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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Confusions about oxidation and reduction

My teacher told me that elements get oxidised when: 1)There is a loss of electron 2) There is an addition of oxygen 3)There is a loss of hydrogen And that they get reduced when: 1)There is a gain ...
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Balance redox reaction by oxidation method

How to balance chemical reactions through oxidation method.. I know all the steps except for the part where u b Adjust the coefficients to balance the electrons. I don't know how to do that.. I don't ...
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15 views

standardization of sodium thiosulfate using potussium dichromate

in this process first we need to liberate iodine to react with sodium thiosulfate.so first in an iodate free potussium iodide solution I have to add sodium bicarbonate,shake well until the salts ...
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16 views

Iron/Iron(III) Concentration Cell

From what I understand about concentration cells - which I never learned about when I took general chemistry - they rely on the fact that if we have differing concentrations of some solute separated ...
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8 views

Calculating Ksp from electrochemical data

I am fine with all the calculations on this page: http://www.chemteam.info/Equilibrium/Calc-Ksp-from-cell-potential-values.html However, why is $\ce{E_{cell}}$ set to zero? Is it because finding ...
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1answer
24 views

Spontaneous reaction between chromium(III) and aluminum

I'm trying to rationalize this problem. It's been a while since I've done redox problems. So here goes, and any input would be great. Basically - am I right? Here is what happens when you store ...
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24 views

Calculating cell potential

First of all, is the problem even worded correctly? From how the problem is worded, it seems that copper is being oxidized as well as iodide ion. This is what I am taught: Second of all, I'm not ...
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32 views

Can compounds (or only elements) be referred to as oxidising and reducing agents?

In the reaction $$\ce{3CuO (s) + 2NH3 (aq) <=> N2(g) + 3H2O(l) + 3Cu(s)}$$ the oxidation number of $\ce{Cu}$ goes from +2 in the reactant side to 0 in the products, and so it is reduced. The ...
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19 views

Half equations : when is the product a compound and when is it 2 ions?

When finding the half equation and overall redox equation for the following: a) $$\ce{Fe^2+(aq) + Cl2(g) <=>}$$ b) $$\ce{N2(g) + H2(g) <=>}$$ The solution from the textbook is ...
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Why don't everyday things burn?

Ok, so I learned about the equilibrium constant. Now, I've seen that the equilibrium constant of burning is extremely small $(K \ll 1)$. here, I have a question. you see, $K$ is still NOT 0, which ...
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32 views

Why is sodium bisulfite needed in syn-dihydroxylation?

On the reaction of syn-dihydroxylation with stoichiometric quantities of OsO4 (not a catalytic amount) the second step is $\ce{NaHSO3/H2O}$ or $\ce{Na2SO3/H2O}$. According to my understanding, $\ce{...
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53 views

Oxidation of acetone using SeO2

I was trying to look-up the mechanism of reaction of organic compounds with SeO2, but I am not able to understand it. I would really appreciate if someone can predict the end product with the ...
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19 views

Reduction of telluric acid

I want to form telluride ions to make $\ce{CdTe}$ dots so I am planning to reduce $\ce{Te(OH)6}$ using sodium borohydride. Is telluric acid sensitive to air oxidation? I read in a paper where they ...
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1answer
30 views

Water side-reactions in organic electrochemistry (redux) [closed]

(note: this is a reposting of part of my original post which I was told had too many questions in one post) Please bear with me as I am a chemistry newbie, but I am autistic and have recently ...
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26 views

Water side reactions in organic electrochemistry [on hold]

Please bear with me as I am a chemistry newbie, but I am autistic and have recently developed a fixation on electrosynthesis and must understand it. I'm interested in split reaction systems, where a ...
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2answers
46 views

Will SnO2 or SnO form from this reaction?

I have two possible chemical equations for a reaction between $\ce{SnCl2}$ and $\ce{H2O}$. The first one is: $$\ce{2SnCl2 + 2H2O +O2 -> 2SnO2 + 4HCl}$$ where the reaction draws on oxygen from the ...
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26 views

Can a more electropositive metal replaced by a less electropositive one?

I read from this reference that rubidium is extracted by reduction of its chloride with calcium or sodium. How is it possible?. Their electronegativities are much higher than rubidium. I think ...
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41 views

Are there stronger oxidation agent than fluorine gas?

