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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6
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1answer
211 views

Why does the specific conductivity against concentration curve for NaCl curve more than KCl?

I understand why KCl has a higher specific conductivity than NaCl.. but I dont understand why the curvature is more significant for NaCl (KCl is a straight line). Ive provided a picture of this here, ...
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0answers
35 views

Could Carbon Monoxide be reduced by oxidising a more reactive metal?

After studying displacement at school, I wondered if it is possible to reduce the toxic gas of carbon monoxide to less harmful and more useful substances, like so: Carbon monoxide + metal -> Carbon ...
3
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1answer
113 views

calculate cell potential for the voltaic cell where its involving the two cobalt species with Copper

Calculate the cell potential for the voltaic cell that results when the following two half-cells are connected at $\pu{25 ^\circ C}$: (1) A platinum electrode inserted into a solution of $\pu{0.10 M}$ ...
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1answer
94 views

Schrodinger's Equation and Wave Function

So I understand that there exists the shrodinger's equation, which on solving,gives the wave function of an electron. The wave function as I understand, gives all possible information about an ...
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1answer
507 views

NaCl electrolysis with copper electrodes

Considering the aqueous $\ce{NaCl}$ is already concentrated. If we were to use copper electrodes instead of inert graphite electrodes: Would copper react with the evolved chlorine gas to give $\ce{...
2
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2answers
273 views

Origin of electrode potential and its connection with electric double layer

Recently, I was learning about electrode processes and I came across the topic of "electrode potentials". I understood that at equilibrium, a potential difference was generated at the ...
3
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1answer
36 views

Why is there no salt bridge for hydrogen–silver bromide cell?

What is the reason there is no salt bridge for this cell? $$\ce{Pt(s) | H2(g) | HBr(aq) | AgBr(s) | Ag(s)}$$
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1answer
57 views

Derivation and visualization of cell potential dependency on temperature and entropy

Working from the thermodynamic identity $$\Delta{S} = -\left(\frac{\partial{\Delta{G}}}{\partial{T}}\right)_p,$$ is it allowed to integrate both sides to obtain an expression derived from the Nernst ...
2
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1answer
38 views

Do I have to systematically show the protons in my reaction equation to find the Pourbaix diagram's line equations?

I was trying to get the line equation for the Pourbaix diagram for the couple $\ce{Ni(OH)2}/\ce{Ni}.$ I can write two chemical equations for basic and acidic conditions, respectively: $$ \begin{align} ...
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4answers
798 views

In electrolysis, why does each atom wait to turn into gas until they reach a particular electrode?

More specifically why don't bubbles of both oxygen and hydrogen appear everywhere? If the electricity just breaks apart bonds wouldn’t the hydrogen and oxygen just immediately turn into gas and bubble ...
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1answer
78 views

Why does contaminated brake fluid conduct electricity? Using a voltmeter to test for water contamination in brake fluid

Contaminated brake fluid conducts electricity. In the automotive repair world, brake fluid is considered contaminated by two ways: Brake fluid is hygroscopic. Higher water content in brake fluid ...
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1answer
146 views

EMF - Intensive or Extensive Property

In electrochemistry, I know that standard emf of a cell (also called standard electrode potential (E°)) is an intensive property. But, I wanted to know whether non-standard emf will also be intensive ...
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1answer
109 views

Electrolysis of brine solution gives sodium hydroxide , chlorine and hydrogen gas but catner kellener cell it forms amalgam [closed]

Sodium hydroxide is generally prepared commercially by the electrolysis of sodium chloride in Castner-Kellner cell. A brine solution is electrolyzed using a mercury cathode and a carbon anode. Sodium ...
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0answers
16 views

How to estimate gas yield from polarization curve of the electrolyser

A good characterization of electrical properties of the alkaline water electrolysis of the water is its polarization curve. Is there a reasonable way to estimate gas yield for each point of the ...
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1answer
89 views

Electrochemistry -gold recovery

I was wondering how to answer a question I got from my students about the possible recovery of gold from solution. We just finished the reaction between silver ions and copper metal and they wondered ...
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1answer
93 views

How does strong acids conduct electricity in water?

