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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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70 views

Can static electricity damage solar cells?

How does static electricity damage common solar cells making them less photo reactive? At watt voltage and/or amps would change the chemistry of the common solar cell? I want to think that as long ...
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28 views

Calculate chemical potentials to find electrode Fermi level

I'm running some simple simulations of the semiconductor-electrolyte interface and I'm having a hard time figuring out the equilibrium condition. Can someone please help me with my electrochemical ...
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109 views

Does increasing the concentration of the anode electrolyte in a galvanic cell increase or decrease the voltage produced

Im in kind of a pickle here. I am using nernst equations to calculate the theoretical voltage produced for different concentrations of $\ce{Al(NO3)3}$. Reaction: $$\ce{2Al(s) + 3Pb^{2+}(aq)⟶2Al^{3+}(...
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What happens electrochemically when bird droppings corrode cars?

I think the metal of the car first goes through an acid corrosion, followed by an electrochemical corrosion. First, the uric acid in bird poop corrodes with iron: 2Fe+C5H4N4O3 -> C5N4O3Fe2+2H2. Then, ...
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90 views

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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27 views

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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27 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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24 views

Does the Nernst equation suggest voltaic cell voltage remains constant over time?

Say the following reactions are occurring in my voltaic cell: $$\ce{Mg->Mg^{2+} + 2e- +2.36V}$$ $$\ce{Cu^{2+} +2e-->Cu -0.34V}$$ Then, the Nernst equation would become: $$E_{cell}=2....
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3answers
117 views

Is it possible to generate electricity by using two inert electrodes in a galvanic cell?

The Daniell cell has two active electrodes, meaning that both the copper and the zink electrodes participate in the redox reaction. However, in a lemon battery for example, the copper electrode is ...
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64 views

What is the electrode potential at the equivalence point if concentrations of titrant and titrand are going to be zero?

Let's assume that the titrand is $\ce{Fe^2+}$ and the titrant is $\ce{Cr2O7^2-}$. Then $$E = E^\circ_\ce{Fe^{2+}/Fe^{3+}} - \frac{RT}{nF}\ln\frac{\ce{[Fe^{2+}]}}{\ce{[Fe^{3+}]}}$$ $$E = E^\circ_\ce{...
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179 views

what should be the onset potential using cyclic voltammetry?

I am working for PEM fuel cell cathode material. I am confused regarding the onset potential determination for my catalyst (CV attached, fig 1 is complete CV while fig 2 is its zoom image for clear ...
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19 views

Detection limit of selective ion electrodes

I've been studying about the selective ion electrodes and I came across a question which I seem to not be able to answer. It has to do with why the detection limit for iodide ions is lower than the ...
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26 views

Where does hydrogen evolution occur when aluminium amalgam is placed in water - aluminium or mercury?

Let's say a drop mercury is placed on clean aluminium sheet; mercury amalgam is formed. The solubility of aluminium in mercury and vise versa at room temperature is fairly low. If the entire sheet is ...
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16 views

Where to find information about galvanic deposition of various metals?

I am looking at the process to deposit Cu and Ag onto metallic surfaces using galvanic techniques. Unfortunately this works not as expected. For example I use 2 rods of Cu in a bath of CuSO4 with ...
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72 views

How does cyclic voltammetry in a electrolytic cell measure the precise oxidation potential?

From what I understand, the potential necessary to induce a current to flow in an electrolytic cell depends on both reduction potentials of the anode and cathode reactions, where E(cell) is comprised ...
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219 views

What effect does an increase in concentration of copper sulphate solution have on the rate at which copper is deposited at the cathode?

I have been studying electrolysis in school and was wondering whether a higher amount of copper sulfate solution would produce a greater mass of copper in an electrolytic cell with two copper ...
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55 views

What MnO2 and graphite do I need for making a dry cell battery?

I'm playing around with making my own dry-cell battery and I want to make sure I understand the pieces before diving into it. My plan is to make it like a layer cake: zinc sheet, paste of ...
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2k views

How does the cathode of an electrolytic cell drive the anode reaction?

Consider this electrolytic cell: In this cell, electrons from the anode of the battery travel to the cathode of the electrolytic cell, where hydrogen ions are reduced into hydrogen gas. This drives ...
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5k views

Electrolysis of concentrated sulphuric acid

In my textbook it is given that for electrolysis of dilute sulfuric acid at anode following reactions can occur: At moderate concentrations $\ce{2H2O -> O2 + H+ +4 e-}$ And for high ...
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56 views

Can the choice of which reference electrode to use in a basic solution significantly affect the results?

I am performing a combined chronoamperometry/chronopotentiometry experiment in a solution of 0.1 M NaOH and with Ag/AgCl reference electrodes. I was initially told by someone that typically Ag/AgCl ...
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26 views

Relationship between Yield and Applied Potentials

This question revolves around this question from Atkins' Chemical Principles 5th ed., Chapter 13, Question 13.116: Consider the electroplating of a metal $+1$ cation from a solution of unknown ...
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32 views

What would affect the rate of recharge of a lead-acid battery?

I am trying to perform an investigation regarding lead-acid batteries and would like to specifically look into the recharging mechanism. However, I realised that this might be quite difficult since ...
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304 views

In a galvanic cell, do the ions from half cell move into the salt bridge?

