Questions tagged [electrolysis]

For questions about the chemical concepts of electrolysis.

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Silver Nitrate Electrolysis

i have a solution of silver nitrate at 1M. the aim of my experiment is to determine in 40 mins, how much Ag will be deposited. Should i use copper or graphite electrodes.
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Can redox reactions be reversed?

Suppose I did this reaction by dipping a $\ce{Zn}$ rod in $\ce{CuSO_4}$ solution. $\ce {CuSO4 + Zn -> ZnSO4 + Cu}$ Is there a way to reverse this reaction to $\ce{Cu + ZnSO4 -> Zn + CuSO_4}$? ...
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172 views

What can be a harmless electrolytic additive for water for creating an oxy-hydrogen flame?

I was thinking of preparing a tiny oxy-hydrogen flame for soldering. I am going to use 6V DC and aluminum sheet as the electrode for this. Now, I have to add some electrolyte to water, that can be a ...
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353 views

Why don't all electrodes produce the same results in the electrolysis of potassium iodide?

While in lab, I accidentally used two paper clips while trying to electrolyze potassium iodide and all I saw was was phenolphthalein turning pink at the cathode and no brown at the anode. I asked my ...
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201 views

Storing oxygen generated via water electrolysis

I want to create a somewhat pure oxygen gas from electrolyzing water and using sodium bicarbonate as an electrolyte. How can I harvest the oxygen once it is released from the water, and store it in a ...
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How to apply Faraday's law to calculate the charge of metal ions?

Electrolysis of a molten ionic compound with a current of $\pu{0.50 A}$ for $\pu{30 min}$ yielded $\pu{0.700 g}$ of a metallic element at the cathode. If the element has a relative atomic mass of $150....
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84 views

chemical reaction that causes electrolysis of salt water without adding electric current

I am producing hydrogen using house hold items in a capacitor like arrangement in salt water. I assume this is chemical electrolysis. The apparatus produces gas for many weeks that burns orange. Its ...
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644 views

Electrolysis of water in 0.1 M hydrochloric acid

For water electrolysis in acidic media ($\ce{TiO2}$ anode and $\ce{Pt}$ cathode) the half reactions for water splitting and $\ce{O2/H2}$ evolution are as follows: Anode: $\ce{H2O + 4 H+ -> 4 H+ + ...
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665 views

Electrolysis of water - why not pure water?

In the electrolysis of water, $\ce{H2O}$ molecules are being reduced at the cathode (forming $\ce{H2}$ and $\ce{OH-}$) and oxidized at the anode (forming $\ce{O2}$ and $\ce{H_3O+}$). It is said that: ...
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Why do we do electrolysis and electroplating using warm electrolyte?

This is a pretty basic question, and I know it has something to do with conductivity, but I'm not quite sure how they are related.
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Can “Common Ion Effect” suppress the dissociation of water molecules in acidulated water?

$$\begin{align} \ce{H2O &<=> H+ + OH-} \\ K &= \frac{[\ce{H+}][\ce{OH-}]}{[\ce{H2O}]} \\ \ce{H2SO4 &<=> 2H+ + SO4^2-} \end{align}$$ In acidulated water water dissociates into ...
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665 views

Differences between galvanic cells and Li-ion?

There are clearly some differences between the classical galvanic cell and the Li-ion batteries, but if one looks at the schematics, they looks a bit similar. Please see below: a) The galvanic cell: ...
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146 views

Unknown salt formed from electrolysis of urine

I am not sure what I was expecting to happen with this but I created a circuit to electrolyze various household liquids. My electrodes are copper — or at least claim to be, I think they might just be ...
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266 views

What does it mean “A oxidizes on B”

I have just managed to understand the difference between oxidation and reduction. So basically if A oxidises B, then B loses electrons, right? But what does this formulation mean: "A is oxidized on B"?...
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Effect of pH on electrolysis

I understand (more or less) that acidification of water helps in the dissociation of water into ions. Acids easily dissociate into ions in aqueous solution. So, accordingly, the hydrogen from the acid ...
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99 views

Why a low conductance ion such as lithium is used in batteries?

