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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6
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20k views

Why is the water reduction of oxygen favored in acidic conditions?

The standard reduction potential of diatomic oxygen in acidic conditions is +1.23 volts. However, the standard reduction potential of diatomic oxygen in basic conditions is only +0.40 volts. Why is ...
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3answers
5k views

Can redox reactions involve only non metals?

When non metal react they form molecule, and whether the bond is polar or not, the elements in the molecular compound will not have charges what so ever, because they are not ionic. But can non metals ...
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Balancing redox equation

So I had these two reactions that confused me .. I tried the standard way of balancing it (Putting oxygen number everywhere, +1,+2,-2 etc.) and then go on with it but it didn't work So anyways here ...
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What are the products for the redox reaction HCl + SnCl₂ + KMnO₄?

In the redox reaction, where $\ce{HCl}$ is the excess reactant do these reactions produce following half reactions? \begin{aligned} (1)&&\ce{SnCl2 &-> Sn^{4+} + 2e-}\\ (2)&&\ce{...
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358 views

Calculating Redox Potential; Coupled Reactions

For the reaction of silver and hydrochloric acid to form silver chloride: would the following be the correct way to couple the below two half reactions? $\ce{2Ag(s) + 2Cl^- ->2AgCl(s) + 2e^-} ~~E^...
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618 views

What exactly is the “oxygen reduction reaction”?

Is it $\ce{O2(g) + 4H^+(aq) + 4e^- \rightarrow 2H_2O(l)}$ and are there multiple types of ORR? See here for context: http://www.nature.com/srep/2014/140122/srep03821/full/srep03821.html
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192 views

Electrolysis of Strongly Basic Water

What happens when strongly basic water is electrolyzed? I know that the electrolysis of water in strongly acidic solution involves hydrogen protons; will these protons still be involved in strongly ...
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340 views

How does oxygen fight odors? (Deodorant ad)

I saw an ad on tv last night for Mitchum deodorant that showed big text on the screen that said "OXYGEN eliminates all odors!" or something similar. Their website indeed claims "Our exclusive formula ...
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Conjugate Theory and Redox

I'm trying to apply conjugate theory, which I can apply very well to acids/bases, to redox. Can you verify my logic, which I have broken down below? 1) I know that solid sodium is a strong reducer. ...
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126 views

Balancing Redox Equations

I was taught to balance redox equations with acid/base considerations. Instead of arbitrarily adding $\ce{H^+}$ and $\ce{HO^-}$ ions and memorizing separate rules for acidic and basic solutions, I was ...
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1answer
982 views

Does a patina on a knife prevent rust?

Before I begin, I think it's worth mentioning that I know little about chemistry and even less about knives. My question is this, having seen many people talk about how patinas work and the best ...
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What are the mechanisms for the reduction of organic compounds employing red phosphorus and iodine?

I was recently studying oxidation and reduction reactions. I found red phosphorus and iodine reduce many different organic compounds. Out of interest I would like to know the mechanism for these ...
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Mechanism of oxidation by dichlorotriazenetrione

How does dichlorotriazenetrione supply chlorine to a swimming pool and how does it oxidize organic material?
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Questions concerning redox reactions [closed]

What does it mean for an element to be reduced? What does it mean for an element to be oxidized? What is an oxidizing agent? What is a reducing agent? How do you identify oxidizing and reducing ...
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242 views

Confused with oxidation numbers

If -2 is a oxidation number and 2- is the charge, then what is - by itself, is it a oxidation number or charge? As in $\ce{Ag+}$. Also do you see $\ce{Cu + 2Ag+ -> Cu^{2+} + 2Ag}$ as a redox ...
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What is the oxidizing agent for Fe in the following redox reaction?

Redox: $\ce{Fe + 2HCl -> FeCl2 + H2}$ Oxidation: $\ce{Fe -> Fe^{2+} + 2e-}$ Reduction: $\ce{2H+ + 2e- -> H2}$ The $\ce{HCl}$ and $\ce{H2}$ are formed by covalent bonds. The $\ce{FeCl2}$ ...
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Which two substances react spontaneously?

Which two substances react spontaneously? (A) $\ce{Ag}$ and $\ce{Cu}$ (B) $\ce{Ag+}$ and $\ce{Cu}$ (C) $\ce{Ag}$ and $\ce{Cu^2+}$ (D) $\ce{Ag+}$ and $\ce{Cu^2+}$ $\tiny{\text{Taken from 2012 Chem ...
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332 views

what are reduction oxidation reactions?

in the picture, the product is a neutral material, but in the illustration of the molecular structure, the compound is shown in its ions, why we can't show it in its ions even in the equation or if we ...
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Would it be possible to produce a non-toxic atmosphere using a coal fire and frozen oxygen?

A Pail of Air is a classic science fiction short story by Fritz Leiber from 1951 describing how a family survives on an Earth that has left its orbit around the sun, using desparate low-tech methods: ...
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Can bromide ion reduce ferric ion?

