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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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How to quantify the concentration of sodium nitrate leftover from eutrophication through titration?

In my experiment, I am trying to quantify the nitrate absorption by duckweed. I need a titration method to measure the left over nitrate levels in the solution. However, this is to be done in a school ...
Chamuditha Amaratunga's user avatar
-2 votes
1 answer
48 views

What is reduced in the reaction of magnesium with oxygen? [closed]

What is reduced in the reaction $$ 2\mathrm{Mg} + \mathrm{O}_2 \rightarrow 2\mathrm{MgO} $$ An oxygen molecule or an oxygen atom ?
Peter swift's user avatar
0 votes
1 answer
79 views

Does a decomposition redox reaction with a single reactant and non-elemental products exist?

Does a decomposition redox reaction exist with a single reactant and non-elemental products and that this decomposition reaction cannot be decomposed in any condition to yield elemental products. For ...
user147259's user avatar
3 votes
1 answer
331 views

It is possible to synthesize 3,3-diethylpentane ("tetraethylmethane") from carbon tetrachloride?

Compounds like tetraethyl silane or tetraethyltin can be made from their tetrachlorides using ethylating Grignards, but what about substituting carbon, would it work or steric hindrance would prevent ...
Jakub Nadažy's user avatar
1 vote
1 answer
58 views

Etching stainless steel

I need to etch some stainless steel for a project. I found some instructions that only require household chemicals (it's kind of hard to acquire chemicals here). It required 30% HCl and 3% H2O2. I ...
Hristos's user avatar
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1 vote
2 answers
112 views

Criterion for a good explosive

For a mixture to be good explosive, it's components should react violently. In other words it should release more energy in less time. Thus enthalpy change of the reaction should be very high and rate ...
Users's user avatar
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0 votes
4 answers
103 views

How can reduction and oxidation occur separately in batteries if they're meant to be one reaction?

According to this page along with many others, oxidation and reduction must occur simultaneously. However, in a battery, it seems like they actually occur separately. Oxidation must first occur to ...
Evan Williams's user avatar
3 votes
1 answer
457 views

Why isn't NO considered combustible?

According to this (and a bunch of other sources), NO (nitric oxide) is not combustible. But that same source says NO rapidly reacts with O2 to produce NO2, which I thought was the definition of ...
unstable's user avatar
  • 216
-3 votes
1 answer
66 views

Standardizing alkaline ferricyanide solution [closed]

The ferricyanide method of determining reducing sugars is simple but I need clarity on time of addition of potassium iodide solution. I am unable to observe change in color from yellow to blue. I even ...
aj_23's user avatar
  • 1
1 vote
0 answers
29 views

Indirect Titration of Sodium Bisulfite with Potassium Iodate

I'm trying to develop a procedure to determine the concentration (in g/ml) of a solution of sodium bisulfite (NaHSO3). I have already determined the solution concentration using a direct titration ...
Micah_Dermott's user avatar
0 votes
1 answer
50 views

Determining an unknown E° from two similar half ox/redox reactions

Use the oxidation half-cell and reduction half-cell, $\ce{Cr^3+/Cr^2+} = \pu{0.424 V}$ and $\ce{Cr^3+/Cr2O7^2-} = \pu{1.32 V}$, to determine the $E^\circ$ for $\ce{Cr2O7^2-/Cr^2+}$: a. $\pu{-1.75 V}$ ...
Robertsson's user avatar
1 vote
0 answers
52 views

Quenching reagents for specific reaction

A reaction general procedure is given as follows: A mixture of 2-fluoro-5-iodo pyridine $(\pu{1.0 mmol})$, methyl acetoacetate $(\pu{3.0 mmol})$, $\ce{CuI}$ $(\pu{10 mol\%})$, $\ce{K3PO4}$ $(\pu{3.0 ...
Ella's user avatar
  • 39
0 votes
0 answers
49 views

Change in Gibbs energy for lithium redox reaction

I was reading an electrochemistry book by Thomas F. Fuller, in this book the thermodynamic values for the lithium redox reaction at standard conditions are the following: Reaction $\Delta G^o$ [kJ/...
RMS's user avatar
  • 233
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0 answers
69 views

How to predict whether a redox or an acid-base reaction will occur? [duplicate]

I've been thinking a lot about this question, but even after intense research, I didn't find any satisfying answer, even here. So here's my question, illustrated with an example: We have a negatively ...
dark_ursus's user avatar
4 votes
0 answers
68 views

Does catechol give Tollens’ test?

