar
  • 175
1 vote
3 answers
258 views

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 ...
Noah's user avatar
  • 29
-2 votes
1 answer
738 views

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 ...
Jay Chen's user avatar
1 vote
0 answers
41 views

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 ...
Eric Slighton's user avatar
-5 votes
2 answers
270 views

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 ...
Test Test's user avatar
3 votes
0 answers
33 views

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 ...
Lark's user avatar
  • 31
0 votes
1 answer
102 views

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, $\ce{Zn -2e^- -> Zn^{2+}}$), ...
Petr L.'s user avatar
  • 127
0 votes
0 answers
39 views

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 ...
user134613's user avatar
1 vote
0 answers
22 views

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 ...
REPuzzle's user avatar
0 votes
1 answer
162 views

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 ...
Taxolotl's user avatar
0 votes
1 answer
49 views

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 ...
Video Carp's user avatar
-1 votes
2 answers
69 views

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, ...
Curious About Chemistry's user avatar
0 votes
2 answers
116 views

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 ...
Mäßige's user avatar
  • 257
0 votes
1 answer
121 views

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 ...
The Entity's user avatar
0 votes
2 answers
143 views

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 ...
c.leblanc's user avatar
  • 127
1 vote
2 answers
412 views

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 ...
chem_student's user avatar
0 votes
0 answers
321 views

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?
Arbor Chetia's user avatar
1 vote
0 answers
88 views

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 ...
datenheim's user avatar
  • 192
1 vote
1 answer
70 views

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 ...
Porter Garst's user avatar

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