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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Electrochemistry galvanic cell problem

A galvanic cell consists of a standard hydrogen electrode and a copper electrode. $$\begin{alignat}{2} \ce{2 H+ (aq) \;&<=> H2 (g)}\quad &&E^\circ = 0.00\ \mathrm{V}\\ \ce{Cu^2+ ...
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23 views

What is the Difference between difference between Standard Electrode Potentials and Standard Reduction Potentials?

As the question suggests I am wondering the difference between standard electrode potentials and standard reduction potentials. I know that they are both a measure of the Voltage from certain ...
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1answer
44 views

Electrode equations problem

Question Suppose you have a cell set up between a copper metal/copper(II) ion electrode and a reference electrode. Under standard conditions, the emf of this cell was −0.07 V. The standard electrode ...
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42 views

Calculation of optimal current density

I'm trying to figure out what my optimal current density would be in respect to the limiting current density. How do you calculate concentration polarization and limiting current density in an ...
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1answer
41 views

Does water vapor in the air oxidize copper?

My friend is installing copper pipes in his house, which is going to be in a humid area, and he says that copper will only be oxidized by the air and the excess water vapor in the humid air won't ...
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35 views

Why don't human CO2 emissions react with electrostatics? [closed]

Why don't static human $\ce{CO2}$ emissions react with electrostatics, which are mostly in the ionsphere before reaching the ozone layer?
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25 views

Direction of electric current in galvanic cells

My textbooks says it is from anode to cathode. But I think it is reverse because direction of electron flow is from anode to cathode. This textbook isn't really reliable and on the web, I only found ...
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25 views

What is the purpose of the solution in a galvanic cell?

In other words: What is the purpose of the solution that the electrodes are immersed in, in a galvanic cell, and is it possible to generate a current without any solution?
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2answers
74 views

Formation of species in electrolysis

I understand the principles of electrolysis of salts in aqueous solutions, but there are two points on which i am unsure. At the positive electrode, how can you work out which ions will ...
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1answer
44 views

Why exactly are standard potentials additive?

I don't really study chemistry so while my question may be very obvious, its not obvious to me: If we take an electrochemical reaction like $$\ce{2Fe^2+ + Au^3+ -> 2Fe^3+ + Au+}$$ We can find ...
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1answer
45 views

Reaction of sulfate ion in copper sulfate electrolysis

I am planning to try copper plating a piece of metal by performing electrolysis on an aqueous solution of copper sulfate. I plan run an electrical current with the metal I want to plate as the cathode ...
3
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0answers
16 views

How do I calculate the viscosity of a mixture of toluene and isopropanol?

I am trying to understand why my nanoparticles will only electrophoretically deposit in a non-polar solvent and a non-polar/polar solvent mix but not in the polar solvent. I am hoping to use zeta ...
3
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2answers
36 views

Why can't a primary cell be recharged?

The explanation I have found is that primary cells have irreversible reactions, so passing current in the opposite direction cannot recharge the cell. But as far as I understood it, no reaction is ...
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2answers
62 views

Change in current in an electrolytic cell over time

Why does the current increase over time in an electrolytic cell with a $\ce{CuNO3}$ electrolyte. The current increased about $2~\mathrm{A}$, and the temperature increased during the experiment to ...
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1answer
45 views

galvanic corrosion in the wild: where is the reduction?

Galvanic corrosion occurs of an active metal (i.e. iron or zinc) in contact with a passive metal (i.e. copper) in a conductive solution. A famous example is the corrosion of iron girders in contact ...
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1answer
35 views

How do I predict the spontaneity of a metathesis reaction?

How do I predict the spontaneity of a metathesis reaction? Is it a matter of summing up the differences between their ions' standard reduction potentials? Take the salt metathesis reaction between ...
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1answer
35 views

Why does the anode solution contain Sn2+ in a Sn-Cu voltaic cell?

Suppose you have the following voltaic cell: $\ce{Sn_{(s)}|Sn^{+2}_{(aq, 1.0 M)}||Cu^{+2}_{(aq, 1.0 M)}|Cu_{(s)}}$ and the salt bridge is $\ce{KNO_3}$. What I don't understand is why you need to have ...
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1answer
35 views

How does an electrolyte react to voltages below its electrolysis potential?

An electrolyte can be electrolysed by a voltage higher than the reverse reaction’s cell potential, while conducting a current in the process. But what happens at the electrodes when the applied ...
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1answer
64 views

Does the Battery Bounce Test actually work?

I heard that a good way to test if a battery is dead or alive is to see if it bounces. Supposedly, dead batteries bounce higher than living ones. Can someone tell me if this is a legitimate claim, and ...
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1answer
28 views

How do I write many cyclic voltammetry curves in Nova?

We are making an electrochemical research on supercapacitors that involves checking stability of our material. That requires repeated writing of cyclic voltammetry curves. Our goal is to write at ...
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1answer
34 views

Electrodeposition of Ni

How can one electrodeposit Nickel on a substrate using a liquid crystal template? substrate is Indium Tin Oxide coated plate and the template is cetyl trimethylammonium bromide(CTAB)+WATER+ETHANOL
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2answers
43 views

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 $$\ce{2H2O + 2NaCl -> Cl2 + H2 + 2NaOH}$$ or ...
2
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1answer
46 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
79 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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25 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
49 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
43 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
82 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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2answers
312 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
99 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
52 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 ...
3
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28 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
65 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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42 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 ...
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1answer
50 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
66 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 ...
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1answer
23 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
36 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 ...
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2answers
44 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 ...
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115 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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71 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
31 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
64 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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45 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
137 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
37 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
337 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
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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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76 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
36 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 ...