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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What can be used as an electrolyte in water to perform electrolysis other than salt?

I am looking for an electrolyte to use in water to perform electrolysis. It can't be salt, as salt ($\ce{NaCl}$) would cause the chemical reaction of $$\ce{H2O + NaCl -> Cl2 + H2 + NaOH}$$ or ...
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1answer
26 views

Plotting ΔG vs Temp for Electrochemical Reaction

I’m doing an electrochemistry lab that requires me to construct various galvanic cells in an attempt to solve for $\Delta H$, $\Delta G$, and $\Delta S$ values of an unknown. During one part of the ...
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1answer
70 views

How to determine the value for n in the Gibbs free energy and redox potential equation?

I am having a problem with this equation for redox potentials $$\Delta G=-nF\Delta E$$ In this equation I never am totally sure about what the value of $n$ should be, for example for the reaction ...
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22 views

Basis set in the computational software “Gaussian-03” for studying adsorption of a hydrogen atom on a carbon paste electrode dropcasted with Pt-CNT

What is the basis set in the computational software "Gaussian-03" that can be used to study the interaction of $\ce{H}$-atom with $\ce{Pt-CNT}$ dropcasted electrode? How can we study the energy ...
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1answer
47 views

What is the precise definition of W$_{max}$ in the context of electrochemistry and thermodynamics?

I'd like clarification of the meaning of $W_\mathrm{max}$ in the following equations (and thus in the combined result in the third equation): \begin{align} W_\mathrm{max} &= \Delta G\\ ...
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1answer
33 views

How come diluting a cell decreases the voltage?

I just want to know why, if we dilute a cell with water, it decreases the voltage. Assume it is a galvanic cell.
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1answer
67 views

Electrochemistry - Redox & Electroplating

I've stumbled across a problem that I need help on, it is mostly Electrochemistry and I will show my work. Line Notation Error: $$\ce{Fe~|~Fe^{+2}~||~Cl^{-},Cl2~|~Pt}$$ After that, I ...
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186 views

Is the 'n' in Delta G = -nFE, ever negative?

Is it possible for 'n' to ever be negative? Trying to figure out where I went wrong on some thing and want to rule that out.
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3answers
56 views

Difficulties understanding how salt bridge works

A picture for reference: Difficulty 1: I don't get why a salt bridge is needed. People say it's to maintain the overall neutrality. But in both cases where salt bridge is a tube of solution and a ...
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2answers
41 views

How can I balance the following equation atomically and electrically?

$$\ce{C2O4^2- + MnO2 -> Mn^2+ + CO2}$$ I think that the half reactions are $$\ce{C2O4^2- -> CO2}$$ $$\ce{MnO2 -> Mn^2+}$$ I am supposed to balance these by adding water, $\ce{H+}$ atoms ...
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23 views

Why some redox half-equations can be combined and some not?

I mean by "combining" making a new half equation. Not a overall equation. One that cannot be made by combining: $\ce{MnO2(s) + 4H+(aq) + 2e- -> Mn^{2+}(aq) + 2H2O(l)}\quad E^\circ= ...
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1answer
50 views

Does the relationship equation between standard cell potential and equilibrium constant violate potential's intensive properties?

The equation: $$E^{。}_{cell}= \frac{RT}{nF}\ln K_{eq}$$ We all know cell potential is intensive, not affected by the amount, Because: $volt=\frac{joule}{coulomb}$. Both joule and coulomb will be ...
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0answers
37 views

Second question about aqueous solution

I ask a question here but no one prove me the result, so I seek some others examples on the net and I found this, I precise I don’t understand them too and if someone here can prove it step by step ...
2
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1answer
35 views

Conductivity and Molar Conductivity of Equimolar Solutions of LiCl and KCl

If one took equimolar solutions of $\ce{Li}$ and $\ce{K}$, which would have higher conductivity? Is it the same for molar conductivity? Say, $\ce{LiCl}$ and $\ce{KCl}$, of a litre each. Also, as ...
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1answer
60 views

Problem in reasonning about aqueous solution

I have to build the stability diagram of mercury and I have a problem with this couple: $\ce{Hg^2+}/\ce{Hg2^2+}$ $E^\circ=0.91\ \mathrm{V}$ Exercise says that a the border the concentration is ...
2
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1answer
19 views

Accelerated Oxidation Of Iron When Coating Breaks

I was presented with the following information: If iron is painted, then oxygen and water are prevented from contacting the metal, and corrosion is avoided. Sometimes the iron is coated with a thin ...
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1answer
26 views

Describe the function of a salt bridge, What would happen if the half-cell compartments of a galvanic cell were not connected?

