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Results tagged with reduction-potential
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For questions about the reduction potential (A measure of the tendency of a chemical species to acquire electrons and thereby be reduced) or its applications. Also see the tag [electrochemistry].
3
votes
On Spontaneity of the Redox Reactions
Question 1:
You are mixing the sign conventions for work from physics and chemistry. Sadly, they are not the same. In chemistry, the work done by the system on the surroundings is negative to sig …
- 43.2k
4
votes
Accepted
AgI and AgCl reduction potentials
The answer is hard-soft acid/base theory (or HSAB theory). Essentially, some Lewis acids and bases are hard and some are soft, with a few borderline cases.
Hard acids and bases tend to have
Sma …
- 43.2k
10
votes
Why do carbonates, oxides, and pure metals precipitate before metal sulfides?
Why Do Carbonates, Oxides, and Pure Metals Precipitate Before Metal Sulfides?
They don't. I cannot get to the particular paper you read, but I can provide both a logical and a quantitative argume …
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3
votes
Accepted
Electrolysis of aqueous copper (II) nitrate
There is a misunderstanding in the analysis of your first two half-reactions. Your first two half-reactions are fine. Remember that positive values of $E$ mean the reaction is spontaneous. Negative va …
- 43.2k
6
votes
Derivation of relationship between Gibbs free energy and electrochemical cell potential
I'm surprised your textbook did not derive this equation from the reaction isotherm relationship between $\Delta G$ and the reaction quotient $Q$ and the Nernst equation. The derivation is not hard.
…
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5
votes
Why can we disregard stoichiometric coefficients when computing reduction potentials?
You have to be careful of the difference between $E^\circ$ and $E$. $E^\circ$ is the standard electrode potential at defined conditions. Standard thermodynamic conditions are usually
A temperature of …
- 43.2k
9
votes
Accepted
Why is Cr(2+) a stronger reducing agent than Fe(2+) in water?
The short answer is thermodynamics. Reduction with $\ce{Cr^2+}$ must be more exergonic than reduction with $\ce{Fe^2+}$, we'll get to some numbers in a bit, but let's deal with the concept.
It is tri …
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