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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IIT JEE Narendra Avasthi Electrochemistry [closed]

QUESTION: Pt (s) | H2(g) (1bar) | (0.1M)NH4OH(aq) || (0.1M) CH3COOH(aq) | H2(g) (1bar) | Pt(s) pKb (NH4OH)=5; pKa (CH3COOH)=5; consider 2.303RT/F=0.06 Volume of 0.1M NH4OH in anode half cell ...
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Bondings - Chemistry [closed]

Can anyone please answer these questions? I have deadline in 30 min, I forgot this because my dad was at host for heart attack... please help me:( State the bond that exists between two bromine ...
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It's an electrochemistry question [closed]

Molten aluminum iodide is electrolyzed using graphite electrodes: -Write the overall electrolytic cell reaction (physical states are required).
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Thermodynamics Thermochemistry [closed]

In a chemical reaction, the reactants combine to form the final product. Before making the final product, they form an intermediate complex: C + D -> C – D -> E The reactants C and D form intermediate ...
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What is the state of aggregation of iodine formed during electrolysis of molten nickel(II) iodide? [closed]

Assume the electrolysis of molten $\ce{NiI2(l)}$ (inert electrodes) in a cell. The cell with a heating element is in the room; the room is at $\pu{25 °C}$ and $\pu{101.3 kPa}.$ The half-reaction for ...
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Is it possible for a carboxyl group (R-COO-) to reduce a sodium ion? [closed]

Is it correct that a carboxyl group can act as a reducing agent, and, sodium as an oxidizing agent? R-COONa —> R-COO + Na+ + e-.
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Aluminium, Carbon, Aluminium Sulphate battery. What's the reaction?

I made galvanic cells from the following items (while trying to do something else), and they give between 0.6 V and 1 V per cell. Aluminium foil – negative terminal Carbon (these work: charcoal ...
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Conditions for ranking of negative ion discharge order [closed]

My teacher told us about the negative ion discharge order $$\ce{SO4^2-} < \ce{NO3-} < \ce{OH-} < \ce{Cl-} < \ce{Br-} < \ce{I-}$$ in the sense which ion would discharge to electrodes ...
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1answer
100 views

Calculating the biological standard potential

I have an electrochemical cell with following overall reaction: $$\ce{5 Sn^4+ + 2 Mn^2+ + 8 H2O <=> 5 Sn^2+ + 2 MnO4- + 16 H+}$$ I have defined the half reactions as: $$ \begin{align} \ce{Sn^...
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Problem interpreting CV diagram in a paper

I am an undergraduate materials science student. I am currently preparing to conduct some research over the summer on alkaline electrolyte membrane fuel cells and have been reading some papers to get ...
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Electrochemistry Question [closed]

I cant find the answer this question. Please answer it.
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Why is it necessary to bubble hydrogen through the electrolyte in a hydrogen electrode? [closed]

I searched from the internet but i got confused. I was not sure about my answer.
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Where do the electrons in lead–acid battery come from? [closed]

$$ \begin{align} \ce{PbO2 + H2SO4 &-> PbSO4 + H2O + O} &\quad &\text{(anode)}\\ \ce{Pb + H2SO4 &-> PbSO4 + H2} &\quad &\text{(cathode)} \end{align} $$ The cathode’s $\ce{...
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Nernst equation for mixed cathode battery

What is the Nernst equation for a mixed cathode battery or a cell where there are multiple half reactions? I assume it is similar to unequal voltage connected in parallel? https://youtu.be/XoLzn49IZjM ...
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Mass Transport and Ion Transport - Li-ion Batteries

I am new to the field and trying to grasp the theories/ physical phenomena behind the Li-ion batteries. I came across two phenomenons 'Mass transport' and 'Ion transport'. As I understood Mass ...
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1answer
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Contradiction in variation of conductance and conductivity on dilution

I do conceptually understand that on dilution conductivity decreases and conductance increases but if we look at the formula of conductivity, a contradiction seems to arise. $$\kappa=GG^*$$ where $\...
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How is the value of n calculated in the Nernst equation?

I'm just not quite sure how the value is found. I know it is the number of electrons in moles that are transferred in the equation but I'm struggling to understand more complex examples. For example, ...
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Effect of charge density on electrolysis of dilute sulphuric acid

I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen: $$\ce{2 HSO4- -> H2S2O8 +...
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1answer
42 views

Why can't two 3° free radicals combine?

In Kolbe Electrolysis, my teacher told that when a 1° or 2° free radical is used, we get alkanes through dimerisation. Why wont dimerisation occur for a 3° one??
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What happens to electrolysis of dilute NaCl? [duplicate]

We know that pure water has approximately $10^{-7}$ ions of $\ce{H+}$ and $\ce{OH-}$ due to auto ionisation property but what after these ions? Will electrolysis of $\ce{H2O}$ stop and electrolysis of ...
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1answer
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Why does molar conductivity depend on the volume of the solution? [closed]

I have been searching the answer to this question everywhere and (almost) the only answer I get is to formula based: ‘Since molar conductivity = k / M = k/1/V for one mole = kV Therefore molar ...
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Did both temperature of nernst equation same

I saw the nernst equation I have a doubt.Did the temparature at which Standard potential is measured is also the temparature at which electrode potential is measured. I mean Did the temperature (T) ...
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3answers
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Trying to understand the chemistry in an iron carbon battery

I am trying to understand the chemistry that occurs in an iron carbon battery during charging. The negative electrode is iron, the positive electrode is carbon. The electrolyte is iron(II) chloride. ...
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4answers
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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 were oxidized to $\ce{Cl2}$. But we don't see any $\ce{O^2-}$ at all. My pre-...
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Calculation of the cell potential of a lemon battery experiment

I have the following problem that I would like to get checked. I’m told to calculate the cell potential of a simple lemon battery experiment. After Finding out the oxidizing agents and the reducing ...
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What is the likely mechanics as to why moist white Fe(OH)2 , on air exposure, forms a green tint?

