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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20 mg solid PbO2 is stirred at room temperature in 2 ml water for 10 minutes and filtered. Then KI is added [duplicate]

20 mg solid PbO2 is stirred at room temperature in 2 ml water for 10 minutes and filtered. What will happen if you treat the filtrate with aqueous KI solution? Mention the colour, state of the mixture ...
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Do ions tend to react with oxygen dissolved in water? [closed]

If a water solution contains no ions (other than H+/OH- from auto-ionization) or does contain ions (monovalent or divalent cations and anions), does it affect dissolved oxygen in any way? Can oxygen ...
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In a battery, what happens to LiCoO2 when the lithium leaves? It becomes CoO2?

What chemical compound exists at the cathode of a lithium-ion battery when the lithium is not there? The cathode is usually described as $\ce{LiCoO2}$, so does it become $\ce{CoO2}$? $\ce{CoO2}$ ...
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Balancing reactions algebraic method limitations [duplicate]

How do I balance this reaction using the algebraic method? Seems that the equation can't be solved. How do I balance such reaction and does the algebraic method has limitations and wont work for ...
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m-CPBA Selectivity between Baeyer Villiger Oxidation and Epoxidation?

If both a ketone and an alkene are present in a molecule and you add one equivalent of m-CPBA, what are the factors that determine which group will be oxidized, the ketone through Baeyer-Villiger ...
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Is reduction of copper oxide a combustion reaction?

Is the following reaction a combustion reaction or just a single displacement? Could be both? $$\ce{H2 + CuO -> Cu + H2O}$$ A friend of mine claims it is a combustion reaction because it is ...
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94 views

Reaction between halogens and concentrated nitric acid

I have read that the reaction between $\ce{I2}$ and conc. $\ce{HNO3}$ gives $\ce{HIO3}$ and $\ce{NO2},$ but there is no mention of the other halogens' products. Do they all give halous acids and ...
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70 views

What is the state of aggregation of iodine formed during electrolysis of molten nickel(II) iodide? [closed]

Assume the electrolysis of molten $\ce{NiI2(l)}$ (inert electrodes) in a cell. The cell with a heating element is in the room; the room is at $\pu{25 °C}$ and $\pu{101.3 kPa}.$ The half-reaction for ...
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1answer
51 views

Is the effect of hydroperoxyl radicals significant in the oxidation of organic compounds in the Fenton reaction? Why or why not?

In the Fenton reaction, a ferrous catalyst and hydrogen peroxide are used to generate hydroxyl radicals which in turn oxidise organic compounds. The reaction is commonly seen in the treatment of ...
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Why is chromate stable in basic medium and dichromate stable in acidic medium?

When I was studying the equilibrium existing between chromate and dichromate ions in the solution, I came to know that Chromate ion is more stable in basic medium while dichromate ion is stable in ...
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1answer
36 views

Which is a dye: Ferric Acetate or Ferrous Acetate?

I’ve been trying to make Iron Acetate to dye leather and I cannot, for the life of me, figure this out experimentally. I’ve been allowing steel wool to react with pure white vinegar in a sealed glass ...
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Effect of charge density on electrolysis of dilute sulphuric acid

I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen: $$\ce{2 HSO4- -> H2S2O8 +...
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Can aqua regia work 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 ...
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Are there acid/base processes in aqueous solution that are so slow that they are kinetically controlled?

This question came up in figuring out what the fundamental differences are between redox chemistry and acid/base chemistry (if any). In redox chemistry, strong oxidants and strong reductants can co-...
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In acid/base chemistry, are there amphoteric substances that undergo something that resembles disproportionation in redox chemistry

Some substances disproportionate. This means a species with an intermediate oxidation state yields two species with higher and lower oxidation state. For example: $$\ce{Hg2Cl2 -> Hg + HgCl2}$$ My ...
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1answer
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Limiting the minimum percentage of oxygen in atmosphere maintained by an oxygen absorber / scavenger?

I'm aware that oxygen in the atmosphere of a sealed package can be readily removed by using oxygen absorber/scavenger such as granulated iron and sodium chloride but my understanding is that these ...
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How does standard reduction potential state which of the two ions of an element is more stable?

