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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Voltage required for electrolysis of molten Cu2O feedstock

Would someone mind clarifying the overpotential voltage required for molten Cu2O. Looking at Redox charts all Oxygen reactions use hydrogen or other atoms or molecules. The goal is to calculate the ...
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Artificial photosynthesis

Is it possible to transform CO2 into glucose (C6H12O6) like photosynthesis but with electricity instead of sunlight? The equation of photosynthesis is $$\ce{6CO2} + \ce{6H20} → \ce{C6H12O6} + \ce{6O2}$...
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Table of viscosity of water vs temperature

Above is the table for water physical properties table with temperature related with a,v,b,Pr,Ra factor. This table has temperature only from 0 to 100. May I ask if there is a full table for this with ...
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How are membranes for Polymer electrolyte membrane electrolysis produced?

Polymer electrolyte membrane electrolysis is a process used for creating hydrogen with a thin metal membrane. This membrane is often includes a thin metal sheet of Platinum. My question is, how these ...
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Gaseous reactant in Nernst equation

So I have this equation of a galvanic cell $\ce{Zn + Cl2 -> Zn^{2+} + 2Cl^-}$ Why does the Nernst equation not consider pressure of $\ce{Cl2}$ here? Only concentrations of zinc and chloride ions ...
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Does using stainless steel for electrolysis really produce hexavalent chromium (I'm making hydrogen gas) [closed]

I am trying to produce hydrogen gas, and I will be using high voltage DC electricity and epsom salt (magnesium sulfate) for electrolysis of water. Does stainless steel produce hexavalent chromium if ...
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What metals are safe to use as electrodes when doing electrolysis of water (I am trying to produce hydrogen gas)

I am going to be a DC power converter (with fairly high voltage and amps) to turn water into hydrogen (and oxygen) gases. However I have a few questions about the safety of this process. What ...
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Can sodium sulfate be used in the salt bridge?

My book mentions sodium sulfate ($\ce{Na2SO4}$) as an electrolyte that can be used in a salt bridge. I'm asking this question because ChemLibreTexts says that It is also important that the charge ...
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Is H2 gas produced when a mercury electrode is used as cathode in the electrolysis of Brine?

If platinum electrodes are used as electrodes, H2 gas and Cl2 gas are produced at the anode and cathode respectively. However, if a mercury electrode is used as the cathode, an exception is seen. ...
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What will happen if the electrolysis of Brine takes place for a long time?

This is the reaction: $$\ce{2NaCl(aq) + 2H2O(l) -> 2NaOH(aq) + H2(g) + Cl2(g)}$$ If the above reaction goes on for long enough, we will eventually run out of Cl- ions. There will only remain an ...
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In a electrochemical cell, why does the anode (where oxidation occurs) have a lower concentration than the cathode?

I know that under standard conditions, the concentration in each half-cell is 1.0 M. However when the cell is not under standard conditions, let's say solution A is 0.1 M and solution B is 1 M. ...
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Intuitive explanation for EMF of cell being zero at equilibrium?

I am not able to understand why $E_{cell=0}$. I went through this answer of the site Electrode Potential at Equilibrium It says This eventually comes to a stop when the equilibrium is reached. That ...
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Electrode potential for saturated silver carbonate solution

An electrochemical cell is set up to measure the electrode potential $E(\ce{Ag^+}/\ce{Ag})$ using the saturated $\ce{Ag2CO3(aq)}$ solution $(K_\mathrm{sp}(\ce{Ag2CO3(aq)},\pu{25 °C}) = \pu{6.3E-12})$ ...
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Relationship between cell potential and applied potential in electrolysis

My question is about this problem, and I got the correct answer (which is 495g), but I am confused about the concept behind the correct approach: "Calcium metal is obtained by the direct ...
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How to use a Nafion sheet Proton Exchange Membrane PEM

I am trying to use a Nafion PEM in a fuel cell configuration. Previously, I was taught to drop a little bit of Nafion solution on the membrane and heat press it between the electrodes. Why do we need ...
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Why electrolytic conduction increases with increase in temperature?

