Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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1answer
123 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
24 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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Weights of reactants [closed]

So I was wondering what happens to the weight of a cadmium plate if it reacts with let's say three different solutions. The first solution a solution of Silver Sulfide the second a sulphate of ...
3
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1answer
46 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 ...
0
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1answer
67 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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1answer
52 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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27 views

Conditions for ranking of negative ion discharge order [closed]

My teacher told us about the negative ion discharge order $$\ce{SO4^2-} < \ce{NO3-} < \ce{OH-} < \ce{Cl-} < \ce{Br-} < \ce{I-}$$ in the sense which ion would discharge to electrodes ...
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1answer
35 views

The electrolysis of tap water [closed]

If there is one question that I have about electrolysis, it is "what would the products of the electrolysis of common tap water". I know that the electrolysis of Distilled/De-ionized water produces H$...
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3answers
959 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, ...
2
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0answers
66 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 ...
3
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0answers
21 views

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
23 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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0answers
27 views

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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1answer
44 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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1answer
39 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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2answers
72 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 ...
2
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4answers
369 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-...
0
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1answer
62 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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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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0answers
29 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
59 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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0answers
27 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 ...
2
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0answers
57 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
70 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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0answers
22 views

Electrolysis of concentrated sodium chloride solution using A.C. power supply

I heard that A.C current is never used for electrolysis as the polarity of the electrodes keep changing and this can result in explosive reactions. However, why can't we use this to our advantage? ...
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1answer
38 views

How ro interpret the given cell representation? [closed]

I have encountered cell emf having a reactant and product in the subscript. But this is the first timeI have witnessed 3 elements/compounds/ ions. How do i interpret this and what would be the ...
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32 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 ...
1
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1answer
54 views

Is this galvanic cell representation right?

Question 13. In the galvanic cell: $$\ce{Pt(s) | I2(g) | I-(aq) || Fe^3+(aq) | Fe^2+(aq) | Pt(s)}$$ Representation of anode is incorrect and cell will not work. $[\ce{Fe^3+}] = [\ce{...
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1answer
40 views

Which will be oxidised between water and Copper?

I have always read that the one having higher discharge potential undergoes the reaction( oxidation or reduction). But In this example why is there also oxidation of water?
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2answers
60 views

What is the magnitude of the current in an electrolyte? [closed]

if a battery is connected to an electrolytic cell, what is the magnitude of the current in the electrolyte compared to the the magnitude of the current in the wire? This doesn't make sense to me ...
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2answers
47 views

Does voltage or current matter most when setting up an efficient water electrolyzer? [closed]

I am setting up a homemade water electrolyzer for producing hydrogen gas, which will solely be used by myself for experimental purposes, and have heard the wattage used has a large part to play in ...
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1answer
25 views

If all the points on my graph fit on a logarithmic and polynomial trend line, how do i justify which trend line i should use? [closed]

My graph is mass of deposit vs concentration. The mass of deposit increases with concentration.
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1answer
39 views

Which is a better electrolyte for electroplating copper? [closed]

I need to know which is a better electrolyte to use when electroplating copper: copper sulfate or copper nitrate?
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18 views

Can I use an electrolyte containing a different cation from the anode when doing an electroplating experiment?

For example, I want to purify copper. So the anode will be impure copper and cathode will be pure copper. However, instead of using copper sulphate/halides/nitrate solution, can I use magnesium ...
2
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3answers
82 views

Does anyone know a database that shows the effect of electrolyte concentration on the production of hydrogen gas during electrolysis of water?

I'm currently studying in the International Baccalaureate model. This high school model asks their students to do an individual work called the Internal Assessment. One of the subjects I study is ...
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1answer
17 views

Equation for Galvanization and Electrolysis of Saltwater with Copper and Zinc

I am looking for the chemical equations for both the galvanization and electrolysis of saltwater utilizing copper and zinc. The closest I have gotten was from this site: Explanation for the reactions ...
3
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1answer
57 views

How to deal with the unit “Coulomb per equivalent”? [duplicate]

In a question that I came across they defined $1\,\pu{F}$ as 96500 coulomb per equivalent. Now as far as my knowledge is concerned $1\,\pu{F} = 96500\,\pu{C/mol}$. The question involved asks to ...
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40 views

Practical considerations for electrolysis of water

I'm interested in electrolysis of water to form O$_2$ and H$_2$, as pure as possible given the constraints of a "household chemical" setup. I've read other questions on here (in particular, Best ...
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1answer
46 views

galvanic cell vs electrolysis [closed]

At school(high school), to calculate the voltage needed for electrolysis, we calculate the voltage produce if the elements were in a galvanic cell, preceded by a minus. So if a galvanic cell with Cu ...
6
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3answers
675 views

How to control current and voltage in electrolysis

I am doing an experiment that aims to determine if the rate of electroplating changes with the temperature. I am using a copper rod, a solution of copper(II) ions and a neutral rod to be coated. I ...
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1answer
50 views

How the electrolyte help for oxidation and reduction process?

In a cell, There are two main parts namely : Electrode Anode Cathode Electrolyte We can take the half reaction at the Cathode. When the current flow from Anode to cathode there is a reduction ...
0
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1answer
31 views

Molten lithium carbonate conductivity

Does anyone know or could make an educated guess as to the conductivity/resistivity of molten lithium carbonate? Ideally, around 750 degrees C.
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2answers
48 views

What is electrolytic protection?

My highschool textbook tells me that sacrificial protection (more technically-cathodic protection) and electrolytic protection are different. I have searched high and low for an explanation of ...
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0answers
38 views

What is the yellow compound formed in electrolysis of brine?

Last week, I tried to conduct electrolysis of brine in my house using copper electrodes and 6V battery. After sometime, the entire solution turned orange/yellow. The yellow substance formed a kind of ...
0
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1answer
29 views

Is the thermodynamic stability against reduction/oxidation of an electrolyte dependent on the electrode material?

Consider an electrochemical cell with an inert Pt working electrode (WE) and some electrolyte that irreversibly decomposes upon oxidation. A minimum potential $E_{min}$ (vs. some reference) needs to ...
0
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1answer
52 views

Electrolysis of Baking Soda separated by semi permeable membrane

I have dissolved baking soda in battery water (de-ionized), in a glass beaker and used a food handling glove (vinyl) as a semi-permeable membrane to separate a graphite electrode from a copper ...
3
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0answers
53 views

Why does the electrical conductivity increase as the temperature decreases?

I am measuring the dependence of electrical conductivity of ( NaCl and $\ce{CH3COONa}$ solutions with concentration 9g/L) with temperature using conductivity meter. Theoretically the conductivity ...
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0answers
20 views

Black substances covering Aluminum Electrode

I have use two aluminum pieces as electrodes to electrolys salt (NaCl) water. After the experiment, I found that wherever electricity flows, the electrode will be covered in some blackish substances. ...
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0answers
28 views

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 ...
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3answers
76 views

Electrolysis of aluminum in a solution of magnesium sulfate

So I recently started looking into electrolysis to produce chemicals and I have only produced a few chemicals from it like copper hydroxide and copper sulfate. However I can’t seem to figure out what ...

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