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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26 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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Ratios of produced gases in water electrolysis

I just did a little water electrolysis experiment at home by immerging two aluminum electrodes in water with a small amount of table salt. The voltage of the battery was 6 V. What surprised me is ...
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1answer
267 views

Why does magnesium deposit during electrolysis of a molten mixture of MgI2 and AlBr3?

During the electrolysis of mixed salts, I read, and was taught, that the cation with a higher ionization energy would deposit at the cathode. I was also told that you cannot use the standard electrode ...
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1answer
52 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 ...
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1answer
87 views

Standard electrode potential of copper disproportionation

I am having some difficulty with the below. It says the standard potential for $\ce{2Cu+ (aq) -> Cu (s) + Cu^2+ (aq)}$ is $\pu{0.36 V}$. The relevant half equations are: $\ce{Cu+ + e- -> Cu}$ (...
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Are these reactions redox reactions? [closed]

I'm supposed to tell whether the following are redox reactions. (1) K+ + H2O --> KOH + H2O (2) Cu + 2AgCl --> CuCl2 + 2Ag I tried listing out the oxidation numbers for each element in both ...
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1answer
52 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 ...
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1answer
637 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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5answers
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Is there a way to “electroplate” wood with copper?

Maybe wood can be coated with copper (II) sulphate first, or roasted in order to form a conductive charcoal (carbon) layer.
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2answers
40 views

Proper method to electroplate aluminum?

I'm looking to plate some aluminum with silver using a basic solution. My first attempt was to use sodium carbonate to make silver acetate. I sped up the process using hydrogen peroxide. I used the ...
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2answers
57 views

How does increasing the Hydrogen Concentration of CuSO4 (electrolyte) affect electroplating of copper

I'm trying to find an answer as to how lowering the pH of the CuSO4 solution during electroplating of copper affects the amount of copper deposited onto the cathode. My very basic understanding is ...
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Copper layer doesn't stick after Copper electroplating

I am playing around with copper plating using Copper Sulfate solution with electricity. I am using 2-2.5 volts as power source and around 100-500 mA. It is actually a very small container around 100 ...
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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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Molar Conductivity [closed]

I had a doubt regarding molar conductivity.We know that molar conductivity = (conductivity × 1000)/ Molarity.Considering the above equation, Molar conductivity is directly proportional to conductivity ...
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2answers
57 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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1answer
40 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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0answers
34 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
68 views

Can I anodize an aluminum coating on steel to have better corrosion inhibition for the steel?

I am planning to coat aluminum on steel and I want to give the steel its maximum corrosion protection. Is anodizing the coating necessary?
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1answer
55 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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28 views

Electrolysis of NaOH under various conditions [closed]

In theory, I've been taught that electrolysis of sodium hydroxide solution produces oxygen at the anode and hydrogen at the cathode since the H+ ions have higher reduction potential (or lower ...
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2answers
59 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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0answers
21 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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42 views

A doubt in a problem on electrometallurgy

I do not understand why the number of cathodes has been considered as 30.They give an explanation that each half surface in the two extremes are to be neglected.I do not understand why should one end ...
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2answers
150 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
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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
81 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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212 views

Is there a potentiometric method for monitoring salt formation in organic solvent?

I work in a pharmaceutical R+D lab, and currently aim to develop a validatable potentiometric method for determining the optimal amount of acid to add to a basified small organic molecule for ...
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1answer
450 views

Why does increasing the concentration of the salt bridge in a galvanic/voltaic cell increase voltage?

I recently set up an experiment with 1M half cells made up of zinc and copper nitrate. They were connected with a sodium nitrate salt bridge of varying concentrations. As the concentration doubled 5 ...
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0answers
35 views

Reference for Voltage of Galvanic Cell versus Temp. data request

Due to COVID-19, I am unable to collect data for my chemistry lab report. My teacher has tasked me to find data for the relationship of temperature and voltage of a galvanic cell, or I could do an ...
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2answers
349 views

Pressure-dependence of electrolysis voltage

I'm trying to better understand electro-chemistry, so please explain why this second-kind perpetual motion device won't work. I guess it's safe to assume it won't work one way or another. There is a ...
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2answers
67 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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3answers
5k views

Difference between intercalated lithium and metallic lithium (Li-ion batteries)

I have a question about Li-ion batteries. I sometimes see the two terms - intercalated lithium and metallic lithium - used when talking about this type of batteries and I was wondering what is the ...
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0answers
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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
31 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
100 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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1answer
79 views

Copper brightness change

In an electrolysis situation I have identified a slight brightness change on a copper electrode. What might have happened? I'm dealing with different experiments and this reaction occurs in some of ...
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1answer
152 views

Does Intercalation and Deintercalation of Lithium ions occurs in Half Cell?

The important feature of Lithium ion batteries is the ability to intercalate and deintercalate lithium ions in anode and cathode . However when we use half cell, using lithium metal foil as anode, ...
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0answers
31 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
353 views

what should be the onset potential using cyclic voltammetry?

I am working for PEM fuel cell cathode material. I am confused regarding the onset potential determination for my catalyst (CV attached, fig 1 is complete CV while fig 2 is its zoom image for clear ...
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1answer
680 views

Kohlrausch Law and conductivity

Im writing up a lab report at the minute and part of it concerns ions in solution and how they affect conductivity. I've been doing lots of reading and I think ive got the grasp of most of it, but its ...
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1answer
98 views

Current in a Lithium Ion Battery

I am trying to find the current transferred to the anode and cathode of a Lithium Ion Battery at different voltages. I know the temperature (approximately) of the battery, the battery's starting ...
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1answer
52 views

Why is the cathode of a lithium-ion battery metallic, which is the opposite of most other batteries? [closed]

In most types of batteries, primary and secondary, the metallic electrode is the anode, and a non-metal acts as cathode. Or a pure metal is the anode, and the cathode is a metal oxide. Why is the ...
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1answer
43 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
49 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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4answers
641 views

In NaCl electrolysis, why does chlorine ion get oxidized but not oxygen ion? [closed]

In $\ce{NaCl}$ electrolysis, on the positive electrode (aka. on the electrode where oxidation happens), $\ce{Cl-}$ ions are oxidized to $\ce{Cl2}$. But why don't we see any $\ce{O^2-}$ (naturally ...
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2answers
49 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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1answer
100 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
39 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 ...
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1answer
132 views

Sodium Sulfate or Sodium Carbonate for electrolysis in water

I am not a chemist but I have a question regarding electrolytes in electrolysis. I have done a lot of reading but cannot find the answer I'm looking for regarding Sodium Sulfate (or Sulfide) I intend ...
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1answer
105 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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