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Results tagged with electrochemistry
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user 1573
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).
5
votes
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What is the meaning of signs in electrode potentials?
Chapter 14 of Harris' Quantitative Chemical Analysis has a helpful section entitled, an intuitive way to think about cell potentials. Here's the corresponding graphic:
In this case, the author is …
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Cathodic protection of aluminium
You might want to look at this link which has a nice general discussion about cathodic protection, with an abbreviated activity series for the metals of interest in cathodic protection. Typically, al …
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2
votes
What is the procedure of designing a salt bridge for a galvanic cell?
You might also want to consider using string as a disposable salt bridge. The general procedure would be to cut 6-8 inches of string, twist it and soak in the KCl solution.
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Cathodic protection of active metals
It is unlikely that a potential applied to a sodium electrode in water would prevent the spontaneous oxidation of sodium by water. Consider the following reduction potentials:
$$\ce{2Na+ + 2e- -> 2N …
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4
votes
If metals want to "lose" electrons, then why will copper ions take electrons from a zinc ele...
Typically, when one uses terms such as "likes to lose" or "likes to gain", we should think of that phrase as "likes to lose relative to...". In your case, when we think about electron configurations, …
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Explanation for the reactions in a saltwater battery with zinc and copper electrodes
The key point you are missing is that the thermodynamic values you report are for standard conditions, meaning that there would also be 1 M $\ce{Zn^2+}$ and 1 M $\ce{Cu^2+}$ in the solutions. The Ner …
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Why the second ionization energy of helium is greater than the first?
The second ionization energy of any element will be greater than its first ionization energy. One way to rationalize this phenomenon is by considering that the first electron is being removed from a n …
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Why is it important to use a salt bridge in a voltaic cell? Can a wire be used?
There's another question related to salt bridges on this site.
The purpose of a salt bridge is not to move electrons from the electrolyte, rather it's to maintain charge balance because the electrons …
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Electrode potentials at interfaces?
(Well, technically it's *not harder to connect two electrodes to one another and hold them in air, but the redox work functions, resistance and capacitance issues that arise in gas-phase electrochemistry …
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Origin of electrode potential and its connection with electric double layer
Let's see if we can tease out the main points here. The images below are taken from Lance and Cole's Analytical Chemistry POGIL workbook.
Microscopic processes at a metal surface exposed to an aqueou …
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