Can bromide ion reduce ferric ion ? Just a query. In my opinion it can since bromide ion can undergo oxidation. Is my answer correct?
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1answer
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Why are more easily oxidized elements more reactive than less easily oxidized elements?

Why do the more easily oxidized elements displace the less easily oxidized elements? Question inspired by Activity Series of Metals
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Explaining redox reactions to a 6 year old?

In a similar vein and for pretty much the same reason as I post this question on the Physics.SE site, what would be a an effective means to promote understanding about redox reactions to a 6 year old? ...
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Electrolysis Anode equation

In the electrolysis of $\ce{Na2SO4}$, is it valid to write the anode half-reaction (oxidation) as $$ \ce{OH-} \rightarrow \ce{H+} + \frac{1}{2}\ce{O2} + 2\ce{e-} $$? My book says it's $$ \ce{H2O} \...
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Why is it hard to reduce titanium dioxide?

Titanium is expensive, although it is not rare and titanium dioxide is a ubiquitous component, it's part of such mundane articles as toothpaste, paper or plastics. The reason for that is that the ...
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Are these two reactions equivalent?

I'm supposed to balance a redox equation. I arrive at $$ \ce{H2O} + \ce{NH4+} + 2\ce{S^{2-}} + \ce{O2} \rightarrow \ce{NH3} + 2\ce{S} + 3\ce{OH-} $$ The "official" solution is $$ 4 \ce{NH4+} + 2\ce{...
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Can a battery powered by iron and air really provide a feasible power source for automobiles?

I'm referring to the Shuttle Battery recently announced (read more on it here) that suggests that: The energy density of the device is up to 7,700 Wh/L. It is more than 5 times higher than state-...
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1answer
333 views

Is it true that iron (Fe 0+) cannot exist when there's water around? [closed]

So somebody told me that iron metal (zero charge) cannot exist at all when $\ce{H2O}$ is present because it will all turn into rust. How is this possible? Isn't there some sort of equilibrium? Does it ...
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Why does Chloride attack CrO?

In certain applications some sorts of stainless steel (V2A, 1.4301) corrode when exposed to $\small{\ce{Cl^-}}$ in water, or at least it is strongly advised to use ...
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1answer
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Vertical lines in a Pourbaix Diagram

I know that because of the absence of the hydrogen ions in a reaction ($n_{H+} = 0 $) , the correspondent E-ph line have to be horizental , but what exactly the types of reactions (if there is) that ...
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What's the technical term for supercharging an acid with an oxidizer? And does it always work?

In a recent Mythbusters episode, where they tested some Breaking Bad chemistry assertions, they debunked the hydrofluoric acid body-dissolving myth referenced elsewhere in Chemistry.SE in the question ...
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Is there an alternative to the half-reaction method to solving red-ox reactions?

The equation for the reaction between a permanganate and iron(II) ions in acidic solution is: $\text{MnO}_4^- + \text{Fe}^{2+} \longrightarrow \text{Fe}^{3+} + \text{Mn}^{2+}$ My book, as well as a ...
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Electrode potentials at interfaces?

My questions relates to the fundamental concept of electrochemistry, more specifically the electrode potentials. 1) First, why is there a potential difference at the interface of two phases? ...
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Reaction of an electrode

Why is the cathodic reaction of $I^-/AgI/Ag$ is $$\ce{AgI + e- -> Ag + I-}$$ but not, $$\ce{Ag+ + e- -> Ag }$$ whereas, in $Ag/AgCl(s)$, $KCl$(0.2M); it is $$\ce{Ag+ + e- -> Ag}$$
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0answers
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Reduction by thermionic electrons

Certain reduction reactions require electrons as reducing agents. Is the overlapping of orbitals is necessary for electron transfer? I mean if a element $\ce{X}$ is heated and it gives out thermionic ...
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3answers
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What is an oxidizer?

When talking about gaseous fuel / oxidizer mixture what does one mean by oxidizer if there is no oxygen involved? Is it correct to think of oxidizer as the more electronegative specie, because it is ...
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2answers
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If a sugar is nonreducing, does that mean it doesn't ionize in water?

I'm thinking of sucrose, which I learned is nonreducing, what I take to mean it doesn't accept/take electrons from the surrounding solution. Does this also mean that it doesn't ionize and thus has a ...
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1answer
176 views

Are redox half-reactions “real”?

Are the half-reactions used in analyzing redox reactions a real thing or are they a conceptual shortcut? Is there a way to, however briefly, run a half-reaction by itself without the corresponding ...
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422 views

How does hot tub “shock” work?

Hot tub shock is potassium peroxymonosulfate. When added to a hot tub, it creates bubbles. It is said to oxidize organic debris in the water. What is the reaction?
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Why is mercury a “fancy proton”?

I remember that one of my old organic chemistry profs referred to mercury as being a "fancy proton". I think it was in the context of oxymercuration reduction. What might have been his rationale for ...
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477 views

What is the timescale of disulfide bond formation?

What is the timescale of disulfide bond formation in a given protein? What influences it? Finally, how does one actually measure it? From what I understand, the reduction and oxidation of bonds ...

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