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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What is the purpose of the solution in a galvanic cell?

In other words: What is the purpose of the solution that the electrodes are immersed in, in a galvanic cell, and is it possible to generate a current without any solution?
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739 views

Concentration cell lower half cell concentration from measured cell potential

I am trying to find the Ksp of silver thiocyanate: AgSCN(s) --> Ag+ (aq)SCN-(aq) but I need to first prove that the lower [Ag+] = 1.27-12 M, but don't know how to find it. The data I am given: ...
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63 views

Finding molecular formula with limited information given

I have recently stumbled upon a question I can't seem to solve : Chlorine can also be used to synthesise a bromine-containing oxoanion that is mainly used in continuous or batch dyeing processes. ...
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173 views

Redox couple notation

How is the redox couple as it is written for the oxidation of $\ce{MnO4-}$, as $\ce{MnO4-,H+/Mn2+,H2O}$ correct? I agree that $\ce{MnO4}$ is being oxidized as it loses electrons (going from -1 ...
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91 views

Identifying if reaction is reduction or oxidation. Is there an error in this question?

I am looking at this reaction: I am trying to determine if it is reduction or oxidation. In the initial molecule I calculate the overall oxidation numbers as: ...
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127 views

Oxidation - Reduction Ionic Half Reaction

Trying to figure out how to balance the following molecular equation: $$\ce{KMnO4 + Na2C2O4 + H2SO4 -> MnSO4 + CO2 + Na2SO4 + H2O}$$ I have compiled all of their oxidation states $$\ce{KMnO4 + ...
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46 views

Electrochemistry - Understanding Diffusion Potential

I have a big problem trying to wrap my head around this for several hours and I cannot seem to make sense of it. I have to link this scheme with the 3 colored potential profiles on the bottom of the ...
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1answer
64 views

How do I balance redox equations with three reactants?

Could anybody please explain me the concept of balancing redox reactions with three reactants? Either some solving steps or even the solution would be very appreciated. For example, I don't know how ...
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24 views

Is there a generalize-able relationship between Ecell and T for a galvanic cell?

Is there a generalize-able relationship between Ecell and T for a galvanic cell (assuming constant concentrations of all components)? (ie: higher temp = bigger/smaller Voltage) Or is it entirely ...
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1answer
55 views

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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Is acidic character related to reducing power?

My book says that the acidic character of halogen acids increases on going down the group because the bond strength decreases, making it easier to release the $\ce{H+}$. But I also know that $\ce{HI}$...
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94 views

What drives the redox reactions in a standard hydrogen electrode?

In this video, the SHE half cell has two redox reactions occurring i.e. $$\ce{2H+ (g) + 2e- <=> H2 (g)}\\ \ce{H2 (g) <=> 2H+ (g) + 2e-}$$ But how can a single half cell initiate the two ...
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Why is manganese oxide precipitated during the syn hydroxylation of alkenes with permanganate ion?

During the hydrolysis step, after the formation of the heterocyclic ring, hydrogen permanganate ion is formed but the final product is manganese oxide precipitate. My point - why would permanganate ...
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103 views

Prevent/Slow down oxidation of organic material

I'm having the hobby to draw paintings with the tea I drink trough the day. Usually I pour a tablespoon of the hot tea away, wait until it dries and gets more concentrated, so the colour is more ...
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5k views

How to balance equation of alcohol oxidation with potassium permanganate?

R-CH2OH(aq) + MnO4{-}(aq) --> R-COO{-}(aq) + MnO2(s) The above equation is the oxidation of a primary alcohol. The media is neutral to start out with, but the product will be basic*. From what I ...
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2answers
7k views

Can cat urine corrode stainless steel?

My cat has a habit of urinating in the bathroom sink. It is unsanitary, but can it corrode the stainless steel plumbing hardware? My friend believes it will, but I disagree. I could believe that if ...
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366 views

How to speed up corrosion of magnesium?

For an experiment, I need a corroded magnesium, but I got fresh mill cutoffs. Is there I way to speed up the corrosion process? Actually would like to simulate a crushed magnesium rod, that spend ...
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1answer
253 views

Working principle of simple chemical cells

I have just learnt about simple chemical cells but I have no idea how to determine which cells will work and which will not and the working principle of those cells. I know that a chemical cell with $...
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1answer
456 views

Writing disproportionation half reactions

Question Write the half equations for the following reaction: $$\ce{3OCl- -> 2Cl- + ClO3-}$$ I know that $\ce{Cl}$ is reduced from an oxidation state of 1+ to 1- (in $\ce{Cl-}$) and is ...
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1answer
80 views

Determining the theoretical mass of gas produced through the process of electrolysis

I have a question that has been stumping me for quite some time. I wish to calculate the mass of gas that is produced from varying concentrations of salt (NaCl) through the process of electrolysis. I ...
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1answer
2k views

How do I determine which is the reduction reaction in a hydrogen peroxide and potassium permanganate solution?

How was it determined that $\ce{MnO4-}$ was reduction, and $\ce{H2O2}$ was oxidation? Also, why wasn’t the equation $$\ce{MnO4- + 2H2O + 3e- -> MnO2 +4OH-}$$ used? Or the $$\ce{H2O2 + 2H+ +2e- -&...
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1answer
187 views

Using the Nernst equation with a gaseous reactant/product

I have a question about using the Nernst equation. $E = E^\varnothing + (0.059/n)(\log\frac{[Ox]}{[Red]})$ Specifically, I am interested in the reaction of $\ce{MnO4-}$ and $\ce{C2O4^2-}$ below: $$\...
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91 views

Why are only elemental halogens used in oxidation of thiols?

I know that purpose of molecular halogen like $\ce{Br2, Cl2}$ is to take away extra electrons on sulfur so that sulfur bridge can form. But can you use any other molecule beside halogen to do the same ...
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1answer
402 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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111 views

Determining iron content by titration

The redox reaction is $$\ce{KMnO4-(aq) + 8 H+(aq) + 5 e- -> Mn^2+(aq) + 4 H2O(l)}.$$ Where does $\ce{H+}$ come from in this reaction? What happened to $\ce{K+}$ in potassium permanganate?
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523 views

Does berylium gain or lose electrons?

Does beryllium want to gain or lose electrons? I know it has 4 protons, 2 valence electrons, and it will gain or lose 2 electrons, but what is it?

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