Do hydroquinones like catechol or p-hydroxyphenol give Tollens’ test? I know that β-diketones can reduce Tollens’ reagent to give a “silver mirror”, so I would guess that due to tautomerization ...
KMT's user avatar
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0 votes
0 answers
51 views

Equations for the Winkler method

I learned in my IB chemistry class that the chemical equations for the Winkler method are as follows. Step 1 2Mn2+(aq) + 4OH-(aq) + O2(aq) → 2MnO2(s) + 2H2O(l) Step 2 MnO2(s) + 2I-(aq) + 4H+(aq) → Mn2+...
Mimi's user avatar
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0 votes
1 answer
119 views

What reaction takes place when ammonia and sulfur dioxide are introduced into barium chloride solution?

What reaction takes place when gaseous $\ce{NH3}$ and $\ce{SO2}$ are introduced into $\ce{BaCl2}$ solution and an insoluble white solid is produced? I think that the white solid could be $\ce{BaSO4}$ ...
youthdoo's user avatar
  • 133
0 votes
1 answer
86 views

Energy released by aluminum reactions

I heard that aluminum reacts violently when exposed to hydrochloric acid. I was wondering how much energy is released by this reaction. Preferably in MJ/kg or MJ/l. Assuming the reaction needs 2 moles ...
Nitrogen-8's user avatar
-2 votes
1 answer
58 views

Hydrogen oxidation number

I am aware that since 2005, IUPAC guidelines established that hydrogen is more electronegative than all elements from group V in the periodic table (you can check official documentation). Thus, $\ce{...
SerMig1111's user avatar
0 votes
3 answers
110 views

Why are we permitted to add things to balance redox equations?

Consider balancing redox half equations. As a general rule, we can add electrons, water, hydrogen ions or hydroxide ions to balance the redox half equation. However, it is not entirely clear why we ...
11221's user avatar
  • 25
-1 votes
3 answers
74 views

Inconsistency in balancing of the equation for lead sulfide oxidation by ozone [duplicate]

The following question was asked in JEE Examination : $\pu{1 mol}$ of $\ce{PbS}$ is oxidized by $X\ \pu{mol}$ of $\ce{O3}$ to get $Y\ \pu{mol}$ of $\ce{O2}$ : The answer to which is given as 8. If I ...
orionbuff_62's user avatar
2 votes
2 answers
130 views

Does the electric field of a battery exist before a wire is connected outside?

Imagine a galavanic cell. What I am wondering is, what causes the inital oxidation of the less nobel metal to occur initally. Is the electric field there before you connect a wire, which would allow ...
Niclas's user avatar
  • 129
-2 votes
3 answers
73 views

Redox half-reactions involving gold at three distinct oxidation states

I am preparing for my exam, and for some reason really struggle with half-reactions in the context of Galvanic cells. I do manage to solve the more straight forward questions, but really struggle with ...
Idan Ofek's user avatar
1 vote
3 answers
87 views

How to deduct the concentration of chloride in a silver/silver chloride electrode, given the cell notation

I have this cell notation: $$ \ce{Zn|ZnCl_2(0.05M)||AgCl(s)|Ag} \tag{1} $$ What is the physical shape of this cell? I know $\ce{AgCl}$ has very low solubility, and the problem has no concentration on ...
Martín Montoto Fernández's user avatar
5 votes
0 answers
446 views

How to explain oxidizing power from Molecular Orbital Theory

I am trying to explain the oxidizing property of $\ce{Fe^3+}$ in $\ce{H2O}$ and $\ce{CN^-}$ which is $\ce{[Fe(H2O)6]^3+}$ and $\ce{[Fe(CN)6]^3-}$. The electrochemical reactions along with their ...
Shira's user avatar
  • 588
-3 votes
1 answer
66 views