I came to know that electrolytic conduction increases with increase in temperature whereas metallic conduction decreases. But if increase in temperature increases the random motion of the ions then ...
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Why does Ecell change with concentration but not with coefficients

I understand that the voltage difference is an intensive property, which does not depend on the number of moles. So the reduction potentials don't change when you multiply coefficients by a common ...
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Question on reaction of copper(II) sulphate in chemical cell

There are two beakers of solutions connected to from a chemical cell, one of which has two metal electrodes,P and Q, with dilute sulphuric acid, while the other one has carbon electrodes,R and S, with ...
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Why did my nickel + hydrogen peroxide turn red?

So I recently thought of doing some electroplating and bought some nickel strips from Amazon. As I was making the acetate solution I added some hydrogen peroxide (6%) because I wanted to see if nickel ...
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Does the length of a salt bridge effect the voltage of a voltaic cell?

I am doing a Chemistry Lab in which it is completely student run. In this experiment, I basically set out the same exact voltaic cell, and used varying lengths of salt bridges as my independent ...
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Electrodeposition of aluminum

I wanted to electroplate aluminum onto a 3D printed part (treated with conductive paint). I found out that you can plate it with copper, zinc, gold or palladium from an aqueous solution, but ...
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Anodic stripping voltammetry linear sweep rate?

I am using an PSoCStat potentiostat to measure Pb, with a Pt counter electrode, a pencil lead working electrode and an Ag/AgCl reference electrode. This device doesn't not support Square Wave ...
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Products formed on the reduction of KMnO4 in aqueous solution

The Latimer diagram for $\ce{MnO^-_4}$ is given below: $$ \ce{MnO^{-}_4 ->[0.56V] MnO^{2-}_4 ->[2.26V] MnO_2 ->[0.95V] Mn^{3+} ->[1.51V] Mn^{2+} ->[-1.18V] Mn}$$ Then I have calculated ...
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Is there a recommended frequency when driving an alkaline water electrolyzer?

We are designing a small electrolyzer (about 1 kW input power) for HHO gas generation. Sadly most of the literature online is bordering on the snake oil… However, it works fine with DC driving. Now ...
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Ecell value for non spontaneous reaction

I've done my electroplating experiment but got stuck to calculate my E cell value. So my equations are like these coz I used copper stripes and copper sulphate solution. Some website says E cell can'...
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1 vote
1 answer
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Electrochemistry: Conductivity Vs Molar Conductivity

Why does the molar conductivity (Λₘ) of an electrolyte increase while its conductivity (κ) decrease with a decrease in concentration (or with an increase in dilution)? It's really counterintuitive. ...
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Products formed on the electrolysis of wet HF

We know that, electroysis of water produces $\ce{O2}$ at anode and $\ce{H2}$ at cathode. In a similar way I thought that on electroysis of $\ce{HF}$ it would produce $\ce{F2}$ and $\ce{H2}$ at their ...
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Methanol fuel cell anode - why not oxygen instead of water?

The methanol fuel cell: \begin{align} \text{Overall}&:& \ce{CH3OH + 3/2 O2 &-> 2H2O + CO2}\\ \text{Cathode}&:& \ce{O2 + 4H^+ + 4e^- &-> 2H2O}\\ \text{Anode} &:& \...
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Understanding the concept of voltage in electrode reactions

Background: I'm currently reading "Electrochemical methods: fundamentals and applications," by Allen J. Bard. In chapter 1, he has the following setup: He then states that we incorporate ...
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2 answers
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Why aren't electrolytic cells usually separated?

Galvanic cells need to be separated so that electrons will be forced to move through the external circuit, but I was wondering why electrolytic cells are usually not kept separated but rather as a ...
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1 answer
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Cannizzaro reaction via electrolysis

As cannizzaro reaction reaction is a redox reaction carried by adding base to an aldehyde, is it possible to carry out the reaction using electrolysis where graphite anode and copper cathode is used. ...
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1 vote
1 answer
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Why do I measure some remaining voltage after disconnecting an electrolyte from a voltage source?

I'm not at all an expert in electrochemistry and want just understand a little what is going on: I have a NaCl solution in water, connected most simply by plain copper conductors. My observation is: ...
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Is the maximum work done by voltaic cell per mole of reaction? [duplicate]

From the equation $w_{elec,rev}=-nF\Delta E$, and n = the number of moles of electrons transferred in the overall redox reaction, does that make the work per mole of the redox reaction? I am confused ...
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3 votes
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Permitted composition of lithium oxometallate in lithium-ion battery and its influence on ion transfer

The following scheme describes the overall reaction that takes place in a Li-ion battery: $$ \begin{align} \ce{Li_{$y$}C6 &-> $y$ Li+ + $y$ e- + C6} &\quad &\text{(anode)} \tag{R1}\\ \...
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1 answer
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What would happen to the cell potential if two half cells of a galvanic cell were at different temperatures?

