Questions tagged [reagents]

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8
votes
1answer
378 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
205 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,...
0
votes
1answer
149 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
14 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 ...
-1
votes
1answer
72 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
134 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 $\ce{NaOH}$ ...
7
votes
1answer
288 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
113 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
964 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
74 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
792 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
101 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
391 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 ...
0
votes
1answer
573 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?
1
vote
0answers
638 views

Safest and easiest method to neutralize nitric acid

I would like to know the safest method for neutralizing 70% ACS Reagent Nitric Acid that is used in small amounts of 1-5 ml, for an electronics process in which there will be small traces of silicone ...
6
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 ...