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Questions tagged [electrochemistry]

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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Electro chemistry [on hold]

Find the value of the emf of the following battery at 25 ° C, specifying the polarities of the electrodes and writing the spontaneous global reaction:
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Electrochemistr— how does decreasing molarity of one half-cell solution affect cell potential [on hold]

For my electrochemistry project I decreased the molarity of one half-cell solution (which was the cathode), how does this affect the cell potential?
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Can CO2 Be Electrochemically Reduced to Carbon Nanotubes?

Mitigation of CO2 as greenhouse gas has driven increasing investigation of its chemical reduction. The 2018 paper "Recent Progress in the Theoretical Investigation of Electrocatalytic Reduction of CO2"...
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Chemistry Olympiad Question [closed]

Can someone explain how to do this? The answer is C. I know that the direction of electron flow is from the 0.1M to 1.0M end, but I dont know how to calculate the cell potential.
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Copper voltaic cell potential [closed]

Copper electrodes are placed into two aqueous solutions of copper(II) sulfate at 25 °C. One compartment contains a 1.0 M solution while the other compartment contains a 0.10 M solution. The two ...
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14 views

Solutions when Electroplating

I'm essentially conducting an experiment to see whether using different copper-based compounds when electroplating copper onto an iron nail would give different results. So far, I've used copper ...
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26 views

How do you decide which half-equation to use? [closed]

In electrochemistry, half equations apparently do not have to be balanced when calculated E Standard Cell. But when a metal has several possible half equations, in different oxidation states, how do ...
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How to make a voltaic cell work? [closed]

i've been trying to build a voltaic pile for a better part of 2 weeks with no success. I've tried everything i can think of, but nothing seems to work. There are a couple reasons i suspect are the ...
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How to calculate the cell potential after the reaction has operated long enough for the Fe2+ to have changed by some concentration?

Consider the cell described below at $\pu{261 K}$: $$\ce{Fe | Fe^2+ (\pu{0.925 M}) || Cd^2+ (\pu{0.981 M}) | Cd}$$ Given $E^\circ_\ce{Cd^2+ -> Cd} = \pu{-0.403 V}$, $E^\circ_\ce{Fe^2+ -&...
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1answer
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Determining the reduction potential of a half cell reaction at a given pH

$E^\circ_\ce{Cu^2+|Cu} = \pu{0.34 V}$. What will be reduction potential at $\mathrm{pH} = 14$ for the same couple? Given that $K_\mathrm{sp}$ of $\ce{Cu(OH)2}$ is $10^{-19}$. My Attempt I think ...
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1answer
28 views

Cobalt electroplating over nickel-plated steel

From my research, I understand that cobalt can be used on top of a nickel layer to improve durability of the nickel plating on a steel object. I am using a nickel anode and nickel acetate as ...
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14 views

Difference between electrode potential and standard electrode potential

I was studying electrochemistry but the thing that confused me was that what is the basic difference between electrode potential and standard electrode potential?
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2answers
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No current in homemade galvanic cell

I built a galvanic cell using 0.01 M solutions of copper sulfate and zinc sulfate. I used copper and zinc electrodes and immersed them into the proper solutions (copper into copper sulfate, zinc into ...
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2answers
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Is basic solution an electrode?

Question: Calculate the potential of hydrogen electrode in contact with a solution of pH 10. My attempt: Cell reaction: $\ce{ H^+ + e^- -> \frac{1}{2}H_2 }$ I've attempted to solve this ...
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2answers
52 views

Determination of solubility equilibrium using galvanic cell reactions

This is the problem: We can determine the solubility equilibrium for silver bromide using cell: Ag (s) | AgNO3 (aq) || KBr (aq) | AgBr (s) | Ag (s) We know that: $\text{AgBr} + \text{e}^- \...
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1answer
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Measuring bioanode potential against Ag/AgCl reference electrode

I'm trying to make a bioanode for use in a microbial fuel cell. I have a piece of carbon cloth in an acetate solution with river sediment. I'd like to know the potential of the anode, so I connected ...
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1answer
29 views

When surface area of electrodes is increased, why does the current in the galvanic cell increase?

