Questions tagged [solvents]

A liquid, solid, or gas that dissolves another solid, liquid, or gaseous solute, resulting in a solution that is soluble in a certain volume of solvent at a specified temperature.

Filter by
Sorted by
Tagged with
4 votes
2 answers
416 views

Suitable solvents to dissolve Aluminum Chloride (anhydrous) without generating Hydrochloric Acid (aqueous or gas)

Hypothetically, I have a chemical tank that was brought out of service and the solid deposits at the bottom of the tank primarily contain aluminum chloride. The whole system never sees water, and the ...
  • 41
-1 votes
2 answers
44 views

How long can dimethyl sulfoxide be safely stored in a HDPE "barrier bottle"?

How long can dimethyl sulfoxide be contained in a HDPE barrier bottle without any reaction between the plastic and the solvent? I have read that DMSO is not reactive with HDPE, but I would like to ...
  • 99
0 votes
1 answer
71 views

How can I choose the right solvent to remove pigment from cotton

I’m trying to figure out how I might be able to dissolve a pigment without destroying the substrate(cotton, very thin). I don’t know the exact pigment, so it’s a guessing game. It is violet, I suspect ...
  • 11
6 votes
0 answers
41 views

Are all humectants sticky?

While using a topical lotion based on ethanol, water and propylene glycol, I noticed that it becomes sticky while drying. Propylene glycol is a humectant and is used for this purpose in ...
  • 447
1 vote
1 answer
43 views

Is vapour pressure truly a colligative property?

Colligative properties are generally defined as A colligative property depends only on the ratio of the number of particles of solute and solvent in the solution, not the identity of the solute. ...
  • 117
0 votes
1 answer
67 views

Does a solvent with the following properties exist? [closed]

I am looking for a solvent with these properties: It's aprotic. At 1 atm, it has a liquid range of at least 0 to 50 degrees Celsius. Water can dissolve in it, with a solubility of at least 10g/100g. ...
0 votes
0 answers
41 views

What is the best way to get a small amount of chemical from a 4L bottle?

I have 4L of multiple chemicals but often only need to work with a few mL at a time. What is the best way to go about this procedure without wasting much of my chemicals? Pipetting out of the large 4L ...
  • 29
2 votes
0 answers
35 views

At constant solvent activity, do solution properties depend on identity of the solute?

When a substance is dissolved or mixed with water in high concentrations, the activity of water drops from 1 to a value that depends on the substance and its concentration. Is it correct to say that ...
3 votes
0 answers
38 views

Why does column chromatography not work like it's supposed to?

I'm a few months into working in an organic synthesis lab and I consider myself to have a solid intuition for, well, how chemistry works. I have ran at least 50 columns at this point but no matter ...
3 votes
0 answers
46 views

Use of boron(III) oxide for drying acetone

Acetone undergoes aldol self-condensation in the presence of acids or bases: which makes drying agents such as 3A/4A molecular sieves, barium oxide, potassium hydroxide and carbonate (basic), copper(...
  • 35.8k
1 vote
1 answer
54 views

Decomposable solvent identification in GC-FID

How can a gas chromatography with flame ionization detection (GC-FID) be used to identify a liquid solvent that decomposes at its boiling point like DMSO? In a solution with other higher boiling ...
0 votes
0 answers
81 views

Why don't secondary alcohols react with HBr/HI via SN2?

In polar protic solvents, $\ce{Br-}$ and $\ce{I-}$ are considered to be very good nucleophiles. Now, here the solvent is alcohol which is polar protic. So, why don't secondary alcohols react with $\ce{...
's user avatar
7 votes
2 answers
296 views

Why is NMP developing a yellow color after distillation?

I got an aqueous mother liquor of N-methyl-2-pyrrolidone (NMP) from some reaction I was running and when I redistilled it under vacuum, it came out colorless but turned yellow the next day. I am ...
1 vote
1 answer
136 views

Is there an acid (or other solvent) that dissolves nickel but not brass?

Preferrably one that is common or easy to make using common chemicals. My application is to remove nickel plating from brass parts. Right now the best solution I have is to scrape and chip it off, but ...
4 votes
2 answers
134 views

What solvent dissolves calcium nitrate but not ammonium nitrate?

I am experimenting with a precipitation reaction between ammonium sulfate solution and calcium nitrate. Calcium sulfate precipitates and can be filtered out easily. I am wondering if there's a way I ...
1 vote
1 answer
40 views

What factors influence the upper size limit of micelle's?

Is there an inherent size at which micelle's cannot grow larger in volume? I have been trying to find a quantifiable method of measuring a size limit with all the variables that affect micelle ...
1 vote
1 answer
81 views

Why is instant coffee powder not as dark as the coffee resulting from it?