Aqueous electrons in electrochemical cells [closed]

In the context of a zinc-copper electrochemical cell, zinc atoms at the anode are oxidized, releasing electrons and forming zinc ions that dissolve into the solution ($\ce{Zn(s) -> Zn^{2+}(aq) + 2e-...
Kris's user avatar
  • 1
0 votes
1 answer
43 views

Non-catalysed exhaust gas

I'm writing up an academic paper (medical) on in-car exhaust levels and their effect on health. So as to ensure detection of leak-points that are located further along than the catalytic converter, in ...
Medical_researcher's user avatar
2 votes
0 answers
62 views

Copper reaction with nitric acid

According to this paper, the green colour from the reaction of copper and nitric acid could be explained: The color is greenish, probably as a result of a combination of the pale-blue color of the ...
user avatar
0 votes
1 answer
57 views

Neglected partial pressures dependence of water splitting

I am studying electrochemical water splitting and I have a huge doubt. The standard redox potential for the total reaction is 1.23 V, but this is in standard conditions, where the hydrogen and oxygen ...
th3f4tk1ng's user avatar
2 votes
2 answers
260 views

Oxidation of compounds vs elements

I was under the impression that when talking about oxidation/reduction, we are referring to specific elements, and the changes in their oxidation numbers. However, I saw the following reaction ...
firstnamelastname45341's user avatar
-3 votes
2 answers
98 views

Is it possible to make thermite that detonates? [closed]

Why does thermite burn pretty slowly? Can it burn much faster if the components were ground to much smaller grain sizes? Can it be made to actually detonate--that is, the entire pile turning into ...
John Smith's user avatar
1 vote
2 answers
55 views

Oxidation of Isopropanol by Permanganate in Basic Solution

so I've been designing an experiment where I will explore the effect of isopropanol concentration on the colour change of a solution containing permanganate, isopropanol, and NaOH. I know that the ...
Brian Yu's user avatar
2 votes
0 answers
54 views

How can I refine my method of determining iron content in spinach?

I have begun a chemistry experiment that attempts to determine how iron content in spinach is affected by the length of time it is cooked. Through research, I learned that iron content is often ...
beebs's user avatar
  • 21
-2 votes
1 answer
82 views

How does electric current flow in daniell cell?

The actual question in my mind is that ……..at anode zinc oxidises to form $\ce{Zn^{2+}}$ and $2$ electrons, but it should be the same case at cathode because copper should also oxidise to form $\ce{Cu^...
Physics student's user avatar
-2 votes
2 answers
91 views

Help in balancing redox reaction

I've started balancing redox reactions, and one particular reaction has tripped me up. $$\ce{PbS + O3 -> PbSO4 + O2}$$ $\Delta ON$ for $S =8$ $\Delta ON$ for $O =-2$ Here, $O_2$ acts as a spectator ...
Mr Gubbo's user avatar
0 votes
0 answers
45 views

Disproportionation reactions

Are there any examples of a disproportionation reaction being harnessed to do useful electrical work? It is of course possible in a comproportionation reactions, such as a lead-acid cell.
Bill Harrison's user avatar
-2 votes
2 answers
119 views

How do electrons travel through a fuel cell or flow battery with multiple cells?

I understand that if you have a fuel cell or flow battery with a single cell that electrons will go from the electrode and through an external circuit across the load which the fuel cell / flow ...
DavePiae867's user avatar
-1 votes
1 answer
57 views

Redox Reaction Half Equations

$$\ce{PbS(s) + 4 H2O2(aq) -> PbSO4(s) + 4 H2O(l)}$$ I been trying to find the half equations for a while now. How would you find the balanced half equations for this redox reaction? Do you just add ...
Tom Xia's user avatar
  • 19
0 votes
0 answers
40 views