In my book it is written that $\ce{Pb^2+}$ is more stable than $\ce{Pb^4+}$ and the reason was stated that as the reduction potential of $\ce{Pb^4+}$ becoming $\ce{Pb^2+}$ is $1.8$, whereas the ...
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3answers
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Predicting in which medium will the oxidation occur [closed]

The image above contains the redox half-reaction for Mn2+ oxidation and their standard electrode potentials. The first two are in base medium and the second two are in acid medium. How can I predict ...
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4answers
373 views

In NaCl electrolysis, why does chlorine ion get oxidized but not oxygen ion? [closed]

In $\ce{NaCl}$ electrolysis, on the positive electrode (aka. on the electrode where oxidation happens), $\ce{Cl-}$ ions were oxidized to $\ce{Cl2}$. But we don't see any $\ce{O^2-}$ at all. My pre-...
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2answers
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Copper acetate solution turning clear

I made a solution of copper acetate using 5% Acetic acid 3%hydrogen peroxide and copper wire and copper pipe and it had produced a blue solution of copper acetate. I left it over night to continue ...
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1answer
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What is the easiest way to concentrate a solution without causing it to hydrolyze?

I’ve been working with iron acetate solutions in dilute acetic acid (vinegar) and I’ve been running into a problem. Every time I try to boil off the solvent the solution hydrolyzes to form iron oxides....
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why is HClO a better oxidizing agent than HClO2, HClO3, HClO4? [duplicate]

Why do the oxoacids of chlorine have the following order of oxidizing power: HClO > HClO2 > HClO3 > HClO4 ? When I search it online, many posts say "because the oxidation state of Cl in HClO is the ...
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How should I think so as to discover the Half reaction method?

The ion electron method aka half reaction method. This method works amazingly in balancing out chemical equations. I have tried solving chemical equations algebraically, and it is the same, except ...
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Equilibrium cell potential question

In an attempt to wrap my head around the basics of electrochemistry I'm working my way through Wesley R. Browne's 'Electrochemistry' primer. With regards to the equilibrium potential of an ...
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Possible side reactions in electrolysis of concentrated NaCl

This is a very basic question about which side reactions can take place if the electrodes are not shielded from each other during electrolysis of concentrated $\ce{NaCl}$. So, this is the desired net ...
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Is my understanding of cyclic voltammetry correct? [closed]

So recently I've been roped into doing some CV and I'm trying to wrap my head around the fundamentals of the science behind it (and electrochemistry more generally! Bare in mind I'm very much not an ...
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Can pheophytin be converted back to chlorophyll?

Some fossil leaves are "greenish" when first exposed but rapidly darken to an "olive brown" color when they come into contact with air. If the fossil leaf contains pheophytin, can the addition of ...
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1answer
54 views

Is this galvanic cell representation right?

Question 13. In the galvanic cell: $$\ce{Pt(s) | I2(g) | I-(aq) || Fe^3+(aq) | Fe^2+(aq) | Pt(s)}$$ Representation of anode is incorrect and cell will not work. $[\ce{Fe^3+}] = [\ce{...
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Why does the corrosion of a steel nail develop iron ions in the ends of the nail and hydroxide in the middle of the nail?

We did an experiment in school where we put a steel nail in a solution consisting of: 1 g agar; 100 ml water; 100 ml indicator solution (which gets blue whenever $\ce{Fe^2+}$ is created and red when $...
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Industrial production of alkali metals

My professor says that $\ce{Li}$ and $\ce{Na}$ are produced by electrolysis, while $\ce{K, Rb}$, and $\ce{Cs}$ are made via the reaction $\ce{Na + MCl -> NaCl + M}$, where $\ce{M = K, Cs, Rb}$. I ...
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Calculation of the Halfcellpotential (equilibrium constant is missing the solvent water) [duplicate]

Suppose the following Rredox reaction of Br in Water: $BrO_3^-+6H^++6e^-\iff Br^-+3H_2O$ Next the text book claims the following about the corresponding equilibrium constant: $K=\frac{[Br]}{[BrO_3^...
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1answer
58 views

Reaction of 1,2-diketones with periodic acid [closed]

$\ce{HIO4}$ can oxidise alcohols. But does $\ce{HIO4}$ undergo any reaction/act as oxidant with 1,2-diketones?
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pH implications of redox balancing half reaction method

I have seen similar questions, but I’m asking a new question as far as I know. Why is water instead of hydroxide ions used to balance oxygen atoms in redox half equations? asks about using hydroxide ...
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1answer
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Is there any evidence, *any evidence at all*, that nascent hydrogen actually exists?

