Unanswered Questions
286 questions with no upvoted or accepted answers
13
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Why do alpha-hydroxy ketones respond positively to Tollens', Fehling's, Benedict's, Schiff's and HgCl2 tests?
I learnt from a certain textbook that aldehydes and formic acid respond positively to Tollens', Fehling's, Benedict's, Schiff's and HgCl2 tests.
However, in another textbook I read that even alpha-...
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10
votes
0
answers
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Why does the reaction of sodium nitrate, aluminium, and sodium hydroxide 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 and ...
- 6,771
8
votes
0
answers
391
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What exactly is an "electron-sponge"?
What exactly an "electron-sponge" [behavior/action/property/system] nickname is, and what makes a material an "electron-sponge" (preferably, quantitatively)?
From what I found, it's typically a ...
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6
votes
0
answers
2k
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Finding theoretical mechanism of sodium thiosulphate and hydrochloric acid
In class we conducted an experiment where we timed reactions between sodium thiosulphate and hydrochloric acid. We kept the concentration of the $\ce{HCl}$ constant, while changing the concentrations ...
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6
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0
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How to determine the iron content in spinach from a titration with permanganate solution?
I used titration to find the mass of iron in a $5~\mathrm{g}$ sample of spinach after leaving the spinach to soak in tap water for five different lengths of times. I added $\ce{H2SO4}$ to the solution ...
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6
votes
0
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373
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Lemieux-Johnson oxidation on cycles
Consider 5-cyano-2,2-dimethylpentyl 4-methylbenzene-1-sulfonate:
What would it yield by a Lemieux-Johonson oxydation ($\ce{OsO4}$, $\ce{NaIO4}$)?
My first guess would have been that $\ce{OsO4}$ was ...
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5
votes
0
answers
73
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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 ...
- 38.4k
5
votes
0
answers
447
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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 ...
CommunityBot
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5
votes
0
answers
122
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Regarding the standard reduction potential and electrolyte/solid interface
I am modelling lithium-sulfur batteries ($\ce{LiS}$ batteries) and a strange phenomenom happens during charge, named infinite charging, which I show below:
The factor $f_\mathrm{C}$ that appears in ...
- 3,671
5
votes
0
answers
78
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Oxygen tolerant RAFT polymerization using AIBN?
I want to do some RAFT polymerizations but don't have a nitrogen line at the moment. It seems that people have recently implemented oxygen scavenging strategies to enable open-air RAFT polymerization. ...
- 30.3k
5
votes
0
answers
120
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Will charcoal (carbon) oxidize in the air?
Wikipedia — Carbon sequestration claims that burying charcoal into the soil offsets $\ce{CO2}$ and thus reduces the greenhouse effect:
In the soil, the biochar carbon is unavailable for oxidation to $...
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5
votes
0
answers
1k
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What are the factors that affect the redox reactions?
In my work, I used $\ce{Co(OH)2}$ and $\ce{Ni(OH)2}$ as an active materials to fabricate as symmetric supercapacitors in which I used 1-butyl-1-methylpyrrolidinium dicyanamide as an electrolyte.
From ...
- 38.4k
5
votes
0
answers
234
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What makes "Color-Safe Bleach" color safe?
The ability of bleach ($\ce{NaOCl}$) to change the color of garments and introduce "bleach stains" is a well-known issue. In this question:
Does bleach turn a substance white or colorless?, the ...
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5
votes
0
answers
334
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Oxidation of alkenes and alkynes by Chromic Oxide?
As far as I know, $\ce{CrO3}$ doesn't effect the $\mathrm{\pi}$ bonds in an inert medium like pyridine. Would $\ce{CrO3}$ in acidic medium reduce alkynes to have the same products as acidified, warm $\...
5
votes
0
answers
303
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Reduction of vanadyl ion
I want to reduce vanadyl to vanadium (III), can somebody please suggest some appropriate methods for it? I am trying to make a redox flow battery for a project but I have only vanadyl sulfate.
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