I know, The primary function of a salt bridge is to complete the circuit, so that charge can flow from one half-cell to the other. The second function is to balance the mass by allowing the anions to ...
2
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2answers
41 views

Transistors: How does the gate work?

Two questions: First, how does the gate provide a positive charge by running a current through it? I really just don't see how this positive charge could be achieved, unless you had some sort of ...
3
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0answers
55 views

Finding concentrations in a voltaic cell

The question is "A voltaic cell with $\ce{Ni/Ni^2+}$ and $\ce{Co/Co^2+}$ half cells has the initial concentrations of $\ce{Ni^2+}$ = 0.80M; $\ce{Co^2+}$ = 0.20M. In part (a), I correctly found the ...
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43 views

Bandgap of a semiconductor for photocatalytic water splitting

I'm reading a review article on photocatalytic water splitting (using semiconductors) and I came across the following: "To achieve photocatalytic water splitting using a single photocatalyst, the ...
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2answers
22 views

Why does the cathode have to be made out Cu in a Zn-Cu voltaic cell?

The classic voltaic cell has a Zn anode and Cu cathode. The reduction half reaction occuring at the cathode combines aqueous copper ions and electrons supplied by the anode to form solid Cu. So what ...
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2answers
52 views

What's the source of electrical energy in galvanic cells?

Let's take a simple Daniell cell for example: Where does the energy required to drive electrons through the external circuit and power up devices (like a light bulb) come from? Does the oxidation of ...
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2answers
40 views

How is a car battery recharged?

When recharging a lead-acid battery, how are the terminals of the battery connected to the voltage source. I mean, do we connect the positive terminal of the battery to the negative terminal of the ...
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1answer
64 views

Standard Hydrogen Electrode

Could someone, please, explain to me how the Standard Hydrogen Electrode works and how it is used to measure electrode potentials? Also, why does it have a potential value of zero?
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1answer
25 views

Electroplating a spoon (electrolytic cell) using a electrochemical voltaic cell

I drew a rough picture of the two cells, and marked each position with a distinct letter: The whole reason I am asking this question is that I am bit confused and unsure about some of the chemistry ...
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3answers
321 views

How much ozone is produced by ionization of air and how turn ozone into oxygen

I want to make a plasma speaker. I'm worried about the amount of ozone being produced by the ionization of the air and it possibly not being a safe amount. Even if it doesn't produce a dangerous ...
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1answer
30 views

Why is the deposition of silver more uniform from [Ag(Cl)₂]⁻ (aq) than from Ag⁺?

What determines the uniformity? Just a fun fact I am wondering about, because I saw cyanide solutions used in electroplating.
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1answer
58 views

Electrical conductivity of pool water

What is the electrical conductivity of pool water? I tried to find some information, unfortunately with no success. I need to know it to make an underwater electronic project. Thanks
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2answers
29 views

Hydrogen Fuel Cell and Battery

For hydrogen fuel cell to produce electricity, hydrogen will need to be supplied to the anode. To split oxygen and hydrogen from water and obtain hydrogen, we need to use electrolysis. To use ...
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1answer
18 views

Galvanic Electrochemical Cell Without half cells

Is it possible to create a galvanic cell without a half cell? In the book I was reading, Illustrated Guide to Home Chemistry Experiments, the following lab (Laboratory 16.4) was suggested: add 2M ...
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0answers
43 views

How to determine limiting conductivity of specific ions?

Given a table with equivalent conductivity of certain electrolytes, how can I determine the conductivity of separate ions? I know that you can find the difference between for example K+ and Na+ if you ...
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1answer
25 views

While electrolyzing concentrated aqueous sodium chloride, why is it that chlorine is discharged but not sodium?

Hydrogen and hydroxide both exceed sodium and chlorine in terms of reduction and oxidation potential respectively. While electrolyzing a concentrated solution of aqueous NaCl, it is known that ...
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39 views

Concentration cell lower half cell concentration from measured cell potential

I am trying to find the Ksp of silver thiocyanate: AgSCN(s) --> Ag+ (aq)SCN-(aq) but I need to first prove that the lower [Ag+] = 1.27-12 M, but don't know how to find it. The data I am given: ...
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0answers
23 views

Why does an increase in temperature decrease the EP?

according to the nerst equation, The electrode potential is the SEP minus RT/nF ln([m]/[mn+]). Question is, why? Assuming a simple galvanic cell, we know that in general if the temperature is ...
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1answer
41 views

What's a good resource/book on pH measurements?