I know that ions from salt bridge move into the half cell in order to maintain electrical neutrality. But in my book it's also given that ions move from half cell into the salt bridge. For example, ...
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51 views

Mechanism of hydrogen evolution on metal-oxide electrodes

I am looking into the mechanism of different electrocatalytic reaction in acidic media on metal-oxide electrodes. Reduction of on such electrodes generally happens with the help of electrons from ...
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127 views

Cation falling off electrode after electrolysis

I'm trying to find the electrochemical equivalent for zinc in an experiment. I am carrying out electrolysis of zinc sulfate solution. According to Faraday's law, m=zq. I made a 0.1 M solution and ...
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269 views

Reduction potential of a complex

I am given the reduction potential of $\ce{Fe^{3+}}$ to $\ce{Fe^{2+}}$ as well as the dissociation constants $\ce{K_D}$ for a $\ce{Fe^{3+}}$ complex and a $\ce{Fe^{2+}}$ complex (effectively, the ...
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457 views

Rationalising the trend of standard electrode potentials between the +II and +III oxidation state of first-row transition metals

Trends in standard electrode potentials of d block elements: An examination ofthe $E^0 (\ce{M^3+}/\ce{M^2+})$ values (Table 8.2) shows the varying trends. The low value for Sc reflects the ...
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99 views

Computing i0 in the Butler-Volmer equation: How to interpret Wikipedia and Wolfram Alpha

So far, when using the Butler-Volmer equation, I had j0 given and could then just use I = A * j0 * [exp(...) - exp(...)], with <...
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39 views

Understanding Galvanic Cells

I am an electronics guy and not into chemistry so please forgive my ignorance. A Galvanic Cell is meant to act like a pump, separating positive and negative charges, and thereby creating an EMF. ...
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135 views

Problem in anode in experiment of electrolysis of brass

I am studying the electrolytic determination of copper content in brass (~58% copper, ~40% Zn and other trace elements) by using standard method BS EN 16117-1:2011. Now the electrode used for the ...
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115 views

Why does conductivity of electrolyte solutions peak at high concentrations?

I've recently done a lab about conductivity of brine over time (high concentration salt water). I passed current through salt water and measured the current over time. The graphs I got showed that ...
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61 views

capacitive contribution voltammetry

I am working with a sheet of zinc metal where there is an oxide film on it (ZnO) in passivation conditions (pH=10). I have done voltammetry measurements for different scan rates with a 3 electrodes ...
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399 views

Measurement of cell constant

Why is cell constant value measured through indirect methods (like using a solution whose conductivity is already known)? Isn't it easier to measure the length and area of cross section of a ...
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92 views

Can corrosion from hydrogen peroxide solution model the corrosion protection activities of Al coating?

Immersion in hydrogen peroxide can make steel corrode very fast. However, the coated steel resisted the corrosion attack for a span of time, and as time passes, the coating becomes thinner. Some got ...
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165 views

Aluminium etching

I'm trying to etch a very fine pitch ($\pu{0.5 mm}$) aluminium stencil for use with SMT printed circuit board making. I've done some reading on the topic and found that the safest way probably is to ...
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59 views

Corrosion issue at large DC current

I'm no expert in chemistry, but I know that corrosion can cause great problems in systems. I'm working on a prototype, and trying to figure out if corrosion will cause issues. The setup Imagine the ...
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82 views

Oxidation of zinc in NaCl solution

I'm working with a zinc sheet in water + Nacl solution, I have adjusted the pH to 10 to develop a ZnO layer and prevent all the faradaic reactions (passivation state). I've removed the oxygen with a ...
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56 views

How do I increase the amount of electrons transferred in a battery?

I made a simple battery with $\ce{Al}$ as anode electrode with $\pu{0.7 M}$ aluminum sulfate electrolyte. Platinum is my cathode electrode with $\pu{2 x 10^-4 M}$ $\ce{KOH}$ solution. I am generating $...
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274 views

How to determine the equivalence point of a titration of a mixture.

Today, I'm graphing the titration curve for a mixture, to be precise, this particular case: In order to get this done, i've been following wisely the mantra of "The strongest species (oxidizing and ...
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21 views

How can I relate the conductivity (uS/cm) at various temperatures of an aqueous solution of NaCl with ionic strength?

Can someone give the relationship between conductivity (uS/cm) with ionic strength please ? In some sources they that there is a linear relationship with a constant, but with no explanation to come up ...
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80 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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63 views

Flame color vs electrical discharge color

I don't know the right terms to frame the question but here it goes: Neon and argon give their characteristic colors when a current is passed through them at low pressure. Balmer series etc, I ...
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618 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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557 views

Why does the Oxidizing agent have to be higher than Reducing agent for a redox reaction to spontaneously occur?

On the Standard Reduction Potentials of Half-Cells table, why does the Oxidizing agent have to be higher than Reducing agent for a redox reaction to spontaneously occur?
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59 views

Alternative to OLI simulation software

I work with modeling a number of aqueous solutions, but mostly it boils down to single-component saline solutions. The industry standard for determining various saline solution quantities such as ...
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27 views

Why do we always represent only the hydrogen evolution?

In corrosion of aluminium or magnesium for example, we have the anodic reaction which is the dissolution of the metal but for the cathodic reaction we only represent the hydrogen evolution. How about ...
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51 views

Seeking an explanation of synthetic marcasite

At least one widely available commercial product is called 'synthetic marcasite,' and perhaps two or more. The most prominent is dark gray 'synthetic marcasite' for cheap jewelry. Possibly different ...
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79 views

Why the current of double layer charging is independent of potential?

i-V curve of double layer charging has a rectangular shape. Why when increasing or decreasing the voltage, the current remains constant? Or I can ask, how the double layer structure is changing by ...
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45 views

Why are there so many reactions for the discharge of LiCoO2?

I've just managed to understand a bit the meaning of having the notation of 0.5 in a molecular formula, when I found a set of multiple notations for the same discharge process that started to confuse ...
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396 views

Electrode Potential and Effect of Salt Bridge Ions on its Value

My textbook says that for a metal dipped in a solution of one of its electrolytes, the potential difference between the two at equilibrium is the electrode potential and it depends on the nature of ...