The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using electricity (electrolysis).

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Why is Iron (Fe) difficult to reduce?

1. Fe3+ + e- ---> Fe2+ +0.77 2. Fe3+ + 3e- ---> Fe -0.04 3. Fe2+ + 2e- ---> Fe -0.41 4. Zn2+ + 2e- ---> Zn -0.76 5. Co2+ + 2e- ---> Co -0.29 6. Ni2+ + 2e- ---> Ni -0.25 I am having a ...
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7 views

How do I use a galvanic cell to show the reactive activities of magnesium, zinc and copper?

I need to write up an experiment, to determine the relative activities of magnesium, zinc and copper, but I'm unsure of how to record my results for the experiment. Aside from seeing which metal ...
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11 views

Electrolytes and conductivity

What is the term used to describe water in relation to conductivity and ionic compounds? I don't know what the term for it is
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7 views

Where do I go to get details on setting up different instruments?

Say I want to set up a system to preform cyclic voltammetry. How do I know what instruments to get/ electrochemical cells/ etc? Is there a resource for other setups as well, like EIS?
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13 views

Purpose of electrolyte in a galvanic cell

I am confused as to why galvanic cells have electrolytes. For example, a zinc-hydrogen galvanic cell has a zinc sulfate anode electrolyte and hydrochloric acid cathode electrolyte. The overall ...
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12 views

reduction of O2-partial pressure with a H2 fuel cell: minimal pO2? enhancements?

I'm preparing a biological experiment which requires a chamber to have N2, CO2, H2, and O2 at reduced partial pressure. I intent to start with ambient air, inject H2 obtained from a H2O-electrolyzer, ...
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11 views

Calculating spontaneity of galvanic cell reaction

I was having trouble on figuring out how to calculate spontaneity of a galvanic cell with electrolytes different than the electrodes: on the anode side, you have aluminum electrode and aluminum ...
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1answer
21 views

aluminum hydroxide as an electrolyte

A friend and I recently produced some aluminum hydroxide, $\cf{Al(OH)3}$ for a project, and we wondered how it functions as an electrolyte. We know it has a low conductivity and solubility, but we ...
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9 views

Electrode in fuel cell

I have an small idea in reducing cost of fuel cell. If we use spiked carbon electrode instead of using platinum electrode in fuel cell what would happen?
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19 views

what happens when sweat reacts with copper and aluminium [on hold]

I am doing an experiment hand battery.. If we keep our hands on 2metal plates and connect both of them to a multimeter..it shows some current flow due to reactions happening between sweat and metal ...
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11 views

Ethyl Viologen electrochromic experiment

I came across this article on electrochomic displays. It mentions Ethyl Viologen as an electochromic chemical. I would like to attempt an experiment to showcase it's electrochomic properties but don't ...
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12 views

how a galvanic cell works with a different metal cation in electrolyte than used in electrode

A traditional galvanic uses zinc as the anode electrode submerged in a zinc sulfate electrolyte, and copper as the cathode electrode submerged in a a copper sulfate electrolyte. I wanted to know what ...
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22 views

An alternate purification process for sugar separation form bee honey?

Bee honey contains 75% sugars (Fructose, Glucose, Maltose, Sucrose and others), some water and low amount of different compounds (up to 5%) Wiki. Basic purification is done by addition of phosphoric ...
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2answers
52 views

Fe^+2----> Fe^+3 + 1e , for this rxn the oxidation potential which i found on internet is -0.77V. But how can it be negative?

$\ce{Fe^{2+} -> Fe^{3+} + e^-}$ , for this reaction the oxidation potential which I found on internet is $-0.77 \,\mathrm{V}$. But how can it be negative? Negative oxidation potential means ...
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9 views

If the net enthalpy of a reaction is negative, then is the product stable? [closed]

for rxn: M(s)----> M^+2(aq) + 2e ( where M is any transition metal) , we know if net enthalpy change for the whole rxn is negative then M+2 will be more stable than M(s). Net enthalpy for any rxn= ...
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33 views

Is it right to say if the net enthalpy change for the whole reaction is negative, product will be more stable? Please read the description: [closed]

for rxn: M(s)----> M+2(aq) + 2e ( where M is any transition metal) , we know if net enthalpy change for the whole rxn is negative then M+2 will be more stable than M(s). Net enthalpy for any rxn= ...
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1answer
60 views

Understanding Standard Hydrogen Electrode

I came across a question today. A galvanic cell is composed of two hydrogen electrodes, one of which is a standard one. In which of the following solutions should the other electrode be immersed ...
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1answer
17 views

How long will it take for a measurable change in mass (corrosion) in an iron copper corrosion cell to happen?

