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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113 views

Why does changing the salt of the salt bridge effect the voltage produced in a galvanic cell?

My experiments results showed that the voltage decreases down $\pu{Group 1}$: $\ce{Cl-}$ salts in the salt bridge. All other variables were kept constant. $\ce{Zn}$ and $\ce{Cu}$ rods were used. ...
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34 views

Can Methylene Blue Detect Spoilage in Food?

Initially, there is already a product which is a sensor based on Methylene Blue, which can detect changes in oxygen levels in a packaging. However, as our thesis project, we decided to take on this ...
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56 views

Carbonyl chloride from stabilized chloroform treated with hydrogen peroxide

In our lab, chloroform contains 0.5–1% ethanol to prevent it from producing carbonyl chloride when exposed to UV light. Will the following reaction occur using such chloroform? $$\ce{CHCl3 + H2O2 -&...
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29 views

Stability of cuprous iodide in aqueous solution

An aqueous solution of $\ce{Cu+}$ is usually unstable, but $\ce{CuI}$ is stable. Explain. $E^\circ(\ce{Cu^2+/Cu+}) = \pu{0.153 V}$ and $E^\circ(\ce{Cu+/Cu}) = \pu{0.521 V}.$ I found this question ...
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18 views

What prevents inner-sphere electron transfer from oxalato-iron(II) to chloro-platinum(II)?

In this book (p. 237), when talking about the reduction of $\ce{[PtCl4]^{2-}}$ by $[\ce{(C2O4)2Fe]^{2-}}$, the author states that There is no easy route for imparting electrons onto the $\ce{PtCl4}^...
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25 views

Is it feasible to measure the pH of solution consisting of hydrofluoric acid, methanol and water using redox potential method?

Is it feasible to measure the pH of $\ce{HF}:\ce{H3COH}:\ce{H2O}$ solution using redox potential method? Can I use this method to calculate the $\ce{H+}$ ions in this solution and specifically, can I ...
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136 views

Displacement by more electropositive metal in non aqueous environment

The more electropositive element should displace metal from it's salts' solution. This can be seen in reaction of copper salts with iron. But, if you try using for example potassium metal as the more ...
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27 views

Make Na or K using carbonate + charcoal?

In the 19th century, Na metal was isolated by heating up Na2CO3 + carbon to 1200 C and distilling and capturing the Na vapor under oil. I tried it a few years ago with a small steel tube welded at ...
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68 views

Help understanding Electrochemistry diagram

I was reading some literature when i came across the following figure and was wondering if someone could help explain it to me. I see on the vertical axis it is potential vs Li/Li+ and see that Oxides ...
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233 views

Electric fields in a galvanic cell

I have read hat there is two types of electric fields exist in galvanic cell.I understand E because of charges accumulated on electrodes but what about other E -field? What does cause this field and ...
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142 views

Reaction of getting jarosite from pyrite

I am doing a PhD about archaeometry in order to study the contaminations and alterations that occur to the ceramics which are buried in a marine environment. In my research, I have found pyrite in the ...
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55 views

Calculate the potential of each electrode, $\ce{Mn(OH)2}/\ce{Mn}$ ox/red couple

So the exercise goes like this: We consider the chemical battery(i have no idea what is its actual english name since i'm translating), $\ce{Mn_{(s)}/Mn(OH)_2//Cu^{2+}/Cu_{(s)}}$ Where $\ce{Mn}$ is ...
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39 views

Can carbon dioxide be used as oxidant for iron?

Determine whether it is possible for $\ce{CO2}$ to be an oxidant for $\ce{Fe}$. Justify your choice by comparing the corresponding half reactions. I found the following half-reactions, both on ...
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324 views

Copper Mirror Reaction

I would like to create a copper mirror on a plate of sandblasted glass. I know that a reaction exists: $$\ce{CuSO4 + N2H2 -> Cu + N2 + H2SO4}$$ I know that such a plate of copper is very weak. ...
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455 views

Manganese (II) oxidation by air

I am studying the reaction of dissolved dioxygen with manganese(II) hydroxide for the Winkler method: 2Mn(OH)2(s)+O2(aq)⟶2MnO2(s)+2H2O(l) The ...
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230 views

What is the electrode potential at the equivalence point if concentrations of titrant and titrand are going to be zero?

