Redox is the portmanteau of reduction and oxidation and therefore refers to reactions in which electrons are transferred and in consequence the oxidation state of the involved elements changes.

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Why is Iron (Fe) difficult to reduce?

$\ce{Fe^3+ + e- -> Fe^2+} \quad +0.77$ $\ce{Fe^3+ + 3e- -> Fe} \quad -0.04$ $\ce{Fe^2+ + 2e- -> Fe} \quad -0.41$ $\ce{Zn^2+ + 2e- -> Zn} \quad -0.76$ $\ce{Co^2+ + 2e- -> Co} \quad ...
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Absorption Extinction Coefficient [on hold]

What affect would hydrogen peroxide have on the absorption extinction coefficient of the UV/Vis spectrum of a nanocluster (like {Mo$_{154}$})? I think it may have something to do with catalysis but ...
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Is there a convention as to what order to write reactants and products in a redox reaction?

When doing homework, it can be time-comsuming to check the answers in a redox reaction due to different order of the reactants and products. For example, while $$\ce{2MnO4- + 5Fe^2+ + 16H+ -> ...
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Confusion about the oxidation state of copper in copper cyanide redissolved with excess cyanide

$\ce{CuSO4}$ when reacts with $\ce{KCN}$ forms $\ce{CuCN}$ while it is insoluble in $\ce{H2O}$. It is soluble in excess of $\ce{KCN}$ due to the formation of the following complex: a) ...
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Explain the difference in stability of permanganate ions in acidic/ alkaline solutions?

The question is such: I know that the permanganate ion is more stable in alkaline solution than in acidic solution, as the more positive electrode potential in acidic solution means more negative ...
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16 views

reducing agents as products

how could hydrogen gas be considered a reducing agent when it's a product where it helped in forming $\ce{FeCl2}$ instead of $\ce{FeCl3}$? $$\ce{Fe + 2HCl -> FeCl2 + H2}$$
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34 views

Oxygen reduction - beginner level

I am embarrassed to ask but I don't get something really basic. When molecular oxygen and hydrogen react to produce water, we say the oxygen has been reduced and the hydrogen has been oxidised. ...
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29 views

How does salt concentration affect corrosion rate of iron?

I have conducted an experiment where I test the affect of $\ce{NaCl}$ concentration on corrosion rate of iron. I did this in an environment were all of the iron was submerged in water and the water ...
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22 views

Calculate redox potential and free energies based on structure of chemical molecules? [on hold]

How to do it? And are there any programmes or softwares can do such thing? For example, in metabolic networks, I can have the very basic structure of the chemicals. Then I want to calculate the free ...
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How does vinegar get rust off these coins

As experiment I found some really nasty rusty coins on the street. They were green. After looking on a website I found vinegar could eliminate the rust. It worked pretty well. I know this is a redox ...
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17 views

How long will it take for a measurable change in mass (corrosion) in an iron copper corrosion cell to happen?

I am planning to do an experiment, in which I will test the affect of salt concentration on corrosion rate. Would there be a relationship? How long would it take for rust to form, that could be ...
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18 views

Reduction at the cathode

I'm learning electrolysis and we learned that the positive ions go to the cathode which is where reduction takes place. However, I got confused because when you learn about ionic bonding, the positive ...
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36 views

Determine the oxidation number of Sulphur in SF6

I've juet started learning about redox chemistry and oxidation numbers. I can work out most of the oxidation number questions, but I dont know how to do this one. This is not an ionic compound, and ...
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37 views

What factors influence the resultant oxidation state of Fe in 3Ca(OH)2+2FeCL3?

$\ce{3Ca(OH)2 + 2FeCl3 -> 2Fe(OH)3 + 3CaCl2}$ What factors influence the resulting oxidation state in the iron hydroxide molecule in this reaction? Since iron's oxidation state ranges from +2 ...
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58 views

Stability of MnO4-

Why is the MnO4- more stable in basic than acidic conditions? I know that electrode potential values suggest this, but what is the underlying chemical explanation for the phenomenon?
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33 views

What is the Purpose of an Electrolyte in a Galvanic Cell?

I understand how a galvanic cell works and the purpose of erverything such as the ssalt bridge and the electrodes, however I don't understand why an electrolyte is required. For example, consider this ...
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16 views

Can oxidizing agents act as comburents?

Comburent, to the best of my knowledge, refer to substances that catalyze combustion reactions without reacting itself or being flammable independently, such as potassium chromate. How would oxidizing ...
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What are applications of the reaction between oxalic acid and potassium permanganate?

