Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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Why dosen't water vapour show equal electrolysing capacity as compared to water?

Since water acts as a strong electrolyte having high dielectric constant then similarly why dosen't water vapour show equal electrolysing capacity.Is it because of relatively weaker bonding??
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1answer
47 views

if I have concentrated acetic acid (99%) what are the out put gases during electrolysis?

If I use concentrated acetic acid (glacial acetic acid($\ce{CH3COOH}$)) as an electrolyte. What ions are produced at the anode and cathode? Can I get ethanol with it ($\ce{C2H6O}$)? If not, what would ...
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1answer
32 views

What is the effect of putting salt on water during electrolysis [closed]

I want to decompose $\ce{H}$ ion and $\ce{O}$ ion by putting carbon electrode in the water, but it look so slow. What if I put sodium chloride? Would putting $\ce{NaCl}$ have effect on output gas($\ce{...
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1answer
53 views

Electrolysis with baking soda solution, a penny as the cathode and graphite for the anode

I set up an electrolysis experiment to show my kids and wanted to explain to them what is happening. My setup has a penny as the anode and graphite for the cathode. The solution is water with baking ...
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22 views

Preparing Hypochlorous acid from salt water

I am a school student and I want help with a project My aim: Preparing Hypochlorous Acid (Suitable for sanitation). I searched across the internet and found an article at https://www.hypochlorousacid....
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1answer
66 views

Is the rate of electrolysis the same throughout as long as voltage is same

In an electrolytic cell, where the electrolysis of dilute sulfuric acid is taking place, would the rate of electrolysis be constant always, even at the beginning? By rate of electrolysis, I mean the ...
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2answers
96 views

How does overvoltage affect the products of electrolysis?

When you electrolyse an aqueous solution of $\ce{NaCl},$ the product formed at cathode is $\ce{H2}$ gas (preferential discharging), but the product formed at anode is $\ce{Cl2}$ gas. According to ...
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0answers
21 views

What is the relationship between current flow and low AC voltages within electrolyte solutions

I have recently been trying to find references or textbooks which may explain the principles of electrical current conductance within an electrolyte solution when low AC voltages are induced. Does ...
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26 views

Safe disposal of electrolytic solutions [closed]

I am planning on doing some rust removal by means of electrolysis and I was wondering how safe are the remaining byproducts. Mainly, what are the implications of using NaCl, NaHCO3, Na2CO3 and CH3COOH ...
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45 views

Sodium metal from electrolysis of molten sodium bisulfate?

My question is relatively straightforward. Can sodium metal be extracted from molten sodium bisulfate via electrolysis? I have done it before with molten sodium hydroxide, but there is such a small ...
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1answer
44 views

Electrolysis using electrodes of metals whose ions are in solution

So when we perform electrolysis of say an aqueous solution of silver nitrate with silver electrodes, silver ions having a greater reduction potential than water, accepts electrons and deposits at the ...
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4answers
10k views

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 ...
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1answer
60 views

Electrolysis of aqueous solutions

Water competes with any ions in solution for both oxidation and reduction. There are $1000\ \mathrm{g\ l^{-1}}/18\ \mathrm{g\ mol^{-1}}\approx55.56\ \mathrm{mol\ l^{-1}}$. That is truly huge in ...
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1answer
28 views

Metal deposition on passing electricity [closed]

A question asks about the results on electrolysis involving metals, and the answer says that Mg and Al would be deposited on the cathode. Aren't their reduction potentials lower than that of water? ...
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1answer
72 views

Products of electrolysis of Ni(NO3)2

During the electrolysis of $\ce{Ni(NO3)2}$ using nickel electrodes, it's said that the molarity of the solution remains constant as nickel's active, and dissolves and deposits in equal measure. But ...
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3answers
1k views

How does electrolytic conduction depends on the size of ions & their solvation?

The textbook says, The smaller the effective size of the ion after solvation, the greater will be its conducting power." But, on the Internet, it is explained as follows: Radius decreases, ...
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1answer
61 views

What is the number of electrons being transferred in electrolysis of aluminum oxide? [closed]

$$\ce{ 2/3 Al2O3 -> 4/3 Al +O2}$$ As we know, to find the Gibbs free energy, we need to use this formula: $$ G= -nFE^\circ$$ What would $n$ be in this case? After breaking it down into the half ...
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18k views

Electrolysis of aqueous copper (II) nitrate

There are two copper blocks sitting in the $\ce{Cu(NO3)2 (aq)}$ solution, a battery is attached onto both of them, providing enough energy to start the reaction. Since solid pieces of copper are ...
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1answer
92 views

Why does Hg form amalgam in electrolysis?

