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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1answer
6k views

Why do sodium halides react so differently with sulfuric acid?

Why do sodium halides react so differently with sulfuric acid? \begin{align} \ce{NaF + H2SO4 &-> NaHSO4 + HF} \tag{1a}\label{NaF}\\ \ce{NaCl + H2SO4 &-> NaHSO4 + HCl} \tag{...
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1answer
678 views

Electrochemical Cell

Now in an electrochemical cell , we make use of the fact that whenever there is a potential drop , electrons will flow from lower to higher potential as for a potential drop , there must be an ...
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3answers
13k views

Please explain why dioxygen difluoride is so dangerous

I just read this article that mentioned that dioxygen difluoride is very dangerous. The terms it uses are "awful", "violently hideous" and "deeply alarming". But I couldn't get a handle on exactly ...
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0answers
144 views

Where do the rate laws for the Chlorine Dioxide-Iodine-Malonic Acid reaction come from?

After reading a section on this particular oscillatory reaction, something started bugging me about it. However, let me lay out the basis of my question. From what I've researched, Lengyel and ...
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2answers
3k views

Writing the net reaction for reaction of sodium hypochlorite with hydrochloric acid and potassium bromide

I am currently taking a general chemistry course and during a lab they had us do the following procedure: Place $\pu{2 mL}$ of $5\%$ $ \ce{NaClO} $ solution in a test tube. Add $10$ drops of ...
4
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1answer
167 views

In acidic solution, what does ClO₃⁻ reduce into?

In acidic solution, what does $\ce{ClO3-}$ reduce into and, most importantly, why? It's $$\ce{6e- +ClO_{3}^- +6H^+ -> Cl^- + 3 H_2O}.$$ Now, with the gift of foresight, why was the equation for ...
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1answer
6k views

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 ...
6
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2answers
168k views

What is the reaction between oxalic acid and potassium permanganate?

I've already searched online some information about this equation, but everywhere I read, there's also sulfuric acid, which we did not use in the laboratory. We only used potassium permanganate and ...
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What does the phrase “reducing atmosphere” mean in quantitative terms?

There is a debate about "how reducing" the atmosphere of the early Earth was, and this question is my attempt to grasp toward an understanding of what that that phrase really means. As a bit of ...
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3answers
8k views

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
18k views

Oxidation number of nitrogen in KCN

How can one determine the oxidation number of nitrogen in $\ce{KCN}$?
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2answers
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Balancing and combining the half equations in redox

I can understand redox equations of the following form, I break these down into half equations and combine them. $$\ce{MnO4^- + C2O4^{2-} -> Mn^{2+} + CO2}$$ Where I have issue is with the ...
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Why is salt needed when using vinegar to clean pennies?

Let's say you have a solution that is vinegar and it has salt (NaCl) dissolved in it. Then you place old dull pennies in it. Then you look at it 5 minutes later and the pennies are clean and looking ...
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572 views

Why do oxidation numbers work?

I understand that oxidation numbers are a method for keeping track of electrons in a reaction and how they are generally assigned (electrons in a bond are assigned to the more electronegative atom). ...
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2answers
985 views

How does 1,3-dichloro-1,3,5-triazinane-2,4,6-trione (dichloroisocyanuric acid) generate hypochlorous acid when dissolved in water?

Can someone draw the reaction that leads to the generation of HOCl when dichloroisocyanuric acid (structure shown below) is dissolved in water?
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1answer
559 views

Thiosulphate acidic decomposition

I just came across this reaction $\ce{Na2S2O3 + 2HCl -> 2NaCl + SO2 + S + H2O}$ I was wondering if it was possible to predict the products of this reaction if I didn't know it (or any inorganic ...
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1answer
14k views

Is combustion considered a redox reaction?

When carbon combusts with oxygen, is this considered a redox reaction since the oxygen atoms gain electrons and the carbon atoms lose them?
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1answer
316 views

What undergoes reduction in a zinc-copper voltaic cell?

In a $\pu{Zn-Cu}$ voltaic cell, the electrolyte is sodium chloride solution. The question was: In this cell, which of the following undergoes reduction? My answer was copper, but why is the exact ...
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2answers
2k views

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
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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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1answer
2k views

Which element is being reduced in this reaction?

Which element is reduced in this reaction: $$\ce{2KMnO_4 +3NaSO_3 +H_2O ->2MnO_2 +3NaSO_4 +2KOH}$$ I am trying to figure out which elements lose their electrons, but how am I supposed to know ...
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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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1answer
420 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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2answers
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Why must an oxidizer not touch rubber?

Why is it that oxidizers (specifically $\ce{KClO3}$) are at risk of causing a fire when they come into contact with the rubber stopper used to contain them in their container, but can be slowly heated ...
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2answers
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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 ...
5
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1answer
571 views

What does the reaction of chromium with ozone form?

I know almost nothing beyond 10th grade chemistry. I'm trying to name a web application, and was wondering what the products are of a reaction between the element Chromium and the gas Ozone (...
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2k views

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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2answers
1k views

What role does H2O2 have in copper (II) acetate formation?

Mixing solid copper, 5% vinegar, and hydrogen peroxide ($\ce{H2O2}$) causes copper acetate to form. The process will occur very slowly without hydrogen peroxide. Adding $\ce{H2O2}$ speeds the ...
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1answer
252 views

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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1answer
1k views

Flammability (NFPA) - how is it defined?

I was reading up on a wonderful little chemical compound known as chlorine trifluoride ($\ce{ClF3}$). For a primer, check out Dr. Derek Lowe's blog post here: Sand Won't Save You This Time. The title ...
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1answer
1k views

Oxidative chlorination mechanism (sulfide to sulfonyl chloride)

I cannot find much guidance in the literature. Any ideas as to what the mechanism of this reaction might be?
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1answer
3k views

How would I calculate the Normality of a 0.00167 molar solution of KIO₃?

I need a 0.01 N solution of $\ce{KIO3}$ to use as a standard in a Winkler titration. The protocol that I am using specifies that this is 0.3567 g L-1, which I have calculated to be 0.00167 M based on ...
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1answer
125 views

Do Na or Li need heat in order to react with Cl₂?

I've read how putting a burning piece of sodium in chlorine would produce white $\ce{NaCl}$ fumes. However, I can't find out whether Na or Li can react with $\ce{Cl2}$ without heating or burning.
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Why is nitric acid such a strong oxidizing agent?

In my teaching-lab experiments I've seen that nitric acid solutions are able to facilitate the dissolution of metals such as silver, even though they are more active than hydrogen. Does anyone know ...
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1answer
476 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 ...
19
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1answer
667 views

Why does benzene bend in this reaction?

From here I can see why hapticity changes here, but not why it is necessary for the benzene ring to bend. The resonance energy of benzene is pretty large, and there's no balancing increase in ...
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2answers
231 views

How to differentiate a metal from its ion? [closed]

I am working on metal and its ion. The problem is, I would like to know whether the metal has been converted to its ionic form or not. The hypothesis for the analysis is that metals are good ...
23
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2answers
341 views

What is a good method to measure the redox potential of a cellular system?

I know how to measure the concentration of free thiols, which is reflective of the redox-potential of cellular compartment such as the cytoplasm or a lysosomes. What other methods exist?

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