I'm doing an experiment where I'm investigating the effect of temperature of the galvanic cell on the cell potential. But during the experiment, I noticed that the two half cells were at different ...
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Molar conductivity

Among $\ce{H+, Li+, K+, Rb+, Cs+}$ in an aqueous medium at infinite dilution at 25 °C, which ions have more ionic molar conductivities than that of $\ce{Na+}$? I know that Molar conductivity is ...
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Simple bistable and reversible electrochromic reaction in solution

I'm not a chemist and I'm looking for a simple bistable and reversible electrochemical reaction that changes color, specifically: A liquid in a glass with two electrodes that when a voltage is ...
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Why is the anode in a galvanic cell negative, rather than positive? [duplicate]

I realise there are many questions and answers on this topic, but none has answered my question. Why is the anode in a Galvanic cell negative? It makes more sense if it were positive because it is the ...
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For Radiochemistry why is a recovery range of 30-110% acceptable for isotopic tracers used for alpha spectrometry analysis of radionuclides?

Just like the title says. I am right now isolating and concentrating several radionuclides from environmental samples using micro-coprecipitation to be able to analyze it on an a alpha spectrometer. ...
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1 vote
1 answer
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In electrolysis, can conductivity be used to predict current?

Since conductivity is the reciprocal of resistivity, it can be used to calculate resistance in the following equation: $$R=\frac{\rho l}{A}$$ $$R=\frac{l}{\kappa A}$$ Could this, along with Ohm's Law ...
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1 answer
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Electrolysis in conductivity cell while measuring the conductance? [closed]

My textbook says we could measure the conductance of an electrolyte by passing an AC current through a conductivity cell and wheatstone bridge's balance.But will it not electrolysis the solution which ...
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2 votes
1 answer
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Faradic and non-Faradic current in Voltammetry

Below is a schematic drawing for a three-electrode cell used for cyclic voltammetry: Image modified from Wikipedia Voltammetry This is what I understand with the voltammetry working principle from ...
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What is 'pretreated carbon cloth substrate'?

I was reading this paper and found the following part of the working-electrode fabrication step: To prepare the working electrode, 4.0 mg of the catalyst or $\ce{IrO2}$ was dissolved in a mixed ...
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Would the Daniel cell work just as well if a solution of zinc ions wasn't used?

I know that, in a Daniell cell, the zinc anode is immersed in a solution of zinc ions. As I see it, though, these ions are irrelevant to the reaction taking place. Would the cell work just as well if ...
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6 votes
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What is an efficient way to generate CO2 electrochemically?

I would like to build a small carbon dioxide generator for experimental purposes. There are two requirements that are set in stone: It has to be electrochemical. (Easy to switch on/off with ...
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3 votes
1 answer
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Alumina solubility in cryolite (Hall-Heroult process)

For the Hall-Héroult process, the solubility of alumina in flux seems to be important. But why should I care about the persence of alumina in the bath? I can use feeder to keep the concentration ...
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Confused about concentration & temperature vs voltage of a Daniell cell

I am doing a lab that looks at how the temperature of each half cell in a $\ce{ Zn_{(s)} / Zn^{2+}_{(aq)} || Cu^{2+}_{(aq)} / Cu_{(s)} }$ cell affects the potential difference across the Cu-Zn ...
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-3 votes
1 answer
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Voltaic cell equilibrium confusion

In a voltaic cell, taking one with $\ce{Zn}$ and $\ce{Cu }$ electrodes for an example, an EMF is formed because the equilibria at the $\ce{Zn}$ electrode is shifted more towards the $\ce{Zn^2+ + 2e-}$ ...
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Why does current flow in an electrolytic cell?

Many explanations of current flow in electrolytic cells will state that electrons flow from the external power source into the cell (via the cathode). But surely this current flow would stop if there ...
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Incompatibility of Helmholtz Double Layer and Redox electrochemistry

In an electric double layer capacitor(EDLC) (or any situation with a Helmholtz double layer) what prevents the ions from being reduced or oxidized like the ions in an electrochemical cell? If it is ...
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