I am planning to do an experiment, in which I will test the affect of salt concentration on corrosion rate. Would there be a relationship? How long would it take for rust to form, that could be ...
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2answers
30 views

What determines the speed of charging of a battery?

I was told on physics.stackexchange that this question belongs to Chemistry, what do you think? Recently we have seen the surge of superfast mobile phone charging. Just an example: ...
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1answer
37 views

If you run an electrolytic cell long enough, does the conductivity decrease?

I've never seen this discussed so I wanted to ask here. Consider the electrolysis of water with inert electrodes and electrolytes that won't be oxidized or reduced, such as sodium sulfate. Since the ...
3
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1answer
30 views

How to measure corrosion rate of an iron nail in salt water?

I want to measure rate of corrosion of an iron nail. One way to calculate the corrosion rate is to use the weight loss of the iron nail. However rust does not come off easily. Do have any other ways I ...
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15 views

Sulfuric acid as cathode electrolyte

If the cathode half reaction contains sulfuric acid as its electrolyte and the cathode electrode is platinum, will the 2H+ ion (from the dissociate of sulfuric acid) be reduced to H2(g) since the ...
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1answer
33 views

What is the Purpose of an Electrolyte in a Galvanic Cell?

I understand how a galvanic cell works and the purpose of erverything such as the ssalt bridge and the electrodes, however I don't understand why an electrolyte is required. For example, consider this ...
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18 views

How does a cathode half reaction work with different metal electrode and electrolyte

If you had a galvanic cell with the cathode half cell using silver as its electrode and Copper Sulfate as its electrode, will the copper (s) coat the silver electrode?
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19 views

How to make a corrosion cell?

I've read that in a corrosion occurs as a result of an electrochemistry. The iron oxides and acts as an anode, while carbon (present in Iron) acts as the cathode, but it is the oxidized water that ...
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19 views

How to model a lead-acid battery without lead dioxide?

I don't have lead dioxide available to me and would like to carry out an experiment to see how the voltages changes when I change the concentration of the electrolyte. Since I can't make the lead-acid ...
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1answer
24 views

What is the correct discharge reaction in nickel-cadmium cell?

In school textbook :- $$\ce{Cd +2Ni(OH)3->CdO + 2Ni(OH)2 + H2O}$$ Wikipedia Chemwiki $$\ce{Cd +NiO2 + 2H2O->Cd(OH)2 + 2Ni(OH)2}$$ Which reaction should I follow? Any explanation is ...
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38 views

Platinum vs Silver as Electrode for carbonic acid electrolyte [duplicate]

Is silver a better cathode electrode with carbonic acid in a galvanic cell or is a platinum electrode better with carbonic acid ? The anode electrode is copper with copper sulfate electrolyte, and the ...
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2answers
59 views

What factors could lower the voltage of a galvanic cell

Recently I conducted a lab in which the voltage of a galvanic cell between two metals was recorded. Both metals were placed in an solution of their own ions with nitrate and a salt bridge was made by ...
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12 views

Oxidation of Amines to their Nitro correlate

I'm experimenting with electrochemical cells and I'm curious if it could be possible to oxidise an amine to its nitro state via electrochemical oxidation. Oxygen from where? Maybe from a slightly ...
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1answer
60 views

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, ...
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2answers
65 views

How does one determine the probability of H⁺ to H₂O in pure water?

The ratio of $\ce{H+}$ to $\ce{H2O}$ is something around $10^{-8}$. How did people determine that? You cannot use the $K_\mathrm{w}$, $\mathrm{p}\ce{H}$, $\ce{[H+]}$ ion concentration value to answer ...
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1answer
23 views

half-reaction in a battery

A half-reaction on one of the electrodes in a battery produces free electrons (for example) and consumes anions (or produces cations). I understand why, if there's an external wire for electrons to ...
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1answer
67 views

Why is the cyclic voltammetry of my ferrocene compound not showing a standard shape?