Let's assume that the titrand is $\ce{Fe^2+}$ and the titrant is $\ce{Cr2O7^2-}$. Then $$E = E^\circ_\ce{Fe^{2+}/Fe^{3+}} - \frac{RT}{nF}\ln\frac{\ce{[Fe^{2+}]}}{\ce{[Fe^{3+}]}}$$ $$E = E^\circ_\ce{...
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440 views

Why add NaBH4 slowly to 4-t-butylcyclohexanone in ether solution? [Lab Procedure]

$\ce{NaBH4}$ is to be added slowly to 4-t-butylcyclcohexanone in ether solution according to laboratory procedures, but I am curious as to why that is? 4-t-butylcyclohexanone undergoes reduction with $...
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72 views

When can colourimetry be used to determine the rate of reaction?

Can colourimetry be used if a coloured reactant react to give a coloured product? For example, in the reaction of reacting dichromate ions with oxalate ions in acidic environment, where dichormate ...
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44 views

Why is this redox reaction possible?

I have the redox reaction $\ce{N_2H_4 {(g)} + N_2O_4 {(g)} -> N_2 {(g)} + H_2O {(g)}}$. In $\ce{N_2O_4 {(g)}}$, the oxidation state of nitrogen is $+4$. In $\ce{N_2 {(g)}}$, the oxidation state of ...
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108 views

Can you ignite the thermite reaction in a solution?

As far as I know thermite is a typical redox reaction where $\ce{Al + Fe^{3+} -> Fe + Al^{3+}}$ happens. I guess the activation energy is very high, because you need to split the $\ce{Fe_2O_3}$ ...
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87 views

Results of mixing HSbF6 and O2F2

I'm an amateur writer and one of the topics I deal with is what happens when a slightly-mad scientist and engineer is given an opportunity to work with full-on “magic.” So there are situations where ...
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256 views

What's the reaction mechanism for the oxidation of primary alcohols (e.g. ethanol) to carboxylic acids using acidified KMnO4?

I've seen mechanisms for $\ce{MnO4-}$ in base reacting with primary and secondary alcohols to oxidise them, but what about $\ce{MnO4-}$ in acid? All the ones I've found have either been referring to ...
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63 views

Is it possible to produce hydrogen sulfide with tap water and activated carbon or CuZn?

Please note I'm a bit out of my depth with chemistry. The situation: I have a KDF/GAC water filter that defies logic and releases $\ce{H2S}$ (assuming it by smell/taste) in the water after filtration....
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28 views

Relationship between Yield and Applied Potentials

This question revolves around this question from Atkins' Chemical Principles 5th ed., Chapter 13, Question 13.116: Consider the electroplating of a metal $+1$ cation from a solution of unknown ...
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329 views

In a galvanic cell, do the ions from half cell move into the salt bridge?

I know that ions from salt bridge move into the half cell in order to maintain electrical neutrality. But in my book it's also given that ions move from half cell into the salt bridge. For example, ...
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56 views

Mechanism of hydrogen evolution on metal-oxide electrodes

I am looking into the mechanism of different electrocatalytic reaction in acidic media on metal-oxide electrodes. Reduction of on such electrodes generally happens with the help of electrons from ...
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2k views

How do I balance the reaction equation of zinc and nitric acid?

How would you balance the following reaction using the oxidation number method? $$\ce{Zn + HNO3 -> Zn(NO3)2 + NH4NO3 + H2O}$$ My approach: Half reactions: \begin{align} \ce{Zn &-> Zn(NO3)2}...
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227 views

Ionizing radiation and oxidation without oxidizing agents

My knowledge on this subject is a bit rusty, so excuse me if I'm asking the wrong question here. I was taking a look at my high school chemistry books from many years ago, and I noticed that reduction ...
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420 views

The function of sulfuric acid in a reaction involving halide ions

The purpose of the following reactions is to make halogen gas: \begin{align} \ce{2 NaCl (s) + MnO2 (s) + \boxed{\ce{2 H2SO4 (l)}} &-> Na2SO4 (s) + MnSO4 (s) + 2 H2O + Cl2 (g)} \\ \ce{10 KI (...
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32 views

For a system containing three reductants, can a combined reduction potential be determined?

I've modelled a system and found that there are three major complexes present at equilibrium, all of which I hope will act as reductants when I add an additional, oxidised species. Each of the three ...
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1k views

What defines the oxidizing/reducing power of a coordination compound?