In a class of electrolysis, my instructor told me that Hg forms Na-Hg in the electrolysis of dilute NaCl aqueous solution. For this reason, sodium cations are reduced in the cathode instead of ...
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1answer
35 views

How does the charge imbalance affect the cell reaction when there is no salt bridge in a galvanic cell?

As mentioned in the answers to this question Why is it important to use a salt bridge in a voltaic cell? Can a wire be used? a salt bridge is used to keep the two half cells neutral. i understand how ...
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1answer
45 views

Rusting of iron is quicker in saline water than in ordinary water [duplicate]

I feel so because, saline water has more more electrons and because of that there will be oxidation will take place faster and hence the overall process will speed up. Is this explanation good enough ...
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7answers
14k views

Does NaOH react with K to form NaOK or KOH?

I realized that the $\ce{-OH}$ group when it reacts with some metal like $\ce{Na}$ or $\ce{K}$ will replace the $\ce{H}$ element to form $\ce{-OK}$ or $\ce{-ONa}$: \begin{align} \ce{H2O + Na &...
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1answer
53 views

What is the safe level of energy output for hydrogen combustion at home?

With confinement, my son would like to do some home experiments for a class. So far, he has a good setup that seems sound for the electrolysis of water. A later part of the experiment would combine ...
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1answer
175 views

Electrolytic Refining of Silver Nitrate

I read that the electrolytic refining of Silver is done using dilute silver nitrate as an electrolyte and a small percentage of free $\ce{HNO3}$. The following reactions are possible at the anode: $$\...
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1answer
34 views

How does electrolytic conductance depend on solvation?

My textbook says: If the ions are strongly solvated their effective size will increase and hence their conductance will decrease P.s after reading my textbook, I don't think I'm sure what solvation ...
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2answers
1k views

Nernst equation for a fuel cell when gases are stored separately

I have run some tests with a PEM fuel cell and the voltage we have found was $1.44\ \mathrm{V}$. Given that the standard potential for a fuel cell is $1.229\ \mathrm{V}$ what is causing the difference ...
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1answer
78 views

What is the state of aggregation of iodine formed during electrolysis of molten nickel(II) iodide? [closed]

Assume the electrolysis of molten $\ce{NiI2(l)}$ (inert electrodes) in a cell. The cell with a heating element is in the room; the room is at $\pu{25 °C}$ and $\pu{101.3 kPa}.$ The half-reaction for ...
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2answers
61 views

What are possible anode materials for copper(II) sulfate electrolysis?

I'm a student doing a research paper about copper sulfate electrolysis with an experiment by varying anode material, and aside from Pb and graphite (and pure Ti which I think wouldn't work without ...
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1answer
53 views

Contradictory Properties of Mercuric Cyanide [closed]

It is said that mercuric cyanide [$\ce{Hg(CN)_2}$] is water soluble and also is a non-electrolyte. How is this possible?
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1answer
213 views

Why does magnesium deposit during electrolysis of a molten mixture of MgI2 and AlBr3?

During the electrolysis of mixed salts, I read, and was taught, that the cation with a higher ionization energy would deposit at the cathode. I was also told that you cannot use the standard electrode ...
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3answers
997 views

Can electrodes be made from mercury?

'Mercury' was included in one of the possible answers for this exam question: Name a metal that an inert electrode could be made from: My answer was 'platinum' which was also a possible answer, ...
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Orange flakes forming after salt water electrolysis with rusty iron electrodes

I am using two old iron bars, rusty from the years, into a solution of tap water saturated with NaCl. After a few minutes at 32.6V and between 1 and 2 Ampere, I get a clear looking yellowish solution,...
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1answer
28 views

why disproportionation of free radicals does not happen in kolbe's electrolysis if we use secondary or tertiary carboxylic salt as substrate?

In notes given by chemistry teacher, for secondary carboxylic salts the final products are alkane and ester. but i guess, as the reaction intermediates involve secondary/tertiary free radicals, some ...
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1answer
48 views

Why can't two 3° free radicals combine?