I did a lab in galvanic cells where I changed the surface area. As a result, the current increased, but I don't really understand why. I guessed it was because more are means that more ions from the ...
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1answer
46 views

How to use Kohlrausch's law with ionic equivalent conductances? [closed]

My text says that for an ionic compound like AxByif ionic equivalent conductance of Ay+ is a and that of Bx- ion is b, then the equivalent conductance for AxBy would be a/y + b/x Now my question is:...
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Why do reference electrodes have porous frits or membranes as a salt bridge?

From what I understand, they act as a salt bridge between the reference electrode electrolyte and the analyte solution (in a potentiometric titration). But why do we use partially permeable membranes ...
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1answer
33 views

How does a Pt and reference electrode measure the cell potential in a potentiometric titration?

I'm trying to perform a potentiometric titration to determine the redox potential of a $\ce{Fe^3+|Fe^2+}$ couple. To do this, I am using an $\ce{Ag|AgCl}$ electrode connected to an inert $\ce{Pt}$ ...
3
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2answers
79 views

Is it possible to build a non-degrading battery?

I am not a chemist, nor do I know anything about chemistry. What I am interested in are batteries. I don't really care about the whole "Charge in minutes, last for days" types of batteries (the ...
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0answers
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Instead of using an Ag/AgCl electrode, can I simply use another beaker and connect it to my solution via a salt bridge? [closed]

I'm trying to perform a potentiometric titration as part of my high school laboratory work, by reducing iron(III) to iron(II), and measuring the voltage change as I add cobalt(II) (to reduce it). The ...
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1answer
39 views

Why does electron flow from anode? [closed]

The above is a picture of Galvanic cell. Zinc anode is placed in Zinc sulfate solution so we have ions as Zn2+ and SO42-. On the cathode side we have the same situation we have Cu2+ and SO42-. My ...
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1answer
44 views

How does a change in the surface area of the electrodes affect the voltage produced by a galvanic cell?

I did a lab where I increased the surface area of the electrodes in a galvanic cell, that resulted in an increase in voltage. However, I have been reading and that is not supposed to happen. I am a ...
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1answer
76 views

Electrosynthesis of HCl? [closed]

I was attempting to synthesize hydrochloric acid and it seems to have formed another form of chlorinated acid. The smell is more of chlorine and is extremely powerful. I got some on my jeans and it ...
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30 views

Theoretical Calculations for Potential Generated in Salt Water Battery

I am using a $\pu{1.5 M}~\ce{KCl}$ solution as electrolyte and copper and aluminium electrodes but no salt bridge. So basically there is only one beaker with the two electrodes in it with the $\pu{1.5 ...
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Cause of imaginary part of Warburg element in EIS

In electrochemical impedance spectroscopy experiments (EIS) the diffusion of electroactive species at flat, macroscopic electrodes is commonly described by the Warburg element with the impedance ...
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0answers
36 views

Why V³⁺/V²⁺ couple has low reduction potential?

$\ce{V^2+}$ ion is more stable than $\ce{V^3+}$ because of the half-filled $\mathrm{t_{2g}}$ level. So, shouldn't the reduction potential be high?
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1answer
25 views

Which reactions occur during the oxidation and dissolution of bromide/bromine?

I'm trying to understand the fate of bromide anions during and after they undergo anodic oxidation. I have a solution of 94% DMF/6% water (by volume) with 0.1 M tetrabutylammonium bromide (TBAB) as ...
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0answers
40 views

Existence of single ion activities

I have used Davies equation to find what I believed was single ion activities and multiplied them on concentrations to define the thermodynamic dissociation constants for any kind of buffer to find ...
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0answers
37 views

Is it true that “Voigt Circuit” would be able to be fitted to various electrochemical impedance spectra?

"Voigt Circuit" which is a series combination of Voigt elements (i.e. parallel RC's), is commonly used for Kramers-Kronig relations checking; and as I imagine it is generally believed to be able to be ...
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1answer
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Do the salt bridge ions have to match the ions in the half-cells solutions?

Does the salt bridge in a galvanic cell have to have the same ions as the ones in the solutions? E.g. does it need to have nitrate ions if the half-cells contain copper nitrate and zinc nitrate, or ...
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Is there any electronic component to water conductivity?