Lithium ions have a relatively low conductance (Wikipedia) so why are they used in batteries, and not sodium, potassium, etc.?
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284 views

Faraday law in electrochemistry?

Passing electricity through dilute solution of H2SO4 for a certain time period of time liberates 168 ml of gases at stp. The quantity of electric ity used is ? I used the formula W/E = IT/96500 here ...
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49 views

Magnetically separating H2 and O2 in a volume of gas [duplicate]

I'm using a method of electrolysis where the anode and cathode are in close proximity (~0.7mm) and therefore the separate collection of H2 from the cathode is very difficult. Since O2 is paramagnetic ...
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1answer
465 views

High voltage AC water electrolysis not working

I was trying to use a $500~\mathrm V$ AC power supply to split water, but nothing happened. I tested everything with a $9~\mathrm V$ battery, and it all worked fine. Why did it not work with the ...
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270 views

Electrolysis of Anhydrous Sodium Hypochlorite

Considering liquid anhydrous sodium hypochlorite: $$\ce{NaClO (l)}$$ Assuming the ions are free, What would be produced if this were electrolysed? As I've found lots of information for it's ...
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1answer
515 views

Brown particles in electrolysis of brine [duplicate]

This is not a duplicate... pls read the whole question.... I am attempting electrolysis of brine (tap water + table salt). I am using HB pencil lead (graphite) as my two electrodes. I am using 12 ...
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3answers
766 views

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 ...
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Obtaining calcium

I have an issue with a way of extracting calcium from a muscle tissue (from a steak, to be exact). I would like to calculate the concentration/amount of calcium stored in a piece of the muscle, yet I ...
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1answer
37 views

Why can't electrolysis utilize specific ions for reduction/oxidation

In the electrolysis of water, reduction half equation is $$\ce{2H2O + 2e- -> H2 + 2OH-}$$ with a standard $E$ value of $-0.83\ \mathrm V$. If $\ce{H+}$ is present in water, why can $$\ce{2H+ + 2e- ...
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Electrolysing vinegar

Yesterday I made a mixture of vinegar and salt and then electrolyzed it. I was just wondering if anyone could tell me what the process created, it would be greatly appreciated.
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653 views

Electrolysis of water with aluminum at the negative pole

I am doing electrolysis of water to collect the hydrogen and I'm running into a problem: on the positive side I'm using graphite from a pencil (I cannot use any other material because it corrodes too ...
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758 views

How do electrolytes allow electrolysis to occur?

From what I know, when two electrodes are places in a electrolyte (say $\ce{H2SO4}$, which decomposes into $\ce{H}^{+}$ and $\ce{SO4}^{2-}$ in aqueous solution), the negative ion is attracted to the ...
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147 views

Tried charging a penny/dime battery. Yellow goo bubbled. What did I create?

When I was a young child, I applied 9 volts across an electric cell I made using a penny, a dime, and a salted piece of paper napkin wet with saliva. Immediately, an unknown mustard-yellow liquid ...
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78 views

Flood Control - electrolysis - limit to rate of conversion?

Flood control - is it possible to use electrolysis to remove flood waters by converting water into oxygen and hydrogan gas? Is there a limit to the amount of water that can be converted at a time? ...
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3answers
7k 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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314 views

Concentration of electrolyte in rust removal

I will be attempting rust removal from a steel gas tank of about 5 liters by means of electrolysis, with steel wire acting as the anode. For the electrolyte I've been advised to dissolve $\ce{Na2CO3}...
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157 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 ...
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2answers
740 views

How does an anode metal come into solution if it cannot react with an electrolyte?