Most resources on pH and the electrochemistry behind it that I've found are IMHO too superficial. For example, they explain that an electrode with less than 80% slope should be discarded, but not why ...
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1answer
16 views

How exactly is energy created by oxidative phosphorylation

I understand how the protons and electrons move around through various carriers, shuttles and proteins...But there's this talk of electrons being in "lower in energy" at the end. What does that mean? ...
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2answers
118 views

Why use a salt bridge at all in an electrochemical cell?

I was reading about electrochemical cells and I really don't understand why a salt bridge is needed. Can't you just combine the solutions? I've found a lot of webpages explaining electrochemical cells ...
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1answer
47 views

Anode and Cathode Understanding

I am very much confused: in the cell (Zn, Cu in $\ce {H2SO4}$), Cu is positively charged and is anode, where in this cell (Zn in $\ce {ZnSO4}$ and Cu in $\ce {CuSO4}$), Cu is positively charged but is ...
3
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1answer
34 views

Formation of O₂, Water, and Electricity from Hydroxide?

The Clark Type Oxygen Electrode converts water, oxygen, and electrons into hydroxide via a hydrogen peroxide intermediate: \[\ce{O2 + 4e^{−} + 2 H_2O -> 4 OH^{−}}\] Which is the sum of: \[ ...
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1answer
26 views

Ionize Hydrogen and Oxygen Gas in Electrolytic Cell?

As is well known, water can be electrolyzed into oxygen and hydrogen gasses. However, all redox reactions can be run in reverse. If I were to electrolyze water in 2 closed containers (in order to trap ...
0
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1answer
28 views

Is reduction potential equivalent to the ease of discharge?

Loosely speaking, is the reduction potential equivalent to the ease of discharge in the context of electrolysis? i.e. is it easier to discharge an ion with a higher reduction potential as opposed to ...
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1answer
33 views

Could I settile for galvanized steel over stainless for salt corrosion resistance?

Bear with me, I'll get to the chemistry soon. I have a float tank that I want to attach a skimmer to. Unfortunately, the enclosure is weakened by cutting a hole out of the ABS plastic. The weight ...
0
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1answer
20 views

Reverse electro-plating byproducts

Following this plan, I am wondering what the byproducts of this method are? At the site with the q-tip, the solution turned a bright yellow, with the q-tip turning a dark yellow, almost red. Holding ...
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0answers
24 views

related to potential in electrochemistry

I am working with fuel cell and I got a positive value of oxidation reduction potential at anode whether the fuel cell is voltaic type fuel cell it generate current and potential. How it is possible? ...
2
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2answers
65 views

Anode and Cathode

I am very much confused: in simple voltaic cell ($\ce{Zn,~Cu}$ in $\ce{H2SO4}$), $\ce{Cu}$ is positively charged and is anode, where in Galvanic cell ($\ce{Zn}$ in $\ce{ZnSO4}$ and $\ce{Cu}$ in ...
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13 views

Which causes of quenching increase specifically in electrochemical experiments?

If quenching is seen as a result of running electrochemical experiments on a solution, what kind of processes may be responsible? I'm thinking about UV/Vis spectroscopy, if it makes any difference. ...
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23 views

The feasibility of the electrochemical cell.

This is the question extracted from my country high school level' exam. So it asks to discuss the feasibility of the electrochemical cell to carry out electrolysis of an aqueous solution of sodium ...
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0answers
100 views

Why conductivity of electrolyte decreases on dilution, but molar conductivity increases?

I learnt that on dilution of an electrolytic solution, it's conductivity decreases. However, there is an increase in the molar conductivity of the solution. The book explained the reason by comparing ...
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3answers
71 views

Determine if the following change is an oxidation, a reduction, or neither

The following reaction is not a complete reaction. Determine if the change is an oxidation, a reduction, or neither: $$\ce{CrO4^{-2} -> Cr2O7^{-2}}$$ I know that the answer to this ...
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2answers
35 views

How to use salt spray data in real environments?

I want to convert resultant hours of salt spray corrosion test to estimated values in years for real life environments such as marine. In other words, How could I predict the result of real life tests ...