I did the following experiment in my science class and for our write up we have to apply the reaction of oxalic acid and potassium permanganate to real life situations. We chopped up carrot and ...
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How to make a corrosion cell?

I've read that in a corrosion occurs as a result of an electrochemistry. The iron oxides and acts as an anode, while carbon (present in Iron) acts as the cathode, but it is the oxidized water that ...
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53 views

How does Ba(IO)2 react with KHS (in neutral media) [closed]

$$\ce{Ba(IO)2 <=> Ba^2+ + 2IO^-}$$ $$\ce{KHS <=> K^+ + HS-}$$ $$\ce{HS^- <=> H^+ + S^2-}$$ What is the product?
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How to model a lead-acid battery without lead dioxide?

I don't have lead dioxide available to me and would like to carry out an experiment to see how the voltages changes when I change the concentration of the electrolyte. Since I can't make the lead-acid ...
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39 views

How to find out the coefficients in aCu + bHNO3 --> cCu (NO3)2 + dNO2 + eH2O? [closed]

$$\ce{a\,Cu + b\,HNO3 -> c\,Cu(NO3)2 + d\,NO2 + e\,H2O}$$ I was wondering how do I find the coefficents for the above reaction? In particular, the ratio between $\rm b:d.$
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Comparing two oxidizing agents using electron configuration

I'm being given the task to choose which oxidizing agent from the pair $K_2IrCl_6/K_2PtCl_6$ is the strongest and explain my answer using their electron configurations. We write the electron ...
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49 views

Why copper sulphate is a catalyst in this reaction

Recently, we learnt about catalyst is a substance can increase the rate of reaction without any without itself undergoing any permanent chemical change.The experiment we did was the reaction between ...
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How zerovalent Iron reacts with etylglycole?

In reaction of ethyl glycol and iron during anaerobic condition, on room temperature, reaction will not occur?
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How to solve such a redox equation without periodic table of elements?

I am given the following reaction: $$\ce{KClO3 + FeSO4 + H2SO4 -> Fe2(SO4)3 + KCl}$$ In order to solve this redox reaction I first of all I need to spot "the elements that changed". In order to ...
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45 views

How to determine the products of a redox reaction

I'm doing a paper on water treatment methods, and in one section, I'm describing how a nearby water treatment plant is removing Trichloroethylene ($\ce{C2HCl3}$) from water by oxidizing it using Ozone ...
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Half-equations for the combustion of sulfur dioxide

Given the following redox equation: $$\ce{2SO2(g) + O2(g) <=> 2SO3(g)}$$ $\ce{SO2}$ is being oxidized to $\ce{SO3}$ and $\ce{O2}$ is being reduced to $\ce{SO3}$. I figured a way to write the ...
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Why doesn't hydrogen displace metals from their oxides?

As I understand it, a displacement reaction is where a more reactive element kicks out a less reactive element from a compound. For example, chlorine is more reactive than iodine, so chlorine will ...
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Reagents that can oxidise iodide to iodine [closed]

Consider the following list of reagents: acidified $\ce{K2Cr2O7}$ alkaline $\ce{KMnO4}$ $\ce{CuSO4}$ $\ce{H2O2}$ $\ce{Cl2}$ $\ce{O3}$ $\ce{FeCl3}$ $\ce{HNO3}$ ...
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Reduced Graphene Oxide (RGO) Conductivity vs Everything Else

I had a question regarding, as you can see, 'Reduced Graphene Oxide'. Not many people are aware of this material since pristine 'graphene' gets all the attention. Reduced Graphene Oxide (RGO), is the ...
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70 views

Mechanism for oxidation of primary alcohol to carboxylic acid

My teacher told me that the following is the mechanism for oxidation of primary alcohols to carboxylic acids: $\ce{Primary~alcohol ...
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Why is the reaction between potassium permanganate and hydrogen peroxide spontaneous?

When hydrogen peroxide is mixed with potassium permanganate, oxygen gas and water vapour are formed, according to the reaction (source): $$\ce{2MnO4- + 3H2O2 -> 2MnO2 + 2H2O + 3O2 + 2OH-}$$ This ...
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What are all products of an ozonolysis of alkenes using zinc and water?

I'm studying ozonolysis reactions in alkenes, and saw that in one of them there is the formation of $\ce{H2O2}$ (Can anyone explain from where?) that I presumed that reacts with $\ce{Zn}$, one of the ...
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Breakdown of butyl rubber

I'm in my high school's theatre crew and of course we build a lot of props and such. However I just opened (yesterday) an old drawer of screwdrivers and they smelled like puke! I know that the ...
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What is the product of the reaction of carbon with sulfuric acid?

