# Questions tagged [reduction-potential]

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].

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### Standard electrode potential from thermodynamic data

I am looking for a reference where the values of standard electrode potentials of simple reactions calculated from the heat of submilation, energy of ionization, energy of hydration and possibly other ...
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### Correct Interpretation of Apparent Charge Transfer Coefficients

Good day guys, I was looking over some $i$ vs $\eta$ for a redox reaction. The main reaction taking place is: $$\ce{N2 + 6 Li+ + 6 e- -> 2 Li3N}$$ Plotting the data and fitting the Tafel equation ...
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### Determining an unknown E° from two similar half ox/redox reactions

Use the oxidation half-cell and reduction half-cell, $\ce{Cr^3+/Cr^2+} = \pu{0.424 V}$ and $\ce{Cr^3+/Cr2O7^2-} = \pu{1.32 V}$, to determine the $E^\circ$ for $\ce{Cr2O7^2-/Cr^2+}$: a. $\pu{-1.75 V}$ ...
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### How does cell potential change with temperature for positive enthalpy and negative entropy?

A recent United States National Chemistry Olympiad question asked: A certain voltaic cell has a standard cell potential that increases with increasing temperature. Which best explains this ...
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### Fundamental understanding of electrode potentials

The electrical double layer, is commonly used to describe the origins of electric potentials that is fundamental to electrochemistry. This model is quite outdated from my understanding, but it is ...
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### In a voltaic cell with standard hydrogen electrode is the measure half cell always the cathode?

I am a bit confused. My openstax textbook states: "When the half-cell X is under standard-state conditions, its potential is the standard electrode potential, E°X. Since the definition of cell ...
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### what are other metal oxide that can be used as electron acceptors?

I am using silver oxide as a cathode because it's common. I was reading that " some solid metal oxides (e.g., silver oxide, lead dioxide, and manganese dioxide) possess high redox potentials. ...
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### Deriving reduction potential from redox reactions

From a past USNCO test: 40. What is the standard reduction potential of $\ce{Hg^2+(aq)}$ to $\ce{Hg(l)}$? \begin{align} \ce{2 Hg^2+(aq) + 2 e- &-> Hg2^2+(aq)} &\quad E^\circ &= \pu{+0....
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### What parameters do you use to find the order in which elements will leave a solution during electrolysis?

I am looking to perform electrolysis on a molten solution of many elements, specifically a mix of iron, sodium, potassium, silicon, aluminum, and titanium oxides and chlorides. What I'm trying to ...
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### Electrode potential and likeliness to reduce/oxidize (electrolysis) [closed]

I'm a little confused about situations where multiple chemical compounds can be reduced/oxidized and the likelihood of this happening to one compound over the others, depending on the electrode ...
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### Is it the solution energy or the reduction potentials (or both) that drives a galvanic cell?

I have received conflicting explanations for why the redox reaction in a galvanic cell occurs. Explanation 1: Some say that it occurs because the anodic metal dissolves more easily than the cathodic ...
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### Reaction of Copper and concentrated sulphuric acid

We know that dilute $\ce{ H2SO4}$ doesn't react with copper because copper has higher reduction potential ($0.33$) as compared to hydrogen ($0.00$). However, it reacts with conc. $\ce{H2SO4}$ and ...
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### Does a change in oxidation number in a redox reaction mean that an actual electron transfer occured?

Oxidation numbers are fictitious charges that pretend the entire molecule is an ion i.e. it artificially localizes electrons onto atoms within a single molecule. In a redox reaction, we find that an ...
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### How can I convert cathodic energy efficiency to overall energy efficiency?

Im working on calculation which involve the energy efficiency of producing formate by CO2 electroreduction. I wonder how to convert the reported cathodic energy efficiency (71%) of papers e.g (1) this ...
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### How to calculate Energy Efficiency of electrochemical production

I'm trying to understand some basic electrochemistry as a non chemist and struggling to find the info online effectively. Its clear that energy efficiency = Energy(useful) / Energy (input). So, I know ...
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### Understanding Pourbaix diagram

I am recently taking courses in environmental chemistry and I was introduced to Pourbaix diagram. I was taught that the lines in the Pourbaix diagrams are equilibrium lines. Lets take as an example ...
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### Can water oxidize zinc?

According to this textbook, H₂O has lower reduction potential (-0.83 V) than Zn (-0.76 V). This mean zinc is unable to reduce water to hydroxide. If so, why this video demonstrate that by heating zinc ...