How do strong acids conduct electricity in water? I have just studied ionization of water and I'm confused about some points. First: I know that water ionizes in a very small amount ($10^{-14}$) so ...
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1answer
33 views

Corrosion rate of aluminium

In which conditions the corrosion rate of aluminium is faster? a) acidic conditions b) neutral c) alkaline conditions I know that corrosion can be in a and c cases but I dont know when it'll be faster....
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2answers
60 views

How do oxide formations affect voltaic cells?

I asked a question previously on here but still have some confusion. To briefly summarize, I made a voltaic cell for a school project with 0.1 M copper nitrate and varying concentrations of aluminum, ...
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2answers
71 views

What starts the reaction in a voltaic cell?

In a zinc-copper voltaic cell, What causes the initial electron movement from the zinc to the copper? I understand that copper would pull the electrons more strongly than zinc, but only if it is ...
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1answer
30 views

Why does lower concentration cause the metal atoms to dissipate more?

In a concentration cell, one can measure a voltage because in one of the half cells (the one with lower concentration electrolyte), the atoms tend to dissipate more into the electrolyte as ions, ...
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0answers
40 views

Weight Percent Standard State

I am having one doubt in weight percent standard state...Please see the quote(Taken from the legendary thermodynamics book by David Gaskell): If deviations from Henry's law occur below 1 wt %,then ...
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1answer
82 views

Can you separate CO2 into carbon and oxygen using pyrolysis? [duplicate]

I recently read about a pyrolysis process that separates methane into Carbon and Hydrogen. The basic technology/process is you have a vertical column of super-heated liquid metal and you inject ...
2
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1answer
76 views

What does the salt actually do during electrolysis?

Pure water does not conduct electricity. When you dissolve a salt like $\ce{Na2SO4}$ in water the solution becomes a better conductor. If electrolysis is done on this solution, oxygen and hydrogen ...
3
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1answer
698 views

Why isn't my electrochemical cell producing its potential voltage

For a school project, I am testing how concentration affects the voltage output of three metals. So I am building voltaic cells with 0.1 M copper nitrate and 0.1 M, 0.01 M, and 0.001 M of zinc, ...
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0answers
32 views

Surfactant micelles from glassware

FYI to start- I'm not a chemist by training, so assume I'm missing some basic knowledge of the field. I've been trying to do some electrodeposition with an iridium tetrachloride-based solution, and my ...
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1answer
319 views

Determination of Cell constant

I read that cell constant is measured indirectly using a solution with known conductivity(like KCl). But then how was the conductivity of that solution measured? (Is it by some theoretical ...
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2answers
193 views

Linking an electrochemical cell to an electrolytic cell

Electrolysis occurs when a non-spontaneous redox reaction occurs when electrical energy is put into it. An electrochemical cell functions by using two redox reactions to facilitate movement of ...
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0answers
35 views

Question about reversible chemistries in anode and cathodes

I've been reading a lot about cathode and anode chemistries recently involving Li-ion cells and solid state chemistries. What makes a decent anode seems to make sense as it is a lower potential area ...
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1answer
102 views

How do you connect a battery to a galvanic cell in order to reverse the flow of electrons?

Assume you have a galvanic (voltaic) cell with E = +2V. If you wanted to reverse the current by inserting a 9V battery, which end of the battery should connect to the cathode of the galvanic cell? The ...
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0answers
25 views

Do the ions of the two electrolytes mix in the salt bridge of a galvanic cell? [duplicate]

I read several times in books and on the internet that they do not, but this illustration on the Wikipedia confused me because of the zink and the sulfate ions are written above the arrow (image ...
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2answers
92 views

How to measure chlorine content using ORP sensor?

In my project I need to measure pH, turbidity, and chlorine level of treated drinking water. I found sensors for measuring pH, turbidity, and also chlorine. The actual problem begins is that the cost ...
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2answers
246 views

What is the essence of chemistry? [closed]

I am an engineering student who loves physics but didn't quite enjoy chemistry. a. When I was in high school chemistry to me was something not as inspiring as physics but in which I couldn't solve ...
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0answers
33 views

Why does the molar conductivity plot behave this way?

On the left image.. we see that specific conductivity is increasing at a decreasing rate, eventually plateauing as it reaches a maximum. I am unable to reconcile this with the molar conductivity graph ...
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2answers
112 views

Do ions still “conduct electricity” if a physical connection made by aqueous electrolytes between the anode and the cathode is nonexistent?

