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.

Filter by
Sorted by
Tagged with
2
votes
1answer
68 views

What is the reaction that takes place in the cathode of a Mg-Fe electrochemical cell?

Setup A magnesium electrode dipped in a magnesium sulfate solution and an iron electrode dipped into iron (III) sulfate solution Am I right in thinking that you need to first identify the redox ...
0
votes
1answer
2k views

How to calculate the volume of oxygen in a reaction between hydrogen peroxide and bleach using this apparatus

I know that the reaction between bleach and hydrogen peroxide produces oxygen but using this apparatus and information, I need to state how to calculate the volume of oxygen released: At the start of ...
2
votes
0answers
40 views

Is hydrogen peroxide a better oxidizing agent than chlorine gas?

If we compare the standard reduction potentials of $\ce{H_2O_2}$ with that of $\ce{Cl_2}$: $\ce{H_2O_2 + 2H^+ + 2e^- <=> 2H_2O : E^o = 1.78V}$ $\ce{Cl_2 + 2e^- <=> 2Cl^- : E^o = 1.36V}$ (...
1
vote
0answers
24 views

Why does the application of external mechanical pressure increase the performance of lithium-ion batteries?

Many electric vehicle batteries - specifically lithium-ion ones considered for this query - can be subjected to external mechanical pressure because it increases battery performance. What components ...
20
votes
5answers
16k views

Iron chemistry: acetates for ebonizing wood

I have recently been “brewing” what is commonly called “iron acetate” for ebonizing wood, and I'd like to understand the chemistry of the iron/acetic acid reaction, which should be fairly simple, but ...
11
votes
2answers
10k views

Equivalent weight in case of disproportionation reaction

We all know that $\text{Equivalent weight} = \frac{\text{Molecular weight}}{\text{n-factor}}$ However consider a reaction like: $\ce{Br2 + OH- -> Br- + BrO3- + H2O}$ where oxidation numbers of $\...
0
votes
0answers
18 views

Why do we need salt bridge in a cell during potentiometric measurement as there is no or minimum redox activity at electrodes?

In electrochemical cell, we need salt bridge to maintain electrical neutrility in both halves cells during redox reaction?. But in during potentiometric measurement, no or minimum current is drawn and ...
-1
votes
0answers
25 views

Water electrolysis [closed]

What happens when the power source is cut off from the electrodes? Do the electrons that travelled from the anode to cathode return back to the anode? Are the electrodes re-usable?
2
votes
1answer
175 views

How is indigo carmine used in Lowenthal-Permanganate titration as a redox indicator?

In a Lowenthal-Permanganate titration, cider tannins are quantified by titrating the cider with indigo carmine indicator and sulfuric acid against potassium permanganate. Tannins are antioxidants, so ...
-4
votes
0answers
28 views

Which one is anode Zn(II) or P(III) in a Galvanic cell with Zn and P electrodes? [closed]

A galvanic cell consist of one half-cell with zinc metal immersed in $\pu{1.0 M}$ $\ce{Zn^2+}$ solution and another half cell with $\ce{P}$ metal immersed in $\pu{1.0 M}$ $\ce{P^{3+}}$ solution. The ...
0
votes
1answer
2k views

Hydrogen peroxide and glycerol combination

Is the mixing of store-grade hydrogen peroxide 3% and glycerol in the ratio of 1:2 (V/V) at room temperature affecting the decomposition rate of hydrogen peroxide?
1
vote
2answers
48 views

Can you discriminate a monooxygenase from other enzymatic mechanisms by the requirement of NADPH?

I am working on a project about CYPs 450. It seems that most of them function as monooxygenases but there are other categories as well. Assuming that the question makes sense, is it correct to say ...
0
votes
3answers
91 views

How does copper oxidise alcohols?

Consider for example ethanol being heated in the presence of copper at 300 °C. How does it give ethanal as a product? Copper being in its elemental state (oxidation state 0). Since negative oxidation ...
4
votes
2answers
26k views

Why is maltose a reducing sugar but not sucrose, even though they're both disaccharides?

I came across this on Wikipedia: Many disaccharides, like cellobiose, lactose and maltose, also have a reducing form, as one of the two units may have an open-chain form with an aldehyde group. ...
3
votes
2answers
4k views

Why is nitric acid a stronger oxidising agent than sulfuric acid? [duplicate]

We were taught that nitric acid can oxidize $\ce{Cl-}$ to $\ce{Cl2}$, but sulfuric acid cannot. Is this due to its smaller size, or structure, or what?
15
votes
4answers
17k views

Why is HNO3 a stronger oxidising agent than H3PO4?

Why is $\ce{HNO3}$ a stronger oxidising agent than $\ce{H3PO4}$? $\ce{N}$ and $\ce{P}$ have the same oxidation number. Is it the electronegativity difference between $\ce{N}$ and $\ce{P}$?
1
vote
1answer
55 views

Hydrogen Peroxide & Vinegar Film reversal, can someone help me understand this reaction?

I'm interested in DIY photo development and I came across a reversal process that uses chemicals easily available at the grocery store. The purpose of a reversal process is to take a partially ...
7
votes
3answers
12k views

Does DIBAL-H reduce carboxylic acids?