I am trying to set-up a new cyclic voltammetry measurement station in my lab but the results are very poor. I am using the following parameters: ...
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22 views

Probability of getting a shock in pure water and salt water

I know that salt water is a better conductor of electricity than pure water but can we measure or compare this quality?
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20 views

How is Gibbs-Donnan equation derived?

Could it be derived from fundamental relations of gibbsian thermodynamics and other relevant physics? Or is the equation solely representing an experimental fact that only approximates the more ...
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1answer
107 views

Electrochemistry

My book says: "At each electrode-electrolyte interface there is a tendency of metal ions from the solution to deposit on the metal electrode trying to make it positively charged. At the same ...
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23 views

Reduced Graphene Oxide (RGO) Conductivity vs Everything Else

I had a question regarding, as you can see, 'Reduced Graphene Oxide'. Not many people are aware of this material since pristine 'graphene' gets all the attention. Reduced Graphene Oxide (RGO), is the ...
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34 views

How to calculate the thickness of the double layer at an electrode

I need help calculating a double layer thickness. In this situation two insulated planar electrodes are placed in an electrolyte (in this case drinking water) and a voltage is applied to them of 10V ...
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3answers
62 views

Why is the reaction between potassium permanganate and hydrogen peroxide spontaneous?

When hydrogen peroxide is mixed with potassium permanganate, oxygen gas and water vapour are formed, according to the reaction (source): $$\ce{2MnO4- + 3H2O2 -> 2MnO2 + 2H2O + 3O2 + 2OH-}$$ This ...
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23 views

Solubility of Silver Nanoparticles

(i) What happens when you put $\ce{Ag_{10}}$ and $\ce{Ag_5}$ clusters into an aqueous solution of pH = $13$ (ii) What happens when you put $\ce{Ag_{10}}$ and $\ce{Ag_5}$ clusters into an ...
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0answers
47 views

Side products during the electrolysis of Copper Sulfate?

Using good quality reagents, during the electrolysis of $\ce{CuSO4}$ (at $\mathrm{15V ~ \& ~ 2A}$), I have noticed a significant amount of Hydrogen generated at the negative electrode in addition ...
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1answer
16 views

Why is the electrode with the lower reduction potential the cathode?

Wouldn't it make sense that the electrode with the higher reduction potential be the cathode, since reduction occurs at the cathode?
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1answer
20 views

How to ionize a liquid and apply a force using electrohydrodynamics

I would like to create a contactless force on the surface of a liquid by ionizing it and placing the container between a cathode and anode, however I'm not sure how I would go about actually ionizing ...
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1answer
23 views

Galvanic corrosion: Copper, iron and aluminum in an automotive cooling system

I am building a small copper heat exchanger I am going to plumb into my coolant system. I'm afraid that the copper will corrode my aluminum radiator or iron engine through galvanic action via the ...
4
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1answer
37 views

EMF measured while verification of Nernst equation keeps on increasing

I was doing this experiment to verify Nernst equation in my school's lab. I had two beakers one with $\ce{ZnSO4}$ and the other with $\ce{CuSO4}$ both having a concentration of $1~\mathrm{M}$. I had a ...
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1answer
32 views

Requirements for electroplating

I understand that electroplating involves using an anode (copper in this case) and an electrolytic solution containing Cu(II) ions with some sulfuric acid. Why exactly does the anode need to be copper ...
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1answer
31 views

Which half cell equation do you switch when calculating E° cell?

This is probably a super easy question but I am completely stuck. I am given the following standard potentials and I want to calculate the overall $E^\circ$ cell $\ce{Pb(SO4)_{(s)}+ 2e- → Pb_{(s)} ...
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18 views

Thermodynamics PV graph [closed]

If an ideal gas is taken from state A to state B along a straight line path in PV diagram. So the work done by the gas in the process A to B exceeds the work that would be done by it if the system ...
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1answer
50 views

Unknown white precipitate in electrolysis of water

I was electrolysing water using a copper anode and zinc cathode. The water was from the tap and where I live is very hard. I was using about 20V between the two electrodes. As I applied the ...