I always had the misconception that when people say ions conduct electricity, what they actually mean is a connection is made between the cathode and the anode by the ions and electrons can flow from ...
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2answers
322 views

Electrolysis with two similar metals

I've researching electrolysis recently, and all of the examples I've seen use two different metals as the cathode and anode. In my attempts to make a hydrogen producing cell (table salt used as the ...
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0answers
20 views

Aluminum Battery with PAC setup : Rapid voltage drop problem after a charge

I am a retired man and seek for activity. I dont have background in chemistry but I want to learn an aluminum battery..the known problem is my aluminum metal get eaten and also corrosion even if using ...
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1answer
36 views

How long do rechargeable Batteries last vs Standard Batteries?

Ordinary Batteries will deplete most of their Power in a 10 year period. What happens to rechargeable Batteries? How long would they still functin properly? Hope this is the right community for this ...
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2answers
212 views

Why can't nitrate ion in aluminium nitrate solution oxidise copper when a copper spoon is used to stir the solution?

I have been recently studying electrochemistry and I came across the electrochemical series. A question was asked saying what will happen if a copper spoon is used to stir an aluminium nitrate ...
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0answers
57 views

Find the electrode potential of a solution

I'm stuck with the next exercise. What is the electrode potential (against NHE) in the solution prepared by adding 90 mL of $\ce{ KI }$ 5.0 M to 10 mL of $H2O2$ 0.10 M, with a buffer at pH 2.0? First ...
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1answer
50 views

Conditions for spontaneity of redox reaction among redox couples with equal standard reduction potentials

A question from the university course: Could a redox reaction spontaneously occur among the redox couples $\ce{A_{ox}}/\ce{A_{red}}$ and $\ce{B_{ox}}/\ce{B_{red}}$ within non-standard circumstances ...
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1answer
195 views

What is the emf of a galvanic cell?

I am getting confused between EMF and potential difference of a cell. But i know that when a charge moves against an electric field it's potential energy increases which can be used to do some work. ...
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2answers
92 views

Can iron oxide in well-point water be removed by electrolysis? [closed]

Can iron oxide dissolved in well point water stored in a 1000l plastic tank be removed by using a 12V battery charger and simple electrodes? If so what material should the electrodes consist of?
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0answers
53 views

How does the cation radius affect the rate of increase of the electrical conductivity of a salt in aqueous solution?

Potassium chloride has a greater ionic radius than sodium chloride. How does this affect the fall in rate of increase in conductivity as concentration concentrations? I know the following factors ...
-4
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1answer
163 views

Why does it so long for a Lithium-ion battery to be charged from 98% to 100%? [closed]

Why does it so long for an Lithium-ion battery to be charged from 98% to 100%? It is not even comparable to the effort I exerce to pump my bike tires from 95 psi to (the minimally usable) 100 psi. ...
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1answer
104 views

Are the potentials of the electrolytes equal in Galvanic cell?

My book defines Electrode Potential for a Galvanic Cell as follows: A potential difference that develops between the electrode and the electrolyte is called Electrode Potential $$E= V_{electrode} - ...
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1answer
205 views

Can someone explain why the electrical conductivity of magnesium chloride decreases with increasing concentration?

I was under the impression that the electrical conductivity should increase initially, then begin to plateau, then fall past the saturation point for strong electrolytes. However, from this, I see ...
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0answers
33 views

Driving force of Galvanic cell

Work can be extracted from galvanic cell which has a negative Gibb's free energy. I was wondering what is the driving force of it: I would naturally think its the Gibb's free energy, but the gaps ...
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0answers
107 views

How to derive the Henderson equation for liquid junction potentials given in Bard and Falkner?

The general equation for liquid junction potential is given by $$E = {-RT\over F}\sum_i\int_a^b{t_i\over z_i}d ln(a_i)$$ Where a and b are the two phases, $t_i$ is the transport number of the ions and ...
7
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1answer
940 views

What is the optimal voltage for storing a 3.7 V lithium polymer battery?

According to this website, storing a lithium polymer (LiPo) battery/cell at around 40% capacity would be more beneficial for the lifespan of the LiPo cell comparing storing the battery at 100% ...
0
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0answers
20 views

Can I mix pressures and concentrations when finding equilibrium constant? [duplicate]

In order to find the equilibrium constant (or reaction quotient) I know I can find the value as the products over reactants raised to coefficient exponents. But, in all of the problems I have had to ...

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