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18 votes
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What is the scientific term to describe the operation of a bong?

I think the term describing the initial process of separation of the solid phase (dust particles) from the gas phase via bubbling is a wet scrubbing process. On an industrial scale, it's more ...
andselisk's user avatar
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15 votes

How to separate Cu and Ni from alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn < 5%)?

First, the alloy $(0.5$ to $\pu{2 g})$ should be treated by $\pu{10 mL}$ nitric acid $32\,\%.$ All metals will get dissolved, except tin and silicon, which will be transformed into insoluble dioxide $\...
Maurice's user avatar
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8 votes
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How do I separate an Indium-Gallium alloy into Indium and Gallium?

The Gallium-Indium binary system is assessed by Bridget C. Rugg and Tim G. Chart in Calphad 14(2) 115-123 (1990). It is a very simple system, exhibiting essentially no solubility of In in Ga, and ...
Jon Custer's user avatar
  • 8,599
8 votes

Can I separate paint thinner into acetone and toluene by simply boiling it?

Your logic of separating the acetone from toluene by distillation is reasonable, and would work well for separating many substances, such as propane from water (e.g., at a gas well). However, the ...
DrMoishe Pippik's user avatar
8 votes
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Meaning for chromatography terms linear velocity and volume flow rate

Linear velocity and volumetric flow rate are easy to understand, both indicate how fast things are moving in a separation column, but I have to agree that the term "linear" velocity can be ...
AChem's user avatar
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7 votes
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What is the correct unit of a RI detector used for HPLC analysis?

Good question. Now that you have mentioned the instrument name (Agilent 1260 LC), it is easy to locate Agilent's "Refractive Index Detector Agilent InfinityLab LC Series User Manual." It is ...
AChem's user avatar
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6 votes
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How to separate two liquids with both having the same properties?

Typical vegetable oils are not just one chemical compound, but a mixture (after removing everything that is not) of glyceride triesters. The chance that there is some overlap between your two oils is ...
Karl's user avatar
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6 votes
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Separating glucose and fructose

The most common industrial method is one of various types of liquid chromatographies, which is usually how glucose-fructose solutions are enriched in fructose. I did see a couple other possible ...
Michael DM Dryden's user avatar
6 votes

Has anyone added dyes to a mixture about to separated by chromatography in order to visualize where the desired product lies?

the idea is good for academic purposes and good for a lecture hall demo. One may also try a UV lamp, if your compound fluoresces in the column. Caution UV is very harmful for the eyes (protective ...
AChem's user avatar
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6 votes
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How can I read an Anschütz/Bennert manometer and how can I make sense of it?

All operations should be gentle: open the valve to the system evacuated if the vacuum applied is good enough, the level of mercury in the right hand (open) leg rises, the level in the left hand (...
Buttonwood's user avatar
5 votes
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How to remove sugar from juice

A blueberry contains ~85% water, 5% glucose, and 5% fructose (and it is generally considered a low glycemic index food, see e.g. this site). The solubility of fructose in water is extremely high (...
Buck Thorn's user avatar
  • 22.1k
5 votes

etymology of supernatant

It means "the liquid that swims above", from the Latin terms super = above and natare = to swim. So it is the liquid that remains on top. The subnatant would be the liquid at the bottom, in case you ...
Raoul Kessels's user avatar
5 votes

How can I separate these two alcohols from each other out of the aqueous solution?

I am tasked with separating these two compounds. If you want to keep both compounds, degrading one of them is obviously not an option. They are both solvated in water. This can be changed - ...
Klaus-Dieter Warzecha's user avatar
5 votes
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Separating lanthanides using ion-exchange method

You must be reading this from really old ion exchange references. It is always good to mention the resources and references for other readers. Ion-exchange retention can be very roughly approximated ...
AChem's user avatar
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5 votes
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Why does HgCl2 react with HCO3^- but not with CO3^2-?

Anirudh, which book is teaching this stuff? Sorry, I can only find this discussion in 1890s and the latest in my favorite Mellor's Treatise from 1930s. Coming to 2020: After doing a simple acid ...
AChem's user avatar
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5 votes

How to separate a mixture of sodium chloride and sodium hydroxide?

Hans' idea (evaporation + filtration) is not easy to carry out in practice. Concentrated $\ce{NaOH}$ solutions are extremely viscous, and if they are mixed with $\ce{NaC}$l crystals, they cannot be ...
Maurice's user avatar
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5 votes

What is the function of thin layer in thin layer chromatography?

If you recall Tswett's original discovery of chromatography, he used a calcium carbonate column to separate the chlorophyll pigments (or different types of chlorophylls). Now calcium carbonate is a ...
AChem's user avatar
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5 votes
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Why does a big protein move during gel electrophoresis but to a lesses extent through a size exclusion column?

In the polyacrylamide gel, there is no way to avoid the narrow passages. The gel is made in situ by a chemical crosslinking step. In size exclusion, the solid phase is made of beads with diameter ...
Karsten's user avatar
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5 votes
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Can I separate paint thinner into acetone and toluene by simply boiling it?

The paint thinner may contain some additives other than the two solvents, but a possible separation could be made by adding water. Acetone is completely miscible with water at all ratios; toluene is ...
James Gaidis's user avatar
4 votes
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How viable is production of magnesium oxide and sulfuric acid from Epsom salt?

Yes, at 1124 °C magnesium sulfate decomposes to magnesium oxide without melting producing sulfur trioxide as the side product. [1] Magnesium sulfate can also be reduced to magnesium oxide using a ...
Nilay Ghosh's user avatar
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4 votes
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What is the state of stationery phase in paper chromatography?

It's a bit of both, actually, and also ion-exchange chromatography. The cellulose and other components of paper do exhibit adsorption and ion exchange properties with some analytes, but as paper ...
Michael DM Dryden's user avatar
4 votes
Accepted

Using cryptands to make a negatively-charged solution?

For some reason this question reminds me of Maxwell's demon paradox. You don't really separate anions and cations here; in reality the resulting metal ($\ce{M+}$) cryptand ($\ce{L}$) complex is going ...
andselisk's user avatar
  • 38k
4 votes
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Recover Solder (Sn-Pb) from wires

Unfortunately the reason solder works is that it partially dissolves copper as shown in Figure 1 to form $\ce{Cu3Sn}$ and $\ce{Cu6Sn5}$ phases (also known as bronze) shown in Figure 2. Because of this ...
A.K.'s user avatar
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4 votes
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Do companies recover carbon dioxide and water from the purification step of cryogenic air separation, and how?

It is unlikely that this is an economically feasible $\ce{CO2}$ recovery method, which means commercial gas producers probably don't bother to isolate $\ce{CO2}$ this way (surely not water). The ...
Buck Thorn's user avatar
  • 22.1k
4 votes

HPLC Columns For Compounds Not Soluble In Non- Or Low Polar Solvents

Try searching Google Scholar and write HPLC separation and the names of your compounds. You will find plenty of publications and of course column names. If your compounds are new, you should test the ...
AChem's user avatar
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4 votes
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Separating sodium sulfate from chromium trioxide solution

The overall reaction is: $$\ce{H2SO4 + Na2Cr2O7 → 2 CrO3 + Na2SO4 + H2O}$$ How to separate chromium trioxide and sodium sulfate from solution? Since chromium trioxide is soluble, it exist as chromic ...
Nilay Ghosh's user avatar
  • 25.9k
4