Answers to Decrease in temperature of a aqueous salt solution decreases conductivity indicate that the electrical conductivity of salt solutions arises from the mobility of ionic species and therefore ...
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2answers
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What happens if I draw too much current from a home made battery?

If I try to make a battery like one of these: https://www.wikihow.com/Make-a-Homemade-Battery And then I short the two terminals, what will happen? Disregarding anything getting hot and burning up, I'...
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1answer
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Is the Gibbs energy of bulk metals in a Daniell cell affected by temperature? [closed]

From literature values, it is implied that the change in Gibbs energy of a Cu-Zn voltaic cell is largely due to the difference in Gibbs energy of the bulk metals (solid Cu and solid Zn). Does ...
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1answer
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Is the equation below for Gibbs energy only applicable under standard conditions?

This is quite confusing to me because it seems as if a lot of people use standard state equations and non standard state ones interchangeably: $$ΔG^\circ = -nFE^\circ$$
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Is electrolysis with AC current possible? [duplicate]

Optimizing everything else, would efficient electrolysis be possible with AC current? Most sources suggest to use DC, but can the water still be split/disassociated with AC?
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1answer
44 views

Degradation of anode in electrolysis

In my electrolysis experiment, I used a 9 volt battery, 1:100 mL baking soda:distilled water, and stainless steel electrodes. I noticed that the anode degraded faster than the cathode. Out of ...
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2answers
37 views

what is the exact meaning of oxidation state? [duplicate]

can you mention the concept of oxidation state without its simple definition i-e it is the apparent charge +ve or -ve.....😪 I found these in wikipedia but didn't understand."Conceptually, the ...
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0answers
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why do I get chlorine gas production during electroetching?

I was electroetching stainless steel plates with table salt as electrolyte and the power supply was providing 5V, 6A when I placed the anode and cathode about .25 inches apart. I started smelling a ...
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1answer
27 views

Which etching process is better, photochemical or electrochemical?

My boss and I are experimenting with several different ways to micro machine .01" and .005" stainless steel. When I look up how it's done professionally, I see an overwhelming majority of companies ...
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0answers
23 views

Changing the CO2 concentration (adding or subtracting) inside a sealed vessel?

I am looking for a method of modifying the CO2 concentration inside a sealed container that is both precise and repeatable (C02 needs adjustment every time the container is sealed, also need to be ...
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0answers
22 views

Cheaper ionic membranes

I am trying to make sodium hydroxide by electrolyzing table salt. I learned that I need cation exchange membrane (CEM) to prevent Cl- from crossing over to the cathode. The only example of CEM that I ...
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2answers
49 views

How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
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0answers
57 views

Pale blue species forming during electrolysis of NaHCO3

I have a solution of 3500 ml $\ce{H2O}$ + 454 g $\ce{NaHCO3}$ in electrolysis at a potential of 12.5V using a lead anode and copper cathode. The surface areas aren't measured but they are enormous. I ...
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0answers
35 views

Is it possible to convert a combustion reaction directly into an electrochemical one?

I'm fairly inexperienced in chemistry so forgive me if this question is silly but, why is it not possible to convert a combustion reaction to an electrochemical one directly and harvest the electrical ...
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0answers
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Electrolytic cell to remove soft solder from silver?

Hi my chemistry is pretty dire but have vague idea that an electrochemical cell could be used to remove soft solder (lead/tin probably) from a piece of sterling silver in need of a repair. The ...
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1answer
46 views

Why do power requirement figures for water electrolysis on the web seem to be wrong?

I need to calculate the power needed to electrolyse 1 mole of water for a project. We will either use Polymer Electrolyte Membrane Electrolysis or Alkaline Water Electrolysis, they operate on 1.75V-2....
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1answer
56 views

Why is concentration of nickel nitrate constant? [closed]

Consider a cell with both nickel electrodes and a solution of nickel nitrate ($\ce{Ni(NO3)2}$). Current is passed through the solution. The $ E° $ values predict that nitrate in the solution should ...
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1answer
60 views

Working principle of simple chemical cells

I have just learnt about simple chemical cells but I have no idea how to determine which cells will work and which will not and the working principle of those cells. I know that a chemical cell with $...