Diisobutylaluminium hydride(DIBAL-H) reduces only carboxylic acid, ester or both? The answer given was that it only reduces ester. Is it correct that under any condition carboxylic acids are not ...
0
votes
1answer
79 views

What is the n-factor of ferric sulfide when it reacts with oxygen to give ferrous sulfate and sulfur dioxide?

What is the n-factor of $\ce{Fe2S3}$ in this reaction? $$\ce{Fe2S3 + O2 -> FeSO4 + SO2}$$ I broke this reaction down into two parts $$\ce{Fe2S3 -> FeSO4}$$ $$\ce{Fe2S3 -> 3 SO2}$$ And in the ...
9
votes
4answers
13k views

Why can we disregard stoichiometric coefficients when computing reduction potentials?

A $\ce{Cr(s) | Cr^3+ || Cd^2+ | Cd(s)}$ galvanic cell has redox half reactions: $$ \begin{align} \ce{Cd^2+ + 2e- &-> Cd(s)} &\quad E^\circ &= \pu{-0.4 V}\tag{R1}\\ \ce{Cr^3+ + 3e- &-...
9
votes
1answer
2k views

How can AuCl3 exist?

The reduction potential for $\ce{Au^3+ + 3e- -> Au}$ is $1.503 \text{ V}$. The reduction potential of $\ce{Cl2 + 2e- -> 2Cl-}$ is $1.36 \text{ V}$. So, the $E^o$ for $\ce{2Au^3+ + 6Cl- -> 2Au ...
3
votes
1answer
172 views

Procedure for measuring EC

Most of the procedures on the internet are of a university research lab level. Is there a simpler method I could use to determine the concentration of EGCG
0
votes
1answer
1k views

Why does iodine get oxidized to iodic acid and not periodic acid by nitric acid?

Nitric acid oxidizes iodine to iodic acid, $\ce{HIO3}$ and not periodic acid, $\ce{HIO4}$, which is of a higher oxidation state. This happens although other nonmetals are oxidized to their highest ...
5
votes
2answers
645 views

The spontaneity of a redox reaction

Suppose we have a redox reaction and we want to see in what direction the reaction is spontaneous. We do this by comparing the standard reduction potentials of the sub-reactions available in the main ...
-2
votes
0answers
24 views

What is really 'n factor' and equivalent concept is? [duplicate]

I can't understand from where does equivalent concept came and how it works. What are we doing while calculating n-factor , what does it signify? Please make me understand this...
0
votes
1answer
42 views

How is this reaction not a decomposition reaction? And are all disproportionation reactions decomposition reactions?

When I asked my teacher whether all disproportionation reactions are decomposition reactions, he stated the following reaction: $$ \ce{4 KClO3 -> 3 KClO4 + KCl} $$ and said that this isn't a ...
0
votes
0answers
44 views

What are the half-cell redox reactions of water in different pH solutions?

While reading about the electrolysis of aqueous sodium chloride solution, I realized that the half-cell reactions depend on the pH of the solution. According to my understanding, the following ...
-5
votes
1answer
70 views

Explanation of rusting of iron through metallic bonding [closed]

1 ) [O - oxygen atoms , red dots - electron ] Explaining rusting of iron due to metallic bonding. So , here delocalisation of electron happens between Fe and Fe atoms. After some time , there is ...
3
votes
0answers
43 views

Oxidising power of oxides of 15th group elements [closed]

In case of oxides of 15th group elements in form of $\ce{M2O3}$ ($\ce{M}$ is the 15th group element), does oxidising power of oxides increase or decrease down the group? I tried to check by comparing ...
8
votes
2answers
564 views

Can aqua regia/royal water be produced with sources of chloride and nitrate other than hydrochloric acid and nitric acid?

According to Professor Poliakov and a question on Chemistry Stackexchange here, gold dissolves in aqua regia because the nitrate ion oxidizes the gold into $\ce{Au^3+}$, and the chloride bonds to the ...
1
vote
0answers
38 views

What does the horizontal axis on cyclic voltammograms mean?

In cyclic voltammograms (like the one in the attached image) what exactly is the horizontal axis' voltage refering to? Is it the measured voltage between the reference electrode and working electrode? ...
0
votes
2answers
100 views

Are all hydrolysis reactions non-redox reactions? [closed]

Are all hydrolysis reactions always non redox reactions? For example: $$\ce{N2O3 + 2H2O -> 2HNO2}$$ The main reason I say that this statement is correct is because oxygen and hydrogen generally ...
5
votes
0answers
69 views

Mechanism for reaction between carboxylic acid and manganese(II) oxide [closed]

I am reading about redox reactions of carboxylic acids with $\ce{MnO}$ but I couldn't find any mechanism online,so can any one provide the mechanism.
2
votes
3answers
513 views

How to balance this redox reaction

How to balance this redox reaction (using half reaction method): $$\ce{Cu + HNO3 -> Cu(NO3)2 + NO + NO2 + H^2O}$$ My attempt: $$\ce{Cu -> Cu(NO3)2 + 2e-}$$ $$\ce{3e- + HNO3 -> NO}$$ $$\...
1
vote
1answer
145 views