The question is based on this Wikipedia comment: Iron(II) hydroxide is a white solid, but even traces of oxygen impart a greenish tinge. The air-oxidized solid is sometimes known as "green rust". ...
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why does galvanic cell stop working when charge neutrality is not maintained? [closed]

In galvanic cell, salt bridge maintains charge balance between solutions. If there's no salt bridge, charge neutrality will be broken as solution(anode) becomes positive and that of cathode becomes ...
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4answers
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What happens when a piece of copper is placed in 1M HCl?

I know that the answer is that nothing happens, but the explanation is confusing me in some places. Firstly, we are given that: \begin{align} \ce{Cl2 + 2e- &-> 2Cl-} & (E &= \pu{1.36 V})...
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What is the substance turning salty water green when electrolysed? [duplicate]

I am a student and I take O.L. Chemistry, in my knowledge I know if I electrolysed concentrated aqueous NaCl solution I should get Hydrogen evolved at the cathode and chlorine at the anode. I did an ...
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Are the reactions in a simple cell overall exothermic? Why?

For context, I'm in high school. I'm trying to mentally connect electrolysis with the concept of energy changes and kinda having trouble. I understand the bottom line is that a simple cell converts ...
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What are possible anode materials for copper(II) sulfate electrolysis?

I'm a student doing a research paper about copper sulfate electrolysis with an experiment by varying anode material, and aside from Pb and graphite (and pure Ti which I think wouldn't work without ...
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Equilibrium cell potential question

In an attempt to wrap my head around the basics of electrochemistry I'm working my way through Wesley R. Browne's 'Electrochemistry' primer. With regards to the equilibrium potential of an ...
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For a copper/copper sulfate half reaction, do sulfate anions move to the anode and lose electrons?

In my (high school) textbook, there's an example on finding the charge on 1 mole of electrons, which involves performing the electrolysis of an aqueous copper (II) sulfate using a copper anode and a ...
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How does polarity of a solvent increase conductance of electrolyte?

My textbook says that electrolyte ionize more in polar solvents and greater is the polarity, larger is the conductance. But if polar solvents (lets take water) causes the formation of shells around ...
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Is my understanding of cyclic voltammetry correct? [closed]

So recently I've been roped into doing some CV and I'm trying to wrap my head around the fundamentals of the science behind it (and electrochemistry more generally! Bare in mind I'm very much not an ...
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1answer
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How do you work out whether reduction would occur based on reduction potentials [closed]

I'm having a bit of trouble with standard reduction potentials. Specifically, when you're given a table of half reactions and reduction potentials...is the potential of the reverse reaction (the ...
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1answer
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How ro interpret the given cell representation? [closed]

I have encountered cell emf having a reactant and product in the subscript. But this is the first timeI have witnessed 3 elements/compounds/ ions. How do i interpret this and what would be the ...
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Writing a electrochemical cell representation in correct way [closed]

The answers to following question seem wrong to me. The books has plainly told correct answer is (3), but it seems incorrect to me. Please help.
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1answer
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Is this galvanic cell representation right?

Question 13. In the galvanic cell: $$\ce{Pt(s) | I2(g) | I-(aq) || Fe^3+(aq) | Fe^2+(aq) | Pt(s)}$$ Representation of anode is incorrect and cell will not work. $[\ce{Fe^3+}] = [\ce{...
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Which will be oxidised between water and Copper?

I have always read that the one having higher discharge potential undergoes the reaction( oxidation or reduction). But In this example why is there also oxidation of water?
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2answers
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What is the magnitude of the current in an electrolyte? [closed]

if a battery is connected to an electrolytic cell, what is the magnitude of the current in the electrolyte compared to the the magnitude of the current in the wire? This doesn't make sense to me ...
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Does voltage or current matter most when setting up an efficient water electrolyzer? [closed]

I am setting up a homemade water electrolyzer for producing hydrogen gas, which will solely be used by myself for experimental purposes, and have heard the wattage used has a large part to play in ...
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Calculating Ka using Nernst Equation

I've heard multiple times that the Nernst Equation could be used to calculate K$_a$. How would one calculate the acidity constant, K$_a$, of a specific acid, using the Nernst Equation? The equilibrium ...
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3answers
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Activities and molar concentrations

I would be really happy if someone would clarify the term "chemical activity" and its implications for me, and also how it is related to the concept of molar concentration. My textbook fails at ...
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1answer
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Nernst equation and equilibrium

I am currently stuyding electrochemistry, and recently I've stumbled upon a problem where one is supposed to calculate the concentration of Fe3+ ions after a solution containing Fe2+ was titrated ...
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Protons and osmotic potential

In a hypothetical enclosed membrane only permeable to water (including hydronium), where inside the pH is lower than the outside, would water move inside?
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Conductometric titration curve when KCl is gradually added to AgCl solution [closed]

The situation given is that we are performing conductometric titration where KCl is gradually added to AgCl solution and we have to plot the variation of conductivity with the volume of aq. KCl added. ...
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3answers
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pH implications of redox balancing half reaction method

I have seen similar questions, but I’m asking a new question as far as I know. Why is water instead of hydroxide ions used to balance oxygen atoms in redox half equations? asks about using hydroxide ...
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Specific conductance of KCl

Question: A conductivity cell containing distilled water has a resistance of $\pu{454 k \Omega},$ while the same cell containing $\ce{KCl}$ solution prepared in the same sample of water shows ...

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