I don't know if $\ce{C}$ or $\ce{CuO}$ react with $\ce{H2SO4}$. Some sources say that: $$\ce{C + H2SO4 -> CO2 ^ + 2SO2 ^ + 2 H2O}$$ (It seems to be similar to $\ce{Cu}$ reactions with ...
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Determining Iron Content in Spinach from Titration

I used titration to find the mass of iron in a $5~\mathrm{g}$ sample of spinach after leaving the spinach to soak in tap water for 5 different amount of times. I added $\ce{H2SO4}$ to the solution and ...
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What is the difference between a reaction of Lewis acids with Lewis bases and a redox reaction?

For example I came across this equation: $\ce{2Al_{(s)} + 6HCl_{(aq)}} \longrightarrow \ce{2Al^{3+}_{(aq)} + 6Cl^{-}_{(aq)} + 3H_2_{(g)}}$ And thought this was a redox reaction but my book says it ...
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What is the chemical redox equation between hydrogen peroxide and melanin?

I am investigating hair bleach, and want to figure out the redox reaction between $\ce{H2O2}$ (hydrogen peroxide) and $\ce{C18H10N2O4}$ (melanin). $\ce{H2O2}$ is a strong oxidizing agent in this redox ...
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Disproportionation of hydrogen peroxide

Hydrogen peroxide is decomposed as follows: $$\ce{2H2O2 -> 2H2O +O2}$$ This is a disproportionation redox reaction of $\ce{H2O2}$ involving the 2 half reactions $$\ce{H2O2 -> O2 + 2H^+ + 2e-}$$ ...
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Experimenting with electrochromic prussian blue

I am attempting to preform this experiment. Chemistry isn't really my cup of tea, so I have a couple questions. The instructions say to provide 40µA per cm2, where does that number come from? The ...
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77 views

Acids generating nascent gas atoms

When sulfuric acid reacts with copper, then $\ce{H2SO4}$ gives nascent oxygen $\ce{[O]}$. The reaction is: $$\ce{H2SO4 -> H2O + SO2 + [O]}$$ This nascent oxygen reacts with copper to create ...
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How can you reduce Prussian blue without using liquid?

I have Prussian blue, iron(III) hexacyanoferrate(II), pigment suspended in oil, and I understand it is electrochromic; it changes from blue to colorless when Fe(III) is reduced to Fe(II). I've tried ...
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H2O2 + NaCl + H(+) reaction?

So I found these reduction potentials online: $$\begin{alignat}{2} \ce{H2O2 + 2H+ + 2e- \;&<=> 2H2O}\qquad &&E=1.78\ \mathrm V\\ \ce{2Cl- \;&<=> Cl2 + 2e-}\qquad ...
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In electrolysis, why is hydroxide oxidised in preference to anything(?) but halides?

In electrolysis of aqueous solutions, I can loosely explain what happens at the cathode in terms of reactivity - any metal more reactive than hydrogen stays in solution, effectively because they're ...
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Oxidation state of iron ions in a unit cell

Consider UC (unit cell) for a cubic ionic lattice containing 4 oxide ions - what is the avg oxidation state for Fe ions in this lattice? The four oxide ions create a -8 charge that must be ...
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35 views

Why does ozone reduce to oxygen?

The O's in ozone and in dioxygen all have oxidation states of 0. If this is the case, why is ozone considered to be reduced to form dioxygen (since there's no change in oxidation state)? Would the ...
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Difference between using Zinc Nitrate instead of Potassium Nitrate for Salt Bridge Solution?

I have a lab question which asks "Suppose that before you began this experiment you ran out of your salt bridge solution of Potassium Nitrate and the only substitute available was zinc nitrate, would ...
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Will Mg undergo a redox equation with Zn2+ or Cu2+?

Mg can do a redox reaction with $\ce{Cu^2+}$ as well as with $\ce{Zn^2+}$, since Mg has the lowest reduction potential $E_0$. (I am aware that a reaction may or may not be feasible as redox, and this ...
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Why is Fe2+ a reducing agent?

My Chemistry book says $\ce{Fe^2+}$ is a strong reducing agent. But I don't understand. Why? Shouldn't $\ce{Fe^2+}$ gain 2 electrons and increase the Oxidation number of another element (by giving ...