Are there stronger oxidation agent 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 anything ...
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17 views

Balancing by oxidation numbers method multiple atoms

In my Chemistry textbook, the rules for balancing a chemical equation using the Oxidation-Number method are as follows: Assign oxidation numbers to all atoms in the equation. Identify the atoms that ...
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39 views

Metaphosphoric acid and water in cold

Consider this redox reaction: $$\ce{3PCl3 + 2HNO3 (conc.) + 5H2O → 2NO + 3[HPO3] + 9HCl}$$ The metaphosphoric acid is taken in square brackets, because I have doubts about it. As I know, this ...
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118 views

Sodium permanganate from manganese dioxide and sodium hypochlorite

This page states that sodium permanganate can be formed by the reaction of manganese dioxide with sodium hypochlorite and sodium hydroxide: $$\ce{2 MnO2 + 3 NaClO + 2 NaOH -> 2 NaMnO4 + 3 NaCl + ...
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Amide from acyl azide

There are several reports of synthesis of amines from acyl azides via Staudinger reaction with triphenylphosphine. Are there any reports of Staudinger reactions of acyl azides to amides? If not, are ...
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41 views

Redox: Oxidation and Reduction

I don't get the difference between Gain or Loss Electrons in a reaction and Changes in Oxidation State. Based on my notes and some research, Gain or Loss of Electrons A substance is oxidised if it ...
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31 views

Balancing using oxidation numbers

For the reaction KCl + MnO2 + H2SO4 -> K2SO4 + MnSO4 + Cl2 + H2O I have Mn going under oxidation from +4 to +2 I have Cl going under reduction from -1 to 0 Then after using my teachers method o ...
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60 views

Why the products of combustion of Cu2S are Cu2O and SO2?

$$\ce{Cu2S + 2 O2 -> 2 CuO + SO2}$$ Why are not these oxides $\ce{Cu2O}$, $\ce{SO}$ or $\ce{SO3}$? Is it connected to the stability of these molecules?
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49 views

How to determine the percentage of iron(II) and iron(III) in a solution?

Outline a plan of an experiment to determine the percentage of iron present as iron(III) in a solution containing $\ce{Fe^3+(aq)}$ and $\ce{Fe^2+(aq)}$ ions. You are provided with zinc, a standard ...
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91 views

Would consuming the Belousov-Zhabotinsky reaction be dangerous? [closed]

I'm wondering if the chemicals involved in the Belousov-Zhabotinsky reaction would be at all poisonous. If at all, do you know of another similar oscillating reaction that could safely be ingested? [...
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123 views

How does chromium(III) react to form chromium(VI) with hydrogen peroxide?

$$\ce{2Cr(OH)3 + 4NaOH + 3H2O2 -> 2Na2CrO4 + 8H2O}$$ How does this reaction occur? We suddenly get sodium chromate in the place of chromium hydroxide. I can't understand it. We mix two hydroxides ...
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17 views

Reverse single replacement reaction

Is it possible using electrochemistry or some other method to reverse a typical single replacement reaction to go in the opposite direction. For example, is it possible to take silver metal and ...
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56 views

Building a Voltaic Cell Without Metal Ions

For an assignment in my Chemistry class we have to build a voltaic cell using materials that are provided to us and that outputs a voltage as close to 0.8v as possible. The list of materials is as ...
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12 views

Electron balance for biomass synthesis

I'm studying for my exam and I came across these notes written by the professor himself. He's talking about the general reaction of biomass production in a bioreactor (not balanced): $$ \ce{C6H12O6 + ...
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141 views

Can silver metal be used to electrochemically reduce copper?

I have a solution of copper(II) ions and several cations. I am trying to reduce the copper ions to copper metal with electricity. My Ideas was to use silver as the anode and a copper wire as the ...
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20 views

What is the logic behind the ion electron method of balancing redox reactions?

The ion electron method is a.k.a the half reaction method. How are we just allowed to add electrons and protons and water molecules? Why does it work anyway?
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112 views

Reaction between manganese oxide (IV) and sulfuric acid

$$\ce{2MnO_2 + 2H_2SO_4 \rightarrow 2MnSO_4 + O_2\uparrow + 2H_2O}$$ How does this reaction occur? We get the oxygen moiety of the manganese dioxide suddenly oxidized to gaseous oxygen, while the ...
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36 views

Can hydrogen gas reduce copper(II) ion?

