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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Will lugols Iodine solution react with L-Phenylalanine?

And is possible to increase the iodine/potassium iodate concentration in the lugols by evaporating off the water? Hi, I'm making a moisturizer for my sister who has skin problems. Some potential ...
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22 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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33 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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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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37 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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+50

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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Does ion exchange take place inside the salt bridge? [closed]

Is there any phenomenon that takes place in the salt bridge if yes please explain about it?
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8 views

Electrochemistry - salt bridge [closed]

If we use a salt bridge do the contents present in both the cells change?
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27 views

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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2answers
36 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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55 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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42 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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1answer
85 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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1answer
116 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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Finding the E^zero of cell

For finding the $E^0$ of cell, sometimes the anode is reversed and sometimes it's kept as it is. Anybody can tell me how to distinguish between when to reverse it and when to not?
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16 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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2answers
47 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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11 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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2answers
131 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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1answer
18 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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1answer
96 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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33 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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21 views

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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1answer
79 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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13 views

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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1answer
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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31 views

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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42 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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84 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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35 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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71 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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43 views

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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21 views

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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22 views

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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1answer
53 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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1answer
650 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. ...
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Why does carbon(monoxide) reduce iron ions?

Based on the electronegativity and ionization values of carbon and iron it does not seem logical that during the production of iron from iron-oxide carbon would reduce iron ions as carbons ...
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50 views

How does a copper piece added in nitric acid change after nitrogen dioxide starts appearing?

There's an experiment I have no way of performing but want to know its results. The instructions (in short) are: Dip a piece of copper in a glass of concentrated nitric acid, $\ce{HNO3}$, using a ...
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1answer
29 views

Half cell reactions for oxidation of water by acidified solution of potassium dichromate

From Chemguide: I don't understand the first equation. The chromium atoms in the dichromate ion receive 6 electrons, and their oxidation state declines from 6+ to 3+. But where do the 14 hydrogen ...
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19 views

Mid point reduction potential

A solution of $100\ \mu \mathrm{mol\ L^{-1}}$ nicotinamide adenine dinucleotide has an absorbance of $340\ \mathrm{nm}$ of zero when in the $100\%$ oxidized form and $0.0622$ when in the $100\%$ ...
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1answer
35 views

Removing aluminum “corrosion?”

I have some aluminum alloy, possibly 6063 or 7050 (no clue really) which has corroded. The finish might be silver-anodized but I doubt it due to the high polish, could be urethane. The item is a ...
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1answer
397 views

Why does sodium produce predominantly sodium peroxide when burned in air?

From Wikipedia's article on sodium: When burned in dry air, it forms primarily sodium peroxide with some sodium oxide. We know that sodium has a strong reducing capacity, so why does it produce ...
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65 views

Which alcohols change CrO3/H2SO4 from orange to green? [closed]

Which of the following sets of compounds cannot turn a clear orange solution of $\ce{CrO3/H2SO4}$ to a greenish opaque solution? (More than one answer is correct) A) Ethanol B) 2-...
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56 views

Can oxidation of ethanol by copper(II) oxide yield copper(I) oxide as one of the products?

We know that ethanol is oxidised by copper(II) oxide to an aldehyde. Copper is reduced from $\ce{Cu^2+}$ to $\ce{Cu}$. Can this reaction, with some specific condition, yield $\ce{Cu2O}$ instead? That ...
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25 views

In a galvanic cell where the two electrodes are in the same electrolyte solution, why do reduction and oxidation occur separately?

In a certain book, I was presented with the following solution: An iron nail is attached by a piece of wire to a magnesium ribbon, and the iron and magnesium are placed into the same container, with ...
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1answer
189 views

Why does LiAlH4 reduce an amide to an amine but only reduce a ketone/aldehyde to an alcohol?

Here are two different reactions in which lithium aluminium hydride, $\ce{LiAlH4}$, reduces a carbonyl group: Why does $\ce{LiAlH4}$ completely remove the oxygen from the amide but only reduces the ...
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1answer
35 views

Isn't the reaction of chloral with sodium hydroxide a disproportionation reaction?

Chloral undergoes a haloform reaction with sodium hydroxide. Now the carbon atoms in chloral are in the $\mathrm{+III}$ and $\mathrm{+I}$ oxidation state. Chloroform’s carbon is in the $\mathrm{+II}$ ...
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378 views

How does aluminium react with bases to form aluminates?

An example of reaction: $$\ce{2Al + 2KOH + 6H2O->2 K[Al(OH)4] + 3H2 ^}$$ Aluminium is not ionic, how then does it attract the $\ce{OH-}$ groups to bond with them into the complex ion $\ce{[Al(OH)...