As far as I know, nascent hydrogen is nothing more than an especially magical unicorn entity that either makes reactions happen or at least greatly facilitates reactions happening. Many years ago, it ...
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4answers
491 views

If you placed silver metal into silver nitrate, would a reaction occur? [closed]

thinking about oxidation and reduction, what happens to the silver metal and the silver ions?
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2answers
60 views

Writing half equation confusion [closed]

The following is the answer for a question that I am doing: Reduction: $\ce{X^2+(aq) + 2 e- -> X(s)}$ Can I write $\ce{X + 2 e- -> X^2-}?$ Why can't I start with $\ce{X}$ instead of $\ce{X^2+...
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1answer
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Which is a better electrolyte for electroplating copper? [closed]

I need to know which is a better electrolyte to use when electroplating copper: copper sulfate or copper nitrate?
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Thermal reduction of other metal oxides beside Fe2O3

In the firing of ceramic glazes you can make an effect called oil spot. This is done by making two layers of glaze. A bottom layer rich in iron oxide (+15%) and a top white layer that's fairly ...
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How do the two half cells of Daniel cell know when they are connected?

I'm currently studying electrochemistry in school, and there is something I don't can't quite understand about Daniel cell. When you put $\ce{Zn}$ solid into $\ce{ZnSO4}$ solution, does the electrode ...
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1answer
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Equation for Galvanization and Electrolysis of Saltwater with Copper and Zinc

I am looking for the chemical equations for both the galvanization and electrolysis of saltwater utilizing copper and zinc. The closest I have gotten was from this site: Explanation for the reactions ...
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3answers
76 views

Balancing redox equations with oxygens in multiple oxidation states

How do you balance this using the ion-electron method; $\ce{CrO5 + H2SO4 -> Cr2(SO4)3 + H2O + O2}$ The oxygen has multiple oxidation states in $\ce{CrO5}$, and none of the sites I looked this up ...
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1answer
48 views

Electrode potentials vs interfacial potential differences

Between an electrode and an electrolyte there exists an interfacial potential difference. Many authors give the electrode potential to be the electric potential of the electrode relative to the ...
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1answer
118 views

Does the order of a written redox couple matter?

My understanding is that a redox couple is an unordered pair of two conjugate species. So we could speak of the redox couple consisting of $Ag$ and $Ag^+$; depending on whether a given redox couple is ...
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57 views

Most understandable notation for reduction and oxidation potentials

Nowadays a lot of electrochemistry is done using just electrode potentials (i.e. reduction potentials), so if in doubt the notation $E^o$ tends to imply a reduction potential. However, some chemists ...
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1answer
257 views

Why do we write electrode potentials next to chemical reactions? [closed]

We might have a half cell consisting of the redox couple $\ce{Ag+}/\ce{Ag}$, which for example's sake might be fixed to be at the cathode (i.e. undergoing reduction). The reaction at the cathode is ...
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33 views

Log(Q) is zero, therefore the effect of temperature change is unaccounted for by Nernst Equation?

I have an internal assessment on Nernst Equation. The experiment is seeing how changing temperature effects cell potential. The solution are zinc and copper sulfate with each having concentration of ...
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46 views

SO2 oxidation and Le Chatelier's Principle [duplicate]

From the following textbook by Brown, LeMay, Bursten, et. al., Chemistry the Central Science 14th Edition. I have the following question from Chapter 15 Chemical Equilibrium number 61. The basis of ...
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2answers
115 views

Why ZnS can be seen as making solution alkaline? Explain with reactions [closed]

There is an extract in my book which i am not able to get. It says: Place strip of metallic zinc in aqueous solution of copper nitrate for about one hour. You may notice that the strip becomes coated ...
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34 views

Blue bottle experiment turning yellow after being left alone

I conducted the blue bottle experiment, mixing glucose, sodium hydroxide and methylene blue and shaking to produce a blue colour, which turns colourless after a while due to the reduction of methylene ...
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2answers
93 views

Equations for the oxidation reactions of tea teaflavins and EGCG with potassium permanganate

For my chemistry investigation, I used Stamm's potassium permanganate method to investigate tea tannins with potassium permanganate to find the tannin content of teas. The method assumes complete ...

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