From what I understand, an anode material is chosen so that it does not react with the anode electrolyte solution. I was just wondering, then, that when you have a galvanic cell which has a Mg metal ...
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3k views

Production of hexavalent chromium during electrolysis using a stainless steel as the cathode

I want to do rust removal by electrolysis (sodium carbonate, water solution) Can I use a stainless steel basket as a cathode or will it produce hexavalent chromium ? I know if I use stainless steel ...
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229 views

Calculating the energy used during electrolysis of NaCl

Suppose we are getting the necessary $\ce{Na}$ for $\ce{HCl}$ out of $\ce{NaCl}$. We need to end up with $V = 100~\mathrm{m^3}$ of $\ce{HCl}$ at standard conditions. Assuming that $\ce{HCl}$ is an ...
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36 views

Calculating time needed to coat an object using the process of electrolysis

Suppose we have an object with a surface area of $S=1.5~\mathrm{dm^2}$, and we need to coat it with hard chrome. The thickness of the coat should be $d=80~\mathrm{\mu m}$. The mixture used for coating ...
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128 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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66 views

How does one optimize the molar concentration of electrolyte in terms of the rate of electrolysis?

There are many textbooks/recipes for various electrolyte solutions in the electrolysis of water. I know there is a minimum voltage to kick off electrolysis, and I'm supposing a minimum concentration ...
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438 views

Platinum Electrodes

In industry, numerous companies state that they use platinum electrodes for the purpose of electrolysis. My question is: are these electrodes pure platinum or could they also be, for example, another ...
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240 views

Silver electroplating

In most of silver electroplating (or electrorefining) methods, it is mentioned that silver anode is oxidized in aqueous solution of silver nitrate, and that silver is deposited at the cathode (...
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922 views

Calculating Electrode Potential for Electrolytic Cell at Non-Standard States

Recently, I came across an interesting question that left me rather baffled. I was asked to calculate the minimum voltage required for the electrolysis of 1.0 M of NaCl in neutral solution using the ...
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Ratio of energy required for electrolysis vs creating water

I had an idea a while back for a machine that would be totally green. Powered by a Hydrogen Fuel Cell. A big question came up: Where do I get the Hydrogen? I assumed that I could just electrolysis of ...
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4k views

Why does the concentration of hydrogen ions increase in the electrolysis of dilute sulphuric acid?

In the electrolysis of dilute sulphuric acid, I'm given these two half-equations: anode: 4OH-(aq) -> 2H2O(l) + O2(g) + 4e- cathode: 4H+(aq) + 4e- -> 2H2(g) Why does the concentration of hydrogen ...
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Why is twice as much hydrogen produced than chlorine in the electrolysis of brine?

I have seen a great many number of diagrams which show the electrolysis of brine in a diaphragm cell, but show twice the volume of hydrogen produced. For example: On the other hand, other diagrams ...
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232 views

Can you electrolyse a single H2O molecule?

I don't know why I'm asking or why you'd want to but I'm just curious. Every resource I read about electrolysis says the reaction is $\ce{2H_2O (l) \rightarrow 2H_2 (g) +O_2 (g)}$. Can you ...
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75 views

Safe silver electroplating solutions

Are there any practical, sane and safe solutions that can be used for silver elctroplating/electrolysis that are purchasable? Objective is to create silver crystals, but without having evil cyanide ...
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198 views

How do proton exchange membrane electrolysers work?

I've seen lots of videos, animations, and a few Wikipedia pages, but I'm still trying to figure out a few things. Is an electrolyte needed to make the water conductive like an alkaline electrolyser? ...
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Water side-reactions in organic electrochemistry (redux) [closed]

(note: this is a reposting of part of my original post which I was told had too many questions in one post) Please bear with me as I am a chemistry newbie, but I am autistic and have recently ...
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1answer
145 views

Orange dust floating ontop of Electrolysis solution [closed]

While I was doing an Electrolysis experiment with stain less Anode/Cathodes on aluminium plate, Orange dust started floating on top of the water solution. What is this chemical's name and is it toxic ...
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1answer
55 views

DC Cell + Copper Wire + Ground Water

DC Cell + Copper Wire + Ground Water produces bubbles from wire and water turns rust red gradually? What is happening? I can see something is settling down...