For example, I came across a problem in which I was asked to determine whether the complex $\ce{[Cr(H2O)6]Cl2}$ is an oxidizing or reducing agent. How should I proceed? My teacher told me its the ...
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974 views

What is the role of the sulfuric acid in a titration between potassium permaganate and iron ammonium sulphate solution?

So basically my titration was of finding the concentration of potassium permaganate against an iron ammonium solution. In the iron ammonium sulphate solution it consisted of water, iron ammonium ...
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63 views

Corrosion issue at large DC current

I'm no expert in chemistry, but I know that corrosion can cause great problems in systems. I'm working on a prototype, and trying to figure out if corrosion will cause issues. The setup Imagine the ...
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26 views

Regarding rate dependence on redox potential

I am stuck with an equation wherein chloroauric acid reacts with oxalic acid to form Au(s). Even though one of both are enough for the reaction: How does the rate change with increased oxalic acid? ...
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341 views

How do the silicon-hydrogen bonds in polydimethylsiloxane react with a H2PtCl6 catalyst

How does $\ce{H2PtCl6}$ react with $\ce{Si-H}$ to give $\ce{[PtCl4]2-}$? I know $\ce{H2PtCl6 -> 2H+ + [PtCl6]2-}$ but I'm not sure what is next. This question comes from this laboratory ...
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175 views

Could stabilized aqueous ozone be bottled to prevent half life/sanitization window?

Could stabilized aqueous ozone be bottled to prevent half life/sanitization window? Typically upon creating stabilized aqueous ozone, it has a shelf life and a sanitization window of 24 hours from ...
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171 views

When conducting metal/metal ion displacement reactions in a high school laboratory, why does the precipitate metal commonly look black in colour?

For example, take the redox displacement reaction of a strip of magnesium metal (silver color) and a solution of copper nitrate (blue color). The reaction is obviously able to progress due to the ...
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973 views

Redox Titrations Half & Full Equations

I was presented with the following problem and I am finding it difficult to present the half equations for the answers. I managed to produce the half-equation for the Iodine redox. $\ce{2I- -> ...
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28 views

Thermal decomposition results: repeatable in ordinary temperatures?

In thermal decomposition studies where very high temperatures are used (see below for four reactions and their respective temperatures, coming from one paper), can I directly relate these ...
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104 views

Stability of Fe(II)

How stable is Fe(II) in a solution? I am doing simple photometry with fresh samples and I feel like it doesn't oxidize that quickly, but have to use a stabilizing agent (dihydroxyfumaric acid) ...
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38 views

Polymer synthesis with redox initiation

I made four different samples of poly acrylic nitrile (PAN) by going through a precipitation polymerization. The system was initiiated by the redox system $\ce{K2S2O8}$, $\ce{FeSO4}$ and $\ce{Na2S2O5}$...
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600 views

Oxidative cleavage of 2-methylcyclohexa-1,3-diene

What are the products of oxidation of 2-methylcyclohexa-1,3-diene using hot concentrated acidified $\ce{KMnO4}$ solution? Do we approach this problem the same way we would approach oxidation of ...
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379 views

How to determine the equivalence point of a titration of a mixture.

Today, I'm graphing the titration curve for a mixture, to be precise, this particular case: In order to get this done, i've been following wisely the mantra of "The strongest species (oxidizing and ...
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29 views

Why do we always represent only the hydrogen evolution?

In corrosion of aluminium or magnesium for example, we have the anodic reaction which is the dissolution of the metal but for the cathodic reaction we only represent the hydrogen evolution. How about ...
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632 views

Properties of a free radical scavenger

Antioxidants are free radical scavengers and are able to reduce free radicals to make them stable. What I am interested in is why some molecules make for superb free radical scavengers and why others ...
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4k views

Chemical Reactions at the Cathode of the Leclanche Cell

In the dry cell, the overall reactions that occur are: $$\textbf{anode:}~~~ \ce{Zn -> Zn^{2+} + 2e^-}~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~$$ $$\textbf{cathode:} ~~\ce{2NH4+ + ...
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306 views

Type of reaction between metal and salt

What type of reaction is the following? $\ce{ 10Na(l) + 2KNO3 (s) -> K2O(s) + 5Na2O(s) + N2 (g)}$ So far my best guess has been that it's a double replacement reactions with evolution of gas. Is ...
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139 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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257 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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437 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 ...