Using biochemical standard state versus chemical standard state

Can I use the table below to calculate the standard cell potential, $E^{\circ}$, of ethanol oxidation to acetaldehyde (EtOH + 1/2O2 $\rightarrow$ Acetaldehyde + H2O)? Does it matter that the half-...
GMoss's user avatar
  • 311
-1 votes
1 answer
78 views

Potassium permanganate and hydrogen peroxide decomposition

I saw a reaction by chemicalforce on YouTube where he decomposed $\ce{H2O2}$ into $\ce{H2O}$ and $\ce{O2}$ using potassium permanganate. The permanganate is a catalyst in the reaction. I am wondering ...
ChemEng's user avatar
  • 291
-4 votes
1 answer
64 views

How would you balance this equation by half reaction [closed]

$\ce{Na + Hg2Cl2 —> NaCl + Hg}$ I was told to balance this reaction by using the half reaction method. I am confused to as how you would do that since the $\ce{Cl}$ is with both the $\ce{Na}$ and ...
Friendly Carrot's user avatar
3 votes
1 answer
180 views

How and when do redox indicators work?

In redox titrations, for example cerimetry, cerium(IV) is reduced to cerium(III) with a reducing analyte. The Ce(IV)/Ce(III) redox potential is around $\pu{1.76 V}$. We keep track of the solutions' ...
Mäßige's user avatar
  • 265
6 votes
3 answers
611 views

What part of ascorbic acid is oxidized when it reacts with iodine?

When vitamin C reacts with iodine, it will lose two of its electrons (oxidation) which iodine will accept (reduction). What I do not understand is what part of the vitamin C exactly is losing the ...
user138990's user avatar
-5 votes
1 answer
225 views

Is the n factor/ valency factor of H3PO4, 2 or 3? [closed]

I'm very confused with search results I see on Google and different websites. I think the n-factor of H3PO4 is 3 because three H atoms are already bonded to three oxygen atoms. But some sources say it ...
NNS's user avatar
  • 1
4 votes
1 answer
69 views

Does reduction occur well above the reduction potential?

I was reading the voltammetry section of Analytical Chemistry 2.1 (Harvey), and it says that for the reduction of $\ce{[Fe(CN)^{III}6]^3-}$ to $\ce{[Fe^{II}(CN)6]^4-}$, which has a standard reduction ...
mertvy's user avatar
  • 128
-1 votes
1 answer
74 views

Effects on pressure on reverse electrolysis

I am interested in the effects on pressure of the following reaction. $$\ce{O2 + 4H+ + 4e- → 2H2O}$$ I have been trying to find data on this for a while, and I am sure that the information exists, but ...
Evelyn21's user avatar
0 votes
1 answer
166 views

Is it not possible to balance the equation $\ce{I2 +O3 -> I4O9 +O2}$ in many ways? [closed]

The above reaction can be balanced in many ways. For example, the coefficient of $\ce{I2}$ is two when coefficient of $\ce{I4O9}$ is one. But the coefficient of $\ce{O3}$ and $\ce{O2}$ can be 5 and 3 ...
Rassank's user avatar
  • 99
-5 votes
2 answers
42 views

Will H+ ions undergo reduction at cathodes in a chemical cell? [closed]

Metal P is the cathode, and it should attract anions. In this cell, anions present are Cl- and OH-, but they are reducing agents, reduction should occur at cathodes. So will H+ ions undergo ...
gatiskandis's user avatar
2 votes
2 answers
227 views

Does ferrocenium chloride ([Fe(C5H5)2]Cl) exist as a stable compound?

I am interested in using ferrocenium chloride ($\ce{[Fe(C5H5)2]Cl}$) for a synthesis application, but I couldn't find any sources referring to its existence, even though some websites and a figure in ...
psansoldo's user avatar
3 votes
1 answer
173 views

Role of MnSO4 in permanganometric titration

This might sound like a stupid question, but I have been unable to wrap my head around it. Recently in a lab I had to titrate H2C2O4 with KMnO4 in acidic medium (H2SO4). However, in the work, it ...
confusionfromarizona's user avatar

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