# Questions tagged [redox]

Redox is the portmanteau of reduction and oxidation. This tag should be used in questions where both the reduction and the oxidation process are under focus. This tag is not limited to inorganic chemistry. If the question is specifically about either reduction or oxidation (not both) of an organic compound, use [organic-reduction] or [organic-oxidation] instead.

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### How to calculate/estimate the contamination rate of ultra pure water (UPW) in the presence of metals?

Metals are known to release ions into ultra pure water. Do any equations or empirical data sets exist for estimating the rate of contamination with different metals? I don't need a specific solution; ...
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### Equilvalence point in redox Titration of Fe(II) and Fe(III) with Reinhardt-Zimmermann solution

In the lab at university, we need to conduct a simultaneous determination of iron(II) and iron (III) ions using potassium permanganate solution. In the first step, we just fill up our given sample ...
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### True or false: "A used AA battery contains fewer moles of electrons than a new AA battery."

I recently took a Gen. Chem. 2 exam that contained this question. I answered false, but my professor said the answer is true. My reasoning was that any electrons that leave the anode end up at the ...
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### The oxidation number of N and Cl in NOClO4 ​

My doubt is not about the solution itself, actually I was able to find the solution myself. We could split NOClO4 as (NO+) + (ClO4-) and then proceed, but here I "knew" this split. Is there ...
23 views

### Why does nitric acid react with less reactive metals [duplicate]

So we are studying the acid base chapter and I came across these reaction: $$\ce{3Ag + 4HNO3 -> 3AgNO3 + NO + 2H2O}$$ My question is, how can $\ce{Ag}$ react with $\ce{HNO3}$ as it is lower than ...
206 views

### Why do we need salt in a salt water battery?

I am having problems understanding why we do need salt added to the water to make this shown galvanic cell work. I understand that Zinc wants to dissolve into the electrolyte, resulting in $\ce{Zn^2+}$...
379 views

### Balancing complex redox reaction in a basic solution [closed]

I'm incredibly lost right now. I understand fully how to balance redox reactions in acidic/basic solutions, but the problem my teacher posted is not letting me use the method taught to us. I've ...
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### What reaction does happen when molten sodium hydroxide reacts with aluminium?

The reaction between aqueous sodium hydroxide and aluminium follows this equation: $$\ce{2NaOH + 2H2O + 2Al = 2NaAlO2 + 3H2}$$ But it's obviously not possible to balance this equation without the ...
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### Why is comproportionation thermodynamically favoured for the synthesis of Mn(acac)3?

I'm currently learning about ligands in school and I'm wondering why does comproportionation happen in the overall equation? There are fewer chemical species on the product side and the entropy of the ...
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### Where does the free electron from from in Ag/AgCl reaction?

For the Ag/AgCl half reaction, where did the free electron that AgCl captured come from? Did it come from the Ag wire? If so, why would Ag wire give an electron to AgCl, both atoms are Ag and have the ...
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### Why is addition of electronegative element to a substance considered as oxidation? [duplicate]

I'm confused to why oxidation with its other definitions also defined as addition of electronegative element to a substance, when at the same time in terms of electron transfer oxidation is also the ...
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### What role does ammonium play in the explosion of ammonium nitrate? [duplicate]

I read that ammonium is the "fuel" and nitrate is the "oxidizer". The nitrate oxidizes because it's a nitro group, but what's the mechanism of the ammonium?
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### Redox reaction of cycloheptatriene ligand

The reaction I really don't understand is the second one which produces the cycloheptatriene ring with a positive charge. The only thing I can think of is that the hydrogen is being ejected and ...
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### Why are holes appearing in this aluminum kitchen foil on my radiator?

I thought I would try to deal with dehumidified air from radiators by filling simple troughs of water placed on the top, which in theory would evaporate water as the radiator heated the air. I crafted ...
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### How can I prevent and remove oxidation on the surface of liquid Galinstan?

The oxide layer formed on galinstan (or its component of pure gallium) when exposed to air increases wetting and dulls the appearance. Is there a clear liquid material in which a blob of liquid ...
67 views

### How to balance this half-equations [closed]

HNO$_3 \rightarrow$ N$_2$O(g) I'm looking at the solution and it says that the above reaction can be modified as NO$_3^-$(aq) $\rightarrow$ N$_2$O (g) I don't understand why. Can someone please ...
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### Balancing redox reaction by removing spectator ion SO₄²¯ [closed]

I aimed to balance the equation $$\ce{Cr2O^{2-}_7 + FeSO4 + H+ -> Cr^{3+} + Fe2(SO4)3}$$ My teacher explained me that since $\ce{SO^{2-}_4}$ is the spectator ion, I must proceed in this equation ...
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### Fundamentally, what is the difference between redox and acid-base reactions?