Finding moles of different compounds using balancing

$$\ce{K2Cr2O7 + $x$\,H2SO4 + $y$\,SO2 -> Cr2(SO4)3 + K2SO4 + $z$\,H2O}$$ For $\ce{Cr}$ change in oxidation number is: $+12$ becomes $+6$ For $\ce{S}$ change in oxidation number is: $+4y$ becomes ...
1
vote
4answers
470 views

Balancing the oxidative decomposition of FeS2

Doing some practice for the GRE next year. Please could you look at my working for this and tell me why I'm wrong? $$\ce{? FeS2 + ? O2 + ? H2O = ? Fe(OH)3 + ? H2SO4}$$ My working so far is: There ...
1
vote
2answers
4k views

Balancing a REDOX reaction using the oxidation number method, in acidic solution

I am trying to balance the REDOX equation shown below, but I got stuck after balancing the major atoms. Where can I go from here? I know I need to balance the H and O atoms, and make sure the charges ...
1
vote
2answers
6k views

Balancing the redox reaction

Question: Balance the following redox reaction: $$\ce{FeS2 + O2 -> Fe2O3 + SO2}$$ My Efforts: I tried balancing with oxidation number method. First of all i determined the oxidation state as ...
1
vote
1answer
4k views

Balancing a redox reaction with only one product

Consider the following comproportionation reaction: $$\ce{NH4NO3 -> N2}$$ How would I go about balancing this using the half reaction/ion-electron method?
2
votes
1answer
99 views

How to balance the reaction equation between copper (I) sulfide and nitric acid?

What is the sum of stoichiometric coefficients of redox reaction: $\ce{Cu2S + HNO3 -> S + NO2 + Cu(NO3)2 + H2O}$? This exercise is from a multiple choice exam. I have balanced the equation: $$\ce{...
2
votes
1answer
1k views

Disproportionation Reactions of the Halogens: Writing balanced net ionic equations for four reactions. See details

I first conducted the following reactions, each in separate test tubes: $\ce{NaBr}$ + $\ce{H2SO4}$ + $\ce{NaBrO3}$ $\ce{KI}$ + $\ce{H2SO4}$ + $\ce{KIO3}$ ...with water and dichloroethane added to ...
1
vote
1answer
39 views

Effect of side reactions on galvanic cell using iron rod as anode and sodium chloride as salt bridge

We just made a galvanic cell on a chemistry lesson using iron, iron sulfate , copper and copper sulfate. We used a sponge soaked in $\ce{NaCl}$ solution as the salt bridge. The issue is that we ...
-2
votes
1answer
37 views

What product is created in a zinc - nitrate reaction? [closed]

Question: Place 2 mL of Nitric acid in a test tube and add a small piece of Zinc turning I thought that the overall net ionic equation would be: $$\ce{Zn + 2H+ -> Zn^2+ + H2}$$ Is this correct? ...
8
votes
1answer
6k views

Why is in the reaction of cyclic unsaturated aldehydes with hydrazine and hydrogen peroxide the aldehyde preserved?

Question What is the product of this reaction? The answer given: At first, I thought this was a typical Wolff-Kishner reduction, but then I saw the reagents didn't match up (no $\ce{OH-}$...
2
votes
1answer
34 views

Oxidizing properties of sulfuric acid: can it oxidize hydrochloric acid to chlorine?

Can $\ce{H2SO4}$ oxidize $\ce{HCl}$ to $\ce{Cl2}$? I know that $\ce{KMnO4}$ can do it, but my question is considering $\ce{H2SO4}$. In sulfuric acid, sulphur is in +6 oxidation state and in $\ce{KMnO4}...
2
votes
2answers
2k views

Average Oxidation State - Utility?

What is the purpose of calculating an average oxidation state for a certain element in a compound? Hence the “average oxidation state” of carbon in acetic acid is 0. And the oxidation state ...
2
votes
1answer
6k views

How does iron rust in basic conditions?

I performed an experiment about the corrosion of iron. I used acid and base in the experiment. I understand that the acid speeds up the corrosion of iron. But I don't understand why the base also ...
0
votes
0answers
25 views

Temperature at which the reaction Oxalic acid + KMnO4 becomes autocatalytic

As described many times, the reaction between oxalic acid and potassium permanganate can be autocatalytic due to the production of Manganese ions. I've read that this only occurs at higher ...
6
votes
1answer
103k views

Half equations for H2O2 for its reducing and oxidising nature in acidic and alkaline medium

Is there a complete list of all the half equations for $\ce{H2O2}$ - both oxidation and reduction, in acidic and alkaline conditions? I've looked on the internet but can't seem to find a list with all ...
5
votes
2answers
2k views

Are there stronger oxidizing agents than fluorine gas?

Are there stronger oxidizing agents than fluorine gas, so it could oxidize fluoride to fluorine? Also, in case of oxygen, fluorine gas can oxidize oxygen gas to the exotic dioxygenyl ion. Can ...

1
2 3 4 5
26