Questions tagged [reagents]
The reagents tag has no usage guidance.
26
questions
1
vote
0answers
45 views
Blue Tinge for White Paint [closed]
I am trying to make an aqueous white paint with Mica and TiO2 as mainstay that gives a slight tinge of blue when it dries but should remain white while in solution.
So far I have tried optical ...
-2
votes
1answer
53 views
Making pyridine with copper sulfate
I have a simple question. I am going to make some pyridine by thermal decarboxylation of niacin. Copper carbonate is out of the question, as is copper chromite. I was just wondering if copper sulfate ...
3
votes
2answers
174 views
Action of EtONa/EtOH on compound containing -CN group
In the above question, I know compound A will be prepared by just replacing -Cl with -CN group in the starting compound. I wanted to know what work would be C$_2$H$_5$ONa/EtOH doing in order to make ...
3
votes
1answer
274 views
Why do we have to use anhydrous AlCl3 in Gatterman-Koch Reaction?
In reference to a Gattermann-Koch reaction, such as the one shown below:
Why does $\ce{AlCl_3}$ have to be anhydrous?
Why can't we just use normal $\ce{AlCl_3(H2O)_6}$?
What would the reaction look ...
2
votes
1answer
144 views
Reduction of conjugated ketone with lithium aluminium hydride
I came across a question about reduction of a conjugated ketone with $\ce{LiAlH4}$.
Although it seemed quite easy at first sight, everything became cloudy as I dug deeper. My doubts regarding the ...
3
votes
0answers
177 views
How can I store reagent under inert gas?
I need to store some aliquots of 2,3,5-tribromothiophene. I searched for how to store reagent under inert gas, And I found this : https://avantilipids.com/tech-support/faqs/protect-from-oxidation
In ...
3
votes
0answers
48 views
What is the difference between lead tetraacetate and sodium periodate as reagents?
I recently came across this question which has confused me about the usage of $\ce{Pb(OAc)4}$ and $\ce{NaIO4}$ reagent.
Both the reagents have nearly the same cyclization mechanism, but the answer to ...
0
votes
2answers
105 views
Major product in reaction of butan-2-one + selenium dioxide
When reading about $\ce{SeO_2}$ I read this following reaction:
$\ce{CH3CH2COCH3 ->[SeO2] CH3CH2COCHO + CH3COCOCH3}$
In the following reaction it was stated that $\ce{CH3CH2COCHO}$ was the major ...
1
vote
1answer
197 views
Reagent notation: meaning of dash(-) and line(|) or slash(\) in reagents
I've seen a lot of reagents which have a slash between two compounds, such as Lindlar's catalyst which is $\ce{H2}$ along with $\ce{Pd|BaSO4}$. I know that the sulphur is a poison here but in general, ...
1
vote
1answer
62 views
Dihaloalkane reaction with sodamide/ammonia [closed]
In the following sequence of reactions:
$$\ce{CH3-CH2-CH2-I ->[\text{Alc.}~KOH] \textbf{A} ->[Br2] \textbf{B} ->[NaNH2/NH3] \textbf{C}}$$
the product C is:
alkene
alkanol
alkyne
alkylamine
...
1
vote
1answer
110 views
How can one determine if all reagents will react in the reaction? [closed]
Is it correct that all the reagents above the arrow will participate to form an intermediate product, to which the reagents below the arrow are then added, and they react to form the final product?
...
9
votes
1answer
506 views
Why isn't sodium hydrogen phthalate used instead of KHP?
Why is potassium hydrogen phthalate (KHP) ubiquitously synthesized and used as a primary standard, while sodium hydrogen phthalate isn't even available to buy?
4
votes
1answer
218 views
TKN: Why are they called Missouri tablets?
When analyzing for Total Kjeldahl Nitrogen (TKN), you can make a copper sulfate digestion solution in the lab or purchase a variety of pre-prepared digesting tablets for example on VWR. My question is,...
1
vote
1answer
510 views
Reaction of 1,2-diketones with periodic acid [closed]
$\ce{HIO4}$ can oxidise alcohols. But does $\ce{HIO4}$ undergo any reaction/act as oxidant with 1,2-diketones?
0
votes
0answers
24 views
extract cellulose from CMC using cuoxam reagent (schweizer's reagent)
Good day, I am new in the field of chemestry. My question is, if it is possible to reverse or extract (I am not very sure how to say it), cellulose from carboxymethyl cellulose (CMC) by the use of ...
-2
votes
1answer
197 views
Why don't we use silver hydroxide instead of Tollen's reagent for test of aldehydes? [closed]
AgNO3+NH4OH=AgOH+NH4NO3
AgOH is used for the reaction with aldehyde. But why can't we use silver hydroxide directly?
3
votes
1answer
208 views
Labware to handle hot aqueous NaOH
This question regarding appropriate handling of hot concentrated aqueous $\ce{NaOH}$ - with particular concern for avoiding dissolution of borosilicate glassware and contamination of the $\ce{NaOH}$ ...
8
votes
1answer
538 views
Can I make a mirror on PET plastic using Tollen's reaction?
I want to make a very shiny surface, like a mirror. I tried to use chrome paint but it's barely shiny. It's more like gray even though I bought one of the most expensive chrome looking paint.
I know ...
-2
votes
1answer
280 views
1000 mg/L alkalinity as CaCO3 standard preparation [closed]
How do I prepare a 1000 mg/L alkalinity as CaCO3 standard? I found a method that says to dissolve 1.06 g of sodium carbonate (Na2CO3) in 1L of water but I'm not sure why I can't use 1g instead? ...
0
votes
2answers
1k views
How tartaric acid gives Tollen's test?
I wanted to know how Tollen's test is given by tartaric acid. Google searches say that it belongs to some "Hydroxyl" group. I know that it oxidises aliphatic and aromatic aldehydes along with α-...
0
votes
0answers
115 views
Should I use MCPBA here?
I came across a question that asked for a method to convert propene to glycerol. I used the method in the pic, but I'm worried about two steps-
Step-2, This reaction is just made up by myself! I'm ...
2
votes
0answers
900 views
Detecting alkaloids - Dragendorff's reagent
I am writing a book and as part of the plot one of the characters has a plant that contains alkaloids in tincture form. They want to do a test to detect for the alkaloids so they use the Dragendorff's ...
0
votes
2answers
158 views
Wetting agent for H2O2 solution
I need to increase the wetting of an $\ce{H2O2}$ solution on ceramic surfaces. Does anyone know of a common chemical I can use for this?
The properties it would ideally have are:
Increases wetting ...
4
votes
1answer
545 views
Salt used in Perkin Reaction
The Perkin reaction gives an α,β-unsaturated aromatic acid by the aldol condensation of an aromatic aldehyde and an acid anhydride, in the presence of an alkali salt of the acid. Here is an a diagram ...
1
vote
1answer
1k views
Why does 3-hydroxy-butan-2-one give positive Tollens' test?
Why does 3-hydroxy-butan-2-one give a positive Tollens' test despite the absence of an aldehyde group? What is the mechanism?
7
votes
0answers
2k views
Is hydronium an electrophile, nucleophile, both or neither?
Is hydronium an electrophile or a nucleophile? I expected $\ce{H3O+}$ to be a nucleophile due to the presence of electrons in the $\ce{2p}$ orbitals of $\ce{O}$. But the answer key of the test states ...