In Kolbe Electrolysis, my teacher told that when a 1° or 2° free radical is used, we get alkanes through dimerisation. Why wont dimerisation occur for a 3° one??
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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 +...
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2answers
3k views

Possible methods for copper (II) reduction to copper (I)

How can I make $\ce{Cu2O}$ from copper? I am seeing if electrolysis is a good route (in the context of kitchen style chemistry) to cuprous oxide, instead of the traditional heating copper and ...
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1answer
58 views

Why does molar conductivity depend on the volume of the solution? [closed]

I have been searching the answer to this question everywhere and (almost) the only answer I get is to formula based: ‘Since molar conductivity = k / M = k/1/V for one mole = kV Therefore molar ...
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1answer
157 views

NaCl water electrolysis without membrane, how measure the free chlorine concentration?

I'm trying to made electrolysis using water and NaCl. I need at the end a concentration of 2 g/l. How can I measure the free/active chlorine? Do you know a way to "measure" the chlorine during the ...
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2answers
162 views

Production of hypoclorous acid by salt water electrolysis: requesting tips [closed]

I wish to use commonly available perfume ultrasonic nebulizers/diffusers to "fog" my working environment with hypoclorous acid, to obtain full coverage (ish) disinfection, albeit slowly. I also wish ...
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4answers
408 views

In NaCl electrolysis, why does chlorine ion get oxidized but not oxygen ion? [closed]

In $\ce{NaCl}$ electrolysis, on the positive electrode (aka. on the electrode where oxidation happens), $\ce{Cl-}$ ions were oxidized to $\ce{Cl2}$. But we don't see any $\ce{O^2-}$ at all. My pre-...
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1answer
23k views

Salt concentration and electrical permittivity of water

We know that the electric flux density $D$ can be related to electric field intensity $E$ as $$D = \epsilon(\omega) E$$ where $$\epsilon(\omega) = \epsilon_0 \epsilon_r(\omega)$$ and $\epsilon_0$ ...
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1answer
4k views

Copper chloride color in electrolysis of salty water

I tried a simple water electrolysis experiment at home, with $\ce{NaCl}$ as electrolyte, and a $12 \,\rm{V}$ battery. My wires were made of copper and $\ce{H2}$ bubbles were only forming at negative ...
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1answer
64 views

What is the substance turning salty water green when electrolysed? [duplicate]

I am a student and I take O.L. Chemistry, in my knowledge I know if I electrolysed concentrated aqueous NaCl solution I should get Hydrogen evolved at the cathode and chlorine at the anode. I did an ...
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1answer
751 views

What is the greenish substance formed after the electrolysis of two graphite electrodes in a sodium sulphate solution?

Today at school we tried the electrolysis with two graphite electrodes in a sodium sulphate solution. We put the electrodes in two test tubes and filled them with some more sodium sulphate so that the ...
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2answers
29 views

How fast will oxygen be produced through electrolysis with a 9V battery? [closed]

What kind of rate of oxygen production could be achieved with a simple 9V electrolysis setup using water?
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49 views

Are the reactions in a simple cell overall exothermic? Why?

For context, I'm in high school. I'm trying to mentally connect electrolysis with the concept of energy changes and kinda having trouble. I understand the bottom line is that a simple cell converts ...
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2answers
107 views

In a half cell reaction, Is the potential halfed?

If you have an electrolyte of $\ce{Zn^2+}$ and $\ce{SO4^2-}$ (Neutral) Then you dip in it a Zinc electrode. Zinc potential is $\pu{-0.74 V}$ (relative to SHE). So that means there is a $\pu{-0.74V}$ ...
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0answers
28 views

Can the ion that isn't preferentially discharged discharge at the same time during electrolysis?

I would like to ask if the ion that isn't preferentially discharged can discharge at the same time during electrolysis. Also, is the ion discharged at a much smaller extent or just discharged right ...
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0answers
67 views

Possible side reactions in electrolysis of concentrated NaCl

This is a very basic question about which side reactions can take place if the electrodes are not shielded from each other during electrolysis of concentrated $\ce{NaCl}$. So, this is the desired net ...
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2answers
151 views

How does polarity of a solvent increase conductance of electrolyte?

My textbook says that electrolyte ionize more in polar solvents and greater is the polarity, larger is the conductance. But if polar solvents (lets take water) causes the formation of shells around ...

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