For example, consider: $$\ce{NH3 + H2O -> NH4+ + OH-}$$ Here, the $\ce{NH3}$ is acting as a base (By Lewis theory, it is an electron pair donor). Why don't we consider this to be a redox (there is ...
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### How do I balance redox equations with three reactants?

Could anybody please explain me the concept of balancing redox reactions with three reactants? Either some solving steps or even the solution would be very appreciated. For example, I don't know how ...
43 views

### Does nascent Oxygen/Hydrogen really exist or just or is it just electron from ionic equation? [duplicate]

Recently I was taught by my teacher that there is no such thing as nascent oxygen neither hydrogen. It just represents Electrons from ionic equations. Then he proceeds to give example of following ...
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### How to derive formulas for n factor of different types of reactions?

While studying Redox reaction, I came across this term called n-factor which seems to me as a short-cut trick to do the questions quickly. Since I am preparing for a competitive exam so our chemistry ...
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### Reducing sugars and redox potential

I am wondering if reducing sugars are those that can act as reducing agents, and they act as such with Tollens and Fehling reaction, then what's the redox potential here? And is it a reversible ...
46 views

### Electrode potential of Br2/HBr half cell

I am wondering if it is possible to find the electrode potential of such a half cell: $$\ce{Br2 (l) + 2 e- <=> 2Br-(g)}$$ The standard electrode potential is for $\ce{Br-(aq)}.$ However, is it ...
68 views

### Oxygen-releasing material at ≤ 200 °C [closed]

I have to anneal a ceramic in high oxygen pressure, in an autoclave. For this purpose I need a chemical which can release oxygen at temperature less than or at 200 °C. Would appreciate any suggestion. ...
31 views

### Lithium Air vs Li Fluoride battery capacity [closed]

Lithium air aka lithium oxygen batteries are described as highest theoretical capacity battery possible. In wikipedia, it says lithium air has energy density 5210 Watt hour per kg, including weight of ...
111 views

### Extraction of copper from chalcopyrite

During the extraction of copper from chalcopyrite ore, the ore ($\ce{Cu2S.Fe2S3}$) is heated to form $\ce{Cu2S}$ and $\ce{FeS}$. Then during smelting it reacts with $\ce{O2}$ to form $\ce{Cu2O}$. Then ...
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### Do decomposition potentials change during electrolysis?

I was just wondering if decomposition potentials actually change during electrolysis. For example, if we reversed the Daniell cell reaction so that copper is oxidized, the half cell reactions would be:...
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### Etard's reaction

My textbook says the following on Etard's reaction: Now, if the alkyl group attached to benzene is an unsymmetrical or branched alkyl group, such as this: What will be the reaction product(s)? Which ...
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### what happens if iron clamp is attached to a copper pipe to a wall? [closed]

I'm guessing its not a good idea, since iron will then corrode easily (also depending on the location and environment), Although copper do not rust it will increase the rate of it from oxidizing. plus ...
43 views

### Sodium hydroxide reaction with manganese dioxide [duplicate]

I came across a website that said it is possible for sodium hydroxide to react with manganese dioxide at temperatures near 0 degrees Celsius. The reaction goes: 2MnO2 + 3NaOH ⇄ MnO(OH) + Na3MnO4 + H2O ...
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### Can hydrogen peroxide reduce ferric ion to ferrous ion?

I have studied that hydrogen peroxide always oxidizes ferrous ion to ferric ion (source of study : NCERT Chemistry Part II, Textbook for Class XI), but a question came in IIT JEE 2015 which states: ...
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### Is hydrogen peroxide a better oxidizing agent than chlorine gas? [closed]

If we compare the standard reduction potentials of $\ce{H_2O_2}$ with that of $\ce{Cl_2}$: $\ce{H_2O_2 + 2H^+ + 2e^- <=> 2H_2O : E^o = 1.78V}$ $\ce{Cl_2 + 2e^- <=> 2Cl^- : E^o = 1.36V}$ (...