Instant coffee granules generally are of a light brown colour, while coffee made from it is a deep black. Pigments are far more concentrated in the dry form, to add water is to dilute them. Still, ...
  • 415
1 vote
1 answer
180 views

Isopropyl Alcohol Resistant Paint

Which paint binders are most resilient to IPA? Background: I'm looking for an IPA-resistant spray paint to coat a 3D printed model composed of a high-performance stereolithography resin MSDS. "...
  • 111
0 votes
1 answer
84 views

What should be done to decrease the pressure of the HPLC column?

After using an HPLC (C18) column several times it doesn't do what it has to do. When we use it the HPLC instrument shows a very high pressure and the process stops. We have washed with methanol, water,...
's user avatar
0 votes
1 answer
110 views

Is acetone an effective solvent for bitumen?

Japanning is an age old process of protecting metal surfaces by applying several successive layers of a syrup-like black coating and then baking it to a hard and durable finish. It was often applied ...
0 votes
0 answers
14 views

Which single parameter can tell about the absolute as well as relative position of a solvent wrt a specific polymer in Hansen Space?

I am trying to represent solutions of a specific polymer (let's say PVDF) dissolved in various solvents using a single parameter. By various solvents I mean single solvent (e.g. DMF) or solvent blends ...
0 votes
0 answers
191 views

Overtreatment of vintage rubber parts with Wintergreen oil

I have read in many places that treating old rubber parts with wintergreen (methyl salicylate) will soften the rubber again. The method I chose was on this website . I have seen many ways to do the ...
  • 109
3 votes
1 answer
172 views

Cannabigerolic acid (CBGA) and cannabidiolic acid (CBDA): Solubility in ethanol

How much CBGA and CBDA can be dissolved in a given amount of ethanol at room temperature? I did a bit of research but could not find any source on solubility of these substances in ethanol. For ...
1 vote
0 answers
33 views

Relationship of oxygen dissolved in water with bubble time and temperature

I'm using the Winkler method to calculate oxygen dissolved in water. This is at the temperatures 20, 30, 40, and $\pu{50 ^\circ{}C}$ and I bubbled a controlled amount of oxygen in through the reaction ...
  • 21
1 vote
1 answer
73 views

Optimal lipophilic solvent for washing PEEK-lined reversed-phase HPLC columns

What would be the reasonable strategy for washing a reversed-phase (RP) octadecylsilyl (ODS) C18 HPLC columns from lipids and other non-polar residues? The columns are used for biochemical analysis of ...
  • 35.8k
2 votes
2 answers
118 views

Are there any cold temperature reactions in liquid where ice forms as a precipitate?

The title asks the entire question, but I'll elaborate: Precipitates form in aqueous reactions when some product is insoluble in water. Is there a reaction in some other solvent where solid water ...
0 votes
0 answers
14 views

Organic solvent that won’t attack either PET or butyl rubber?

I am looking for a suitable organic solvent for dissolving dried-on polyurethane adhesive on a substrate of nylon/butyl/polyester. Acetone is ruled out because it attacks polyester (PET) and Toluene ...
2 votes
0 answers
42 views

Solvent choice in imine formation from quercetin and poly(allylamine)

I am trying to react quercetin and poly(allylamine) to form imine on the repeating units. Poly(allylamine) is dissolved in water. The problem is the choice of solvent. Poly(allylamine) is soluble in ...
  • 887
1 vote
0 answers
449 views

Total number of Isomers of [Co(NH3)5(NO2)](NO3)2 [closed]

I encountered this question in my country's Chemistry textbook of class 12. No solutions are published, but the answer given at the back states - "There are 10 possible isomers. (Hint: There are ...
2 votes
0 answers
21 views

DEG monobutyl ether pH change

We are using DEG monobutyl ether (CAS 112-34-5) in our production. Normally it is pH neutral, however suddenly we noticed that it has shifted to being acidic (pH=3.4). What has changed in the material?...
  • 121
0 votes
0 answers
37 views

Waste management of hazardous solvents

How should one safely dispose of chemicals like dichloromethane, toluene or acetone that were mixed with water? Is the water contaminated to a degree that it needs also treatment? For example ...
  • 1
1 vote
0 answers
28 views

By what chemical process does shellac in alcohol degrade over time?

It is well established that shellac dissolved in alcohol ('liquid shellac') has a limited shelf life. The actual shelf life is highly variable, depending on the source, manufacture, storage. But after ...
0 votes
0 answers
86 views

Reaction of 3-chloro-2,2-dimethylbutane with sodium ethanolate in EtOH, which mechanism?

When we let 3-chloro-2,2-dimethylbutane react with sodium ethanolate in EtOH, which reaction do we expect? SN2, E2, E1 or SN1? I would say it's an SN2 reaction because ethanolate is not that strong of ...
's user avatar
-4 votes
1 answer
7k views

How much solvent do you add for a 1:20 dilution, and why is it called 1 to 20? [closed]

A 1:20 dilution implies that you take 1 part of stock solution and add 19 parts of water to get a total volume of diluted solution equal to 20 times that of the stock solution So is ...
1 vote
0 answers
21 views

How do dielectric molecules in a liquid phase align when polarized?

