All Questions
Tagged with aqueous-solution electrolysis
31
questions
4
votes
1
answer
95
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 ...
- 41
3
votes
1
answer
55
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 ...
- 39
0
votes
1
answer
50
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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 ...
- 69
0
votes
2
answers
147
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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 ...
- 127
4
votes
1
answer
224
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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 ...
- 189
2
votes
0
answers
109
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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)=\...
- 121
1
vote
1
answer
168
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what happens to the electrons in low-voltage conductivity of salt water [closed]
Suppose you take a 100 millivolt voltage source, and connect it using a pair of copper wires to a bath of salt water.
A current will flow through the water. If I'm not getting things completely wrong, ...
- 27
0
votes
1
answer
93
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Hydrated electrons produced by radiation vs electrons from electrostatic charge: are they equally reactive?
One of the species generated in water or aqueous solutions by the ionizing radiations are free electrons that quickly become "hydrated" or "aqueous electrons" (see for example this ...
- 9
0
votes
0
answers
80
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Copper powder from aqueous copper sulfate solution help
I’ve been wanting to make copper powder for some homemade pyrotechnics. When placing an iron object in a copper sulfate solution, copper powder is produced. However, sooner or later, the reaction ...
- 113
2
votes
1
answer
46
views
Would ionic conduction be halted by shielding at the electrodes?
I've done this experiment myself and seen it front of my eyes. Set up a basic circuit with a battery, an LED, and connect the circuit with a salt-water solution and copper wire. The LED lights up.
If ...
- 309
1
vote
0
answers
149
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Green deposition on the anode after electrolysis of sodium bicarbonate solution in tap water
I use $\pu{12 V}$ battery with copper wires and tap water with $\ce{NaHCO3}$ dissolved in it. I connected the battery and everything went as expected but after 5 minutes bubbling stopped. I took out ...
- 35
0
votes
1
answer
466
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How does strong acids conduct electricity in water?
How do strong acids conduct electricity in water?
I have just studied ionization of water and I'm confused about some points.
First: I know that water ionizes in a very small amount ($10^{-14}$) so ...
- 29
3
votes
3
answers
3k
views
How to separate a mixture of sodium chloride and sodium hydroxide?
I recently did a double displacement reaction in which I formed a solution of water with sodium hydroxide and sodium chloride dissolved in it. Now I want to separate both of them. How can I do this?
- 39
-2
votes
1
answer
775
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Copper anode dissolves in electrolysis of copper sulfate solution [closed]
I did an experiment with copper sulfate where you place two copper rods in an aqueous solution of copper sulfate. You apply an electric current and copper metal builds up on the cathode. I noticed ...
- 113
0
votes
0
answers
99
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Generating hypochlorous acid for disinfecting water using HClO2
I use a product that contains $\pu{700 ppm}$ of $\ce{HClO}$ to disinfect water at $\pu{1 ml}$ per $\pu{1 l}$ and let it rest for about $\pu{2 hrs}$ before I use it so there is no $\ce{HClO}$ left ...
- 109
2
votes
0
answers
409
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Effect of charge density on electrolysis of dilute sulphuric acid
I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen:
$$\ce{2 HSO4- -> H2S2O8 +...
- 363
0
votes
0
answers
82
views
Measuring ions through color change during electrolysis
I have very little experience in chemistry, you might consider me a physicist, and I am mostly not even sure where to find the information I need. I will start off by describing my problem, I have a ...
2
votes
0
answers
150
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Competing half reactions in electrolysis of aqueous solution of sodium hydroxide
If you run a direct current using pure nickel electrodes through a solution of NaOH in distilled water, you will separate the water into hydrogen and oxygen.
Are there any other reactions that could ...
- 177
1
vote
1
answer
51
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Is it stupid to put used acid into a pool after cleaning the chlorinator? [closed]
I have a salt pool, and when the chlorinator salts up with calcium, I clean it with a diluted acidic solution.
What happens to the acidic solution after the reaction happens? I.e., does the pH change?...
- 209
2
votes
1
answer
3k
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Does electrolysis of aqueous tin(II) chloride produce Cl₂, SnCl₄ or both?
When applying a current to an aqueous solution of tin(II) chloride, tin crystals grow from the cathode. However, I'm not sure about the anode. It seems like there are two possible reactions:
$$\ce{2 ...
- 123
-5
votes
3
answers
2k
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 $\ce{NaCl}$ they said to melt it and then use ...
- 101
3
votes
2
answers
25k
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Electrolysis of diluted sulfuric acid
My teacher told me that electrolysis of dil. $\ce{H2SO4}$ (concentration below $50\%$) using inert electrodes results in gradual increase of the concentration of $\ce{H2SO4}$.
I can't seem to figure ...
- 141
2
votes
1
answer
1k
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Why isn't mercury electrode used to produce commercial element sodium?
I know that while electrolysing a solution of brine, if we use mercury cathode, we get sodium amalgam instead of having hydrogen gas liberated. Even the Castner-Kellner process uses this to produce ...
7
votes
3
answers
2k
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In my homemade electrolysis setup, only the negative end bubbles?
I've created an electrolysis setup by connecting a $6~\mathrm{V}$ battery to a cup filled with saline water via pencils; I am confused as to why only the negative pencil bubbles though. After running ...
- 173
-1
votes
4
answers
19k
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Why does aqueous NaCl conduct electricity?
Could someone please explain why an aqueous solution of NaCl conducts electricity? I've Googled this up but couldn't get a satisfactory answer. This has an answer on Physics.SE but that's too ...
user29731
5
votes
1
answer
235
views
Change of potential difference during electrolysis while adding salt
I was conducting a simple experiment at home on electrolysis. Obviously, when you build a circuit with a 9V battery, a lamp, and put two electrodes in water you measure a potential difference of ~9V ...
5
votes
1
answer
636
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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, ...
- 153
3
votes
0
answers
80
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 ...
- 31
2
votes
1
answer
10k
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Reaction of sulfate ion in copper sulfate electrolysis
I am planning to try copper plating a piece of metal by performing electrolysis on an aqueous solution of copper sulfate. I plan run an electrical current with the metal I want to plate as the cathode ...
- 521
4
votes
1
answer
3k
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How does KMnO₄ affect electrolysis?
I'm just blindly experimenting. I tried to dissolve some potassium permanganate in water before performing electrolysis.
I can't see much difference. How is $\ce{KMnO4}$ dissolved in water? How does ...
- 2,518