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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Why do we talk about hydrogen evolution for the corrosion of aluminum?

During the corrosion of aluminum, we have the oxidation of aluminum to its ionic form and this reaction is balanced by a reduction of ions in solution. So basically it is the reduction of $\ce{H+}$ ...
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420 views

How do galvanic cells work?

I was wondering how a galvanic cell works If you look at the picture below, if I have magnesium metal in sulfuric acid, will the metal react with the acid to be then turned into magnesium ions and in ...
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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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127 views

Calculating cell-potentials

I have measured the cell potential between a number of metals e.g. Ni, Pb, Al, Cu and Zn by constructing a galvanic cell and then used a voltmeter to measure the potential. Now, if I want to ...
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345 views

what is meant by stability and potential energy of molecules in cases of formation of bonds?

molecules form chemical bonds in order to gain stability. it is said that forming bonds leads to lower potential energy of molecules and makes them stable. what does stability mean? how formation of ...
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3answers
937 views

how to separate aluminum from aluminum alloy

In an attempt to produce aluminum oxide ($\ce{Al2O3}$) also known by alumina I try it out to dissolve two old hard drive frame in brine solution one as the cathode and the second as anode, in the ...
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72 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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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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923 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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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 ...