As seen in the diagram, when a dielectric material becomes electrically polarized, the molecules align themselves in a manner where the respective charges are parallel to each other horizontally. ...
-2 votes
1 answer
116 views

Why can covalent compounds dissolve in organic solvents? [closed]

Why can covalent compounds dissolve in organic solvents? I researched about it a little and I found an article which said: "Mostly all organic compounds are non-polar in nature. Also, covalent ...
1 vote
0 answers
34 views

Is there a easy way to estimate how quickly something will dissolve depending on its surface area?

How exactly does the surface area of a solid for example a cube of sugar, affect the speed of its solvation. I guess everyone has observed that a batch of fine grounded sugar or salt dissolves much ...
4 votes
0 answers
85 views

2-Iodoxybenzoic acid oxidation reaction

I was thinking about using 2-Iodoxybenzoic acid to selectively oxidize primary alcohols to aldehydes. I've found papers using various solvents like acetone/water mixture1, 2-methyl-2-propanol2, DMSO ...
  • 203
3 votes
0 answers
52 views

Why do different products form when alkali halide reacts with zinc in polar protic and aprotic solvents?

Let's take an alkali halide such as $\ce{CH3CH2Cl}$ the two reactions in polar protic and aprotic solvents are as follows: $$ \begin{align} \ce{CH3CH2Cl &->[Zn, CH3OH] CH3CH3}\tag{R1} \\ \ce{...
  • 1,359
2 votes
2 answers
802 views

Miscibility gap of heptane-methanol mixture

To explain my question a bit better: I added heptane and methanol together in equal ratios (1:1) and observed a separation in phase where there appeared to be an oily layer sitting on top of the other ...
0 votes
2 answers
70 views

Why is oil solubility improved in solvents at higher temperatures?

This is in the case of extracting plant oil using a solvent extraction method for the purposes of biodiesel production. In a paper, it is stated that increased oil yield may be due to the 'increase in ...
3 votes
0 answers
38 views

In solvent extraction from plant cells, what is the static organic solvent film formed?

I am researching the mechanisms behind solvent extraction of oil from microalgal cells, and it is stated in one paper that in the process of transferring the lipid out of the cell, the solvent-lipid ...
-1 votes
1 answer
552 views

Why do polar solvents seem to be of lesser viscosity than non-polar ones? [closed]

For instance, in Russian there is an adjective "oily", which means a liquid of high viscosity. Is this assertion even true in general or statistically?
  • 1,476
2 votes
0 answers
55 views

How to model a molecule of benzene surrounded by 100 molecules of water with molecular dynamics?

I have experience calculating molecular properties (mostly DFT). However, I would like to spend some time on molecular dynamics methods. I would like to ask your advice to direct me towards a program ...
's user avatar
3 votes
0 answers
65 views

How can the activity of ions be more than 1 if the activity of water is 1?

Now, I am quoting Chemlibretexts when they give the activity coefficient of $\ce{LiCl}$ to be $\pu{1.026}$ at the molality of $\pu{2.5 mol kg-1}$ For simplicity, assuming this is aqueous, I'll just ...
1 vote
1 answer
63 views

Salt solubility and solvent dissociation

A textbook, describing a qualitative test for the $\ce{Al^3+}$ cation in which you use $\ce{NH4Cl}$ and $\ce{NH4OH}$ to precipitate $\ce{Al(OH)3}$, mentioned that the solubility of this precipitate ...
  • 1,086
1 vote
1 answer
202 views

Hydration vs Dissolution

While revising Thermodynamics and Thermochemistry from revision material published by Arihant publications I encountered the following mentioned statement. During dissolution, the physical state of ...
1 vote
1 answer
832 views

Finding mass percent through molality of potassium nitrate solution

Question An aqueous $\ce{KNO3}$ solution has a molality of $\pu{4.16 m}$ and a density of $\pu{1.08 g/mL}$. Calculate the percentage by mass $\ce{KNO3}$ of the solution. My Approach I know that ...
's user avatar
1 vote
0 answers
23 views

Are there any tests which distinguish between triglycerides and polar lipids/impurities that can be conducted in a high school setting?

I am currently writing a research essay about using a mixed polar (methanol) and non-polar (heptane) solvent system to extract oil from mango seed kernels. One of the difficulties of using polar ...
0 votes
1 answer
125 views

Calculation of concentration at equilibrium for extraction

The equation for equilibrium of solvent-solvent extraction is: $$\ce{PhOH(toluene) <=> PhOH (aq)}$$ An aqueous solution contain $\pu{1.5 \times 10^{-2} M}$ phenol and is shaken with the same ...
  • 419

1
2 3 4 5
8