# 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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### Effect of side reactions on galvanic cell using iron rod as anode and sodium chloride as salt bridge

We just made a galvanic cell on a chemistry lesson using iron, iron sulfate , copper and copper sulfate. We used a sponge soaked in $\ce{NaCl}$ solution as the salt bridge. The issue is that we ...
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### What an electrolyte “really” does in electrolysis?

I am reading about electrolysis and I have trouble to understand why an electrolyte must be added in order for electrolysis to occur. I have read this question but still can't get it. The definition ...
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### combination of H2 and O2 after electrolysis [closed]

if we electrolysis water in a closed container H2 and O2 is formed, now as the container is closed both gases remain there when the electrolysis stop and water cool down will h2 and o2 remain in the ...
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### How to write the Nernst Equation for this reaction?

I am required to write the Nernst equation for the following reaction: $\ce{O_2 + 4H^+ + 4e^- -> 2H_2O}$ Clearly, here $\ce{O_2}$ is getting reduced from an oxidation number of zero to an ...
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### What's the error in part (b) of this question about a voltaic cell reaction? [closed]

The problem in the image was asked on a GenChem test recently. The work seems fine but the answer doesn't pass the smell test for reasonableness as it seems to be WAY too high. Where's the error? (...
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### What is the typical resistance of a piece of 1 cm^2 of carbon paper?

I have been using carbon paper (Carbon sheet 99.8% from STERM CHEMICALS) to load catalysts for fuel cell study. Just now, I realized that for a 1 cm^2 piece the resistance is about 3 ohms! Is that a ...
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### Can Tin Oxide be used as an anode in electrolysis?

Can Tin Oxide (pure or plated on graphite, etc) be used as an anode in the electrolysis of sulfate salts? like lead oxide Electrodes. I've heard that tin-graphite composites are used in lithium-ion ...
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### How are we going to handle oxygen shortage problem arising due to massive usage of current fossil fuel combustion and future Hydrogen fuel cell tech? [closed]

The current corona pandemic has created a situation where in order to save lives, there is a huge huge requirement for clinical oxygen (which is taken from the environment) all over the world. Now, ...
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### What is the reason for decomposition of layered cathode materials?

Articles like this claim oxygen can evolve from layered metal oxide cathode materials when charging the Li-ion battery. Is it the high positive potential given to the cathode while charging pulling ...
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### does a reaction happen 1 mole times before cell stops working? [closed]

I have been told delta G=nF*delta E where n moles electron have been have pushed from anode to cathode,and n is the number of electron transfer in one balanced reaction. Does this imply the reaction ...
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### What is reduction potential of Au(I)-GSH to make Au25(SG)18 clusters? [closed]

I am tryring to make Au25 glutathione clusters and was wondering what is the reduction potential for Au(I)-GSH to make Au(0) in clusters Au25(SG)18.
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### Entropy Changes in Electrolytic/Galvanic Cell?

One of the most fundamental equations in chemical thermodynamics states: $$\Delta_rH_m^⦵ = \Delta_rG_m^⦵ + T\Delta_rS_m^⦵$$ If we look at this equation in context of net chemical reaction in ...
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### Why does a potential on the reference electrode create an offset on the measure electrode of a pH probe? [closed]

I am making an analog front end for a pH probe and i encountered a design where creating an offset on the reference electrode, creates an offset on the measure electrode. How does that work ? Does the ...
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### is electrolysis of water less efficient with warm water? E.g 40, 50, 60… °C

I see there is High-temperature electrolysis which is a whole different animal than room temp electrolysis. I want to know if electrolysis of lukewarm water will behave much differently. My guess is ...
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### What does the horizontal axis on cyclic voltammograms mean?

In cyclic voltammograms (like the one in the attached image) what exactly is the horizontal axis' voltage refering to? Is it the measured voltage between the reference electrode and working electrode? ...
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### Why a Li-ion battery, when in storage, is better kept around 85% instead of 100%?

I discovered that in my laptop settings, I can select an option that is best chosen when the laptop is mainly connected to AC power, and apparently keeps the battery at a lower SOC. I found this ...
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### About the acidity of phenytoin

Can you explain why phenitoin is weak acid even though nitrogen is base? Does carbonyl group always make structure acid? If this structure doesn't have carbonyl group, would it be base not acid?
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### How to melt and roll silver chloride into sheets

I want to make silver chloride cathodes for a magnesium salt water battery. Are there any tips on how to proceed? I hope to melt the silver chloride in a covered ceramic crucible in an electric ...
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### Metal-Metal Insoluble Salt Electrode

How to derive the relation between the standard electrode potential of a metal-metal ion electrode and a metal metal-insoluble salt electrode? (Where the ion is a general ion with valency $n$, and the ...
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### concentration affect on cell potential

I conducted a galvanic cell experiment and increased the concentration of the anode (Mg) and the cathode was kept at standard conditions. I am unsure about why the cell potential decreased as the ...
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### Electrolysis in Electrophoresis of proteins and DNA

Can electrolysis happen in an electrophoresis assay (such as SDS-PAGE)? To perform electrophoresis, the substances must be dissolved in an aquatic buffer with a previously determined ionic strength. ...
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### Effect of concentration on voltage from the perspective of energy

As I understand it, the voltage in an electrochemical cell is due to the electrons transferred having a decrease in electrical energy as they go from one species to another. I assume that this change ...
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### How is Electrode Potential Developed on Inert Electrode?

How does redox couple develop its potential if electrode isn't the part of the redox system like platinum in SHE or Cl2/Cl- in water solution for example? Usually it is discussed how electrode ...
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### Vanadium redox battery… why not nitrogen redox battery OR iron redox battery?

Vanadium redox battery operating on \begin{align} \ce{V^2+ -> V^3+ +e-}\\ \ce{VO2^+ +e- +2H^+ -> VO^2+ +H2O} \end{align} because Vanadium has multiple oxidation states. How about nitrogen ...
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### Kohlrausch's Law [closed]

What is the proof of Kohlrausch's Law of Independent Migration of Ions? How did Kohlrausch calculate the limiting molar conductance of a weak electrolyte? I am asking this in context of ...
51 views