I have a solution of copper(II) sulfate, and I would love to precipitate the copper metal. From looking at the standard reduction potential table, it appears that I can do this by bubbling hydrogen ...
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TiOSO4 Titration Test

I was on the lookout for research topics when I came across this article here. I got a little confused when it said, "The LiDBBQO2 intermediate reacts with another LiDBBQ complex to form Li2O2 in ...
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90 views

Thermal decomposition of metal nitrates: iron nitrate (II) and sodium nitrate - why the different products?

$$\ce{4Fe(NO3)2 -> 2Fe2O3 + 8NO2 + O2}$$ $$\ce{2NaNO3 -> 2NaNO2 + O2 }$$ Why do they decompose in different ways? Why do we get a nitrite with sodium but an oxide with iron?
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Does the rate of ion movment in a salt bridge affect the total voltage produced by a voltaic (Galvanic) Cell?

I was thinking that different salts used in a salt bridge in a voltaic cell may have different rates of flow (perhaps ionic radius or some other property effects the rate?) I was wondering, if some ...
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20 views

Would Al ions still be reducd to Al metal if it was aqueous soltion?

To my knowledge, Aluminium is mostly mined in the form of Aluminium oxide or Al2O3 and then the Bayer process is used to extract and refine the pure Aluminium. Now, The Al2O3 must be in a molten ...
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Molten NaI electrolysis

electrodes: Zinc electrodes electrolyte: molten sodium iodide I know that at the cathode, sodium metal will be formed because only sodium ions are present for reduction. At the anode, originally ...
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43 views

What is a good electrolyte?

During lab, we had been asked to add different metals to a ferroxyl indicator, such as zinc and magnesium. One of the questions is that the gel (ferroxyl indicator) contains good electrolytes such as ...
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89 views

Why do NaNO3 + Al + NaOH yield ammonia?

From Russian test problem 4301: $$\ce{3NaNO3 + 8Al + 5NaOH + 18H2O -> 8Na[Al(OH)4] + 3NH3(g)}$$ How does ammonia evolve here? Is it that we get hydrogen gas evolving in the reaction between Al ...
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76 views

Balancing the redox reaction Cl2 -> Cl^- + ClO3- by half-reactions

I am having some difficulty balancing the following reaction using the half-reaction method: $$\ce{Cl2(g) -> Cl^{-}(aq) + ClO3^{-}(aq)}$$ My attempt at the problem: By determining oxidation ...
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82 views

How do we get NaClO3 in the reaction between Cl2 and NaOH?

From problem no. 4080 in a Russian example exam set: $$\ce{6NaOH + 3Cl2 -> NaClO3 + 5NaCl + 3H2O}$$ How do we get that $\ce{NaClO3}$? I can't seem to guess. I found this explanation on YouTube, ...
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Efficient oxidation of KCl to KClO3

I am trying to convert $\ce{KCl}$ to $\ce{KClO3}$ through an efficient process. I realize that I could electrolyze a solution of $\ce{KCl}$ to obtain some $\ce{KClO3}$ as a precipitate, however this ...
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Efficiency of Electrochlorination

When using electricity to create sodium hypochlorite from a solution of water and dissolved Sodium Chloride. I see in most instances that a fairly concentrated solution of brine (10% or more) yields ...
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For alkali and lanthanide metals, is there a better liquid barrier to oxidation than mineral oil?

Most often mineral oil is used to store, protect reactive metals from oxidation. By far the best choice is to hermetically seal the metal in pure argon or some other inert gas, since, although mineral ...
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69 views

How would using Different Salts in a Salt Bridge Effect the Voltage Generated by Voltaic Cell?

If I use a range of different nitrate solutions (e.g. calcium nitrate, iron nitrate) for the salt bridge in a voltaic cell, what effect would it have on the flow of ions in the Voltaic cells? Will ...
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656 views

Weird Wikipedia Section on Oxidizing Behavior of Nitric and Sulfuric Acids

It has been my understanding that when nitric, perchloric, or sulfuric acids act as oxidizing agents, they must exist as whole $\ce{HNO_3}$ or $\ce{HClO_4}$ or $\ce{H_2SO_4}$ molecules that are still ...
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Clear definition of a 'non-oxidizing acid'?

From the Beryllium article on Wikipedia: Beryllium dissolves readily in non-oxidizing acids, such as $\ce{HCl}$ and diluted $\ce{H2SO4}$, but not in nitric acid or water as this forms the oxide. ...