Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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With electrolysis turning water into hydrogen and oxygen will we eventually use up all the water?

I hope no one thinks this is a stupid question. I’ve often wondered when we split the water molecule into hydrogen and oxygen and we use hydrogen or oxygen as a fuel for or other uses. If I understand ...
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Using PV = nRT to solve an electrolysis problem

Question: Two electrolytic cells are connected in series (the same current passes through each cell). One cell for the electrolysis of water produces $\pu{100 cm^3}$ of oxygen, measured at $\pu{273 K}$...
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What happens at the inert anode in an electrolytic cell?

Recently I did an experiment using graphite as the anode and iron as the cathode for an electrolytic cell. I tried plating different metals such as copper, nickel, and zinc with CuSO4, NiSO4, and ...
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What happens when solution containing two or more cations are electrolysed at an excess potential?

$\pu{250 mL}$ of a waste solution obtained from the workshop of a goldsmith contains $\pu{0.1 M}$ $\ce{AgNO3}$ and $\pu{0.1 M}$ $\ce{AuCl}$. The solution was electrolyzed at $\pu{2 V}$ by passing a ...
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1answer
37 views

Why does higher temperature affect the rate of electrolysis?

I understand that more heat energy= higher rate of electrolysis, but can someone explain using higher-level terms why this occurs and if there are any theories or rules that explain this?
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calculate cell potential for the voltaic cell where its involving the two cobalt species with Copper

Calculate the cell potential for the voltaic cell that results when the following two half-cells are connected at $\pu{25 ^\circ C}$: (1) A platinum electrode inserted into a solution of $\pu{0.10 M}$ ...
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How to relate the conductance of an aqueous electrolyte to its conductivity

In this answer on Physics Stack Exchange, the author states that conductance $G$ is related to conductivity $\sigma$ by $$G = \sigma\frac{A}{l}$$ where $A$ is the cross-sectional area perpendicular to ...
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Butler Volmer Electrochemistry question? [closed]

In Butler-Volmer during discharge (spontaneous reaction) we know the reaction rate (I/nF) is exponentially related to the Temperature just like in the Arrhenius equation with an increase in ...
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Alternatives to Bayer process for extracting aluminum from lunar regolith

I am exploring ways to produce metallic aluminum from lunar regolith. According to most published results of lunar soil, $\ce{ Al2O3}$ comprises roughly 14% of mare samples by mass with $\ce{SiO2}$ ...
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Why does Distilled Water (H20) dissassociates or decomposes only weakly in hydrogen and hydroxyl ions when electric current is passed through it? [duplicate]

I have read that water only decomposes weakly when current is passed through it. Caise it also has hydroxyl and hydrogen ions , why does not decomposes? Why is that it not decomposes into H positive ...
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Is possible an electrolytic cell with a rubber separator?

In an electrolysis thought I've had bouncing around in my mind I have a question. I understand the basic premise and have ran several setups already in glass jars but I was wondering if it were a ...
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How to estimate gas yield from polarization curve of the electrolyser

A good characterization of electrical properties of the alkaline water electrolysis of the water is its polarization curve. Is there a reasonable way to estimate gas yield for each point of the ...
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1answer
68 views

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 ...
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1answer
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what is volume of produced gases in water electrolysis [closed]

I decided to try and determine the combined volume of O2 and H2 that could be produced through electrolysis of water. so i looked up a bunch of stats for the relevant chemicals; H O H2O g/mol 1....
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1answer
67 views

What does the salt actually do during electrolysis?

Pure water does not conduct electricity. When you dissolve a salt like $\ce{Na2SO4}$ in water the solution becomes a better conductor. If electrolysis is done on this solution, oxygen and hydrogen ...
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2answers
64 views

Electrolysis of copper chloride in solution of Vinegar + H2O2 + NaCl after copper etching

I did copper etching (to make a PCB) using a solution of vinegar + H202 + NaCl and now I need to dispose the solution. There is no waste collection for this kind of stuff where I live, so after some ...
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2answers
63 views

Linking an electrochemical cell to an electrolytic cell

Electrolysis occurs when a non-spontaneous redox reaction occurs when electrical energy is put into it. An electrochemical cell functions by using two redox reactions to facilitate movement of ...
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A doubt in a problem on electrometallurgy

I do not understand why the number of cathodes has been considered as 30.They give an explanation that each half surface in the two extremes are to be neglected.I do not understand why should one end ...
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1answer
64 views

What happens when salt water is electrolyzed with a copper anode and a copper cathode? [closed]

I heard that copper oxide is formed on the cathode and copper chloride is formed on the anode, is this correct? I don't have much knowledge of chemistry, so I can't find out much by searching on ...
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Is it possible for graphite which has shed off metal rods during water electrolysis to bond with the hydrogen being produced to form hydrocarbons?

I recently conducted a simple experiment for school involving the electrolysis of water. I changed the concentrations of an ionic compound to determine its effect on the rate at which the products of ...
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Do ions still “conduct electricity” if a physical connection made by aqueous electrolytes between the anode and the cathode is nonexistent?

