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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1answer
223 views

why molecules gain energy when heated?

molecules in solid or liquid or gas gain kinetic energy when heated. why is it like this? I request explanation in details please
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1answer
48 views

Could such a galvanic cell exist

Imagine I have a galvanic cell where in one half cell there is a lump of potassium metal and molten KOH electrolyte, and in the other an inert electrode, as well as a molten KOH and the less active ...
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2answers
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Finding the pH of the solution

In this video, at 3:30 min professor solves two equations $$\ce{H2O —> H+ + OH-}$$ and $$ \ce{HCl —> H+ + Cl-}$$ and deduces $[\ce{H+}] = [\ce{Cl-}] +[\ce{OH-}]$. How come this happen from ...
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54 views

Energy level of the product in a cell reaction

I'm very new to chemistry, so please try to be as plain as possible with your answers. I'm studying the chemistry of alkaline cells: The cell I'm interested in has the following chemical reactions ...
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2answers
62 views

What happens when two galvanic cells are placed in series

I understand how a single galvanic cell works, and the relation of equilibrium and the Nernst equation. But this appears to contradict the higher voltage in a series configuration because it ...
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1answer
31 views

Can a car's battery be used as a sacrificial anode?

The title of the question says it all. Can I hook the anode of my car's battery up to the car's shell and prevent it from rusting? Also would the car's battery get electrically charged from this?
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1answer
130 views

Electrochemical cells. Why is a salt bridge needed at all when the system is open? [closed]

I get that the purpose of salt bridges is maintaining the amount of negative and positive charges in the solutions of two connected half-cells when electrons flow from one to the other. But when the ...
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1answer
25 views

Can bronze be electroplated with zinc?

I had to have a motorcycle part cast in bronze that was originally steel. I want to electroplate it with zinc. Will this work? Thanks
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2answers
241 views

Understanding an Electrochemical Cell

Up there is a Electrochemical cell. I have marked the anode (-) and cathode (+) (by taking help from google) but I still need the explanation because such assignment of charges on given electrodes is ...
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1answer
6k views

Direction of flow of current in electrolytic cell [duplicate]

In an electrolytic cell, does current flow from Anode to Cathode or Cathode to ...
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1answer
2k views

How do acids conduct electricity with H+ ions?

I know that ions can conduct electricity, but H+ ions has no electrons! How can it conduct electricity then. Like if we were talking about Cl- or Na+ then these ions do have electrons. But how can ...
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How to write cell equation for $ \ce{H2|H+||OH^{-}|O2} $?

How to write cell equation for $\ce{H2|H+||OH^{-}|O2}$ ?? I thought it should be $\ce {H2 + 1/2 O2 -> H+ +OH- }$. But I was told this is wrong. Which is the correct one. Please explain ??
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Why is it bad to charge a phone to 100%? [duplicate]

I see everywhere that a phone should ideally be between 20 and 80% to work efficiently, but I don't understand why, in an electrochemistry point of view. (I'm not talking about the fact that ...
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1answer
73 views

Working principle of simple chemical cells

I have just learnt about simple chemical cells but I have no idea how to determine which cells will work and which will not and the working principle of those cells. I know that a chemical cell with $...
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2answers
57 views

Would a hydrogen/oxygen fuel cell be a good choice for energy storage and generation in H2 rich atmospheric environments?

So imagine an atmospheric probe sent to enter the atmosphere of a giant gas planet. There would be no need to store hydrogen since a compressor or an inlet with sufficient dynamic pressure would allow ...
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1answer
50 views

Determining the theoretical mass of gas produced through the process of electrolysis

I have a question that has been stumping me for quite some time. I wish to calculate the mass of gas that is produced from varying concentrations of salt (NaCl) through the process of electrolysis. I ...
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1answer
44 views

Can a galvanic electrochemical cell produce current only one time without a salt bridge?