I always had the misconception that when people say ions conduct electricity, what they actually mean is a connection is made between the cathode and the anode by the ions and electrons can flow from ...
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Electrolysis with two similar metals

I've researching electrolysis recently, and all of the examples I've seen use two different metals as the cathode and anode. In my attempts to make a hydrogen producing cell (table salt used as the ...
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2answers
56 views

Can iron oxide in well-point water be removed by electrolysis? [closed]

Can iron oxide dissolved in well point water stored in a 1000l plastic tank be removed by using a 12V battery charger and simple electrodes? If so what material should the electrodes consist of?
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1answer
33 views

FFC Cambridge Process and impure reactants

The FFC Cambridge process with platinium electrodes allows the reduction of almost any metal oxide to a pure metal, with an oxygen byproduct. So far, so good. What I'm trying to understand is how it ...
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1answer
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Guidelines for home generation of hypochlorous acid disinfectant from salt water [closed]

I bought a home generator for making hypochlorous acid by electrolysis of a water and salt solution. I would like to figure out guidelines for safe and effective use of my generator. I have found ...
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1answer
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Does the volume of water involved affect rate of electrolysis?

I am working on the design for a homemade PEM electrolyzer, and my goal is to make it as compact as possible, so as to allow easy transport. My question, as it relates to that, is whether - with the ...
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1answer
49 views

Can the electrochemical stability of a aqueous KOH solution be increased by adding more KOH?

My goal is to increase the efficiency of a nickel-iron battery. One of the options to reach this goal is:suppressing the hydrogen production. Due to electrolysis, the electrolyt will start ...
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1answer
291 views

Sodium Sulfate or Sodium Carbonate for electrolysis in water

I am not a chemist but I have a question regarding electrolytes in electrolysis. I have done a lot of reading but cannot find the answer I'm looking for regarding Sodium Sulfate (or Sulfide) I intend ...
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2answers
257 views

how to separate a mixture of sodium chloride and sodium hydroxide

I recently did an double displacement reaction in that I have formed a solution of water with sodium hydroxide and sodium chloride are dissolved in it. now I want to separate both of them
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Does electrolysis of water alter the electrodes? [closed]

Today I used a 12 volt power supply to observe electrolysis of water. I mixed table salt into the water, nothing else. The leads coming from the power supply had clamps on their ends. When in water ...
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Electroplating: What exactly does an additive/ brightener do in the electrolyte?

A carrier or supressor is generally a poly-oxyalkyl compound that is instrumental in suppressing the electrolytic current. This is achieved by the formation of a diffusion layer when the additives ...
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1answer
42 views

How can I make a lot of microscopic rods of metal?

I want to make around 40-200 g of metal cylinders that would ideally have a length of around 1-100 μm in size (smaller preferred). The rods will be made of some ferromagnetic material such as Iron or ...
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What reaction would take place on an electrode in a secondary cell if it were charged and the other electrode removed?

I'm reading a book that covers the basics of electrical theory and I'm at a chapter that discusses the concept of a secondary cell. The author includes the redox reactions that take place in a primary ...
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2answers
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Anode and cathode in electrolysis [closed]

Can the anode and cathode in electrolysis be the same material and still separate out the oxygen and the hydrogen? I could not find any information about if platinum makes a good cathode or anode, ...
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2answers
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Easiest/Fastest way to obtain a good quantity of fine Iron powder? [closed]

I am wanting to make a reasonable quantity (10-100g) of iron powder that I can use to visualise magnetic fields (by putting the powder in a thin layer between two transparent materials). The finer the ...
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2answers
138 views

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 ...
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1answer
95 views

Graphene in Lithium-ions batteries: why?

I have recently been reading about the amazing discovery of a super-material: Graphene. This one carbon-layer chemical is not only one of the most resistant materials ever known, but also one of the ...
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1answer
288 views

How does liquid gallium interact with a gold leaf

I would like to know what happens when gold leaf comes into contact with liquid gallium. Will the gold dissolve into (alloy with) the gallium, wet the gallium or have no reaction with gallium? The ...
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Methane Sensor electrochemical reaction

When using a methane sensor a voltage is applied and much like electrolysis if the voltage is above the decomposition potential a reaction happens. Flammable gasses like methane are easily oxidized ...
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1answer
57 views

Differences in using molten NaCl compared to aq. NaCl in a galvanic cell having copper anode and cathode

Since we know that copper anode will release $\ce{Cu^2+}$ ion, so I was wondering whether the cathode will thicken as copper has a lower position on the electrochemical series. Based on my research, I ...
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1answer
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Why is Sodium Transported Across the Cation Exchange Membrane in the Chlor Alkali Process?

In the Chlor Alkali Process, a sodium ion is transported across a cation exchange membrane to create NaOH in the Anode Chamber: The Half reactions are: 2Cl− → Cl2 + 2e− and 2H2O + 2e− → H2 + 2OH− and ...
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181 views

Does changing the electrolyte concentration in the electrolysis of water affect the speed that hydrogen gas is produced at the cathode?

I am currently completing a Year 12 Extended Practical Investigation. Due to the lock-down restrictions we are unable to complete our own practical experiment and have been given sample answers with ...
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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 ...
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In Na extraction, is Ca2+ of CaCl2 reduced in addition to Na+ of NaCl in electrolysis

In Na extraction from $\ce{NaCl}$, $\ce{CaCl2}$ is added in electrolysis to lower the melting point of the mixture to about $\pu{750 ^\circ C}$. But doesn't $\ce{Ca^2+}$ cation compete with the $\ce{...
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1answer
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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
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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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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
201 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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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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