I think that galvanic cell produce current only one time without salt bridge. Potentional difference of both the electrodes are different and the electrons flow till their difference becomes same.Salt ...
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1answer
293 views

Protonation of nitric acid [closed]

I found that reaction: HNO3 + 4.1633363423443E-17 H3O = NO2{+} + OH{-} Please help me understand " 4.1633363423443E-17" term.
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1answer
446 views

Can we create a galvanic cell with only half a cell connected to the ground? [closed]

I have a question about electrical potential in galvanic cells ,suppose that we have only half a cell wich means that we have only one Ox/Red couple (one metal and the other as ionic solution ...)...
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1answer
40 views

Balancing simple Redox equation [closed]

How would you balance these two redox equations? Would you add a '2' in front of Pt2+ and a '2' in front of H+ ?
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2answers
544 views

water in redox reactions [closed]

why water can't react as anode , with metals , in a redox reaction? while studying electrochemistry, i passed through a table with certain metals , all having voltage (potential energy) less than ...
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1answer
47 views

Creating Photovoltaic Solar Cells [closed]

I have a friend who recently bought gallium off of Amazon (just for kicks, I have no idea why). I remember seeing that they use a form of gallium to treat photovoltaic solar cells. That got me ...
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1answer
63 views

Water side-reactions in organic electrochemistry (redux) [closed]

(note: this is a reposting of part of my original post which I was told had too many questions in one post) Please bear with me as I am a chemistry newbie, but I am autistic and have recently ...
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1answer
117 views

Why water is not used in Electrochemistry [closed]

In electro-chemistry, we always use Metal and Metal ion electrolyte. My question is 1. why Water is not used as electrolyte. (because books only refer to Metal/Metal ion type electrods, they dont use ...
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1answer
948 views

How do I determine which is the reduction reaction in a hydrogen peroxide and potassium permanganate solution?

How was it determined that $\ce{MnO4-}$ was reduction, and $\ce{H2O2}$ was oxidation? Also, why wasn’t the equation $$\ce{MnO4- + 2H2O + 3e- -> MnO2 +4OH-}$$ used? Or the $$\ce{H2O2 + 2H+ +2e- -&...
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1answer
470 views

How to remove hydrate from Fe(NO3)3 . 9H2O?

I am currently in a dilemma where I need to have pure Iron (III) nitrate, but I have Iron (III) nitrate 9 hydrate in order to do a lab experiment where I investigate voltaic cell. I am pretty sure the ...
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80 views

Which corrodes faster at 5% NaCl solution at room temperature: Steel or Aluminum? [closed]

Which corrodes faster at 5% NaCl solution at room temperature: Steel or Aluminum? Is it true that Al has high corrosion resistance? Or is it just a myth as stated in this article.
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1answer
141 views

Can I combine two galvanic cells as one and produce infinite current

I thought if I combined 2 galvanic cells so that the middle one serves as the anode for one cell while being a cathode for the other due to difference in standard reduction potential and the middle ...
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2answers
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How to calculate the equivalent weight or N-Factor of compound(acid, salt, base or etc) using electrolysis concept

Our sir, told us about the concept of equivalent weight using electrolysis and Faraday's Law of electrolysis. We got to know ...
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1answer
3k views

Why is AC current used rather than DC current for calculating the conductance of a solution(see body)? [closed]

I was reading the answer of the above question from a book. it said that while using DC current, electrolysis occurs. Hence it affects the conductance of the solution. But if any gaseous product is ...
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1answer
37 views

How exactly lithium metal is produced? [closed]

Wikipedia and other sites say that lithium metal is produced by making the electrolysis of a mixture of half lithium chloride and half potassium chloride "at about 450°C"... What is the chemical ...
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Hi can you please answer me as fast as possible? [closed]

1.If you take a mixture of Znso4 and cuso4 solutions in a beaker and a zinc rod and a copper rod are inserted in it will you get electricity? Give reason 2.A zn rod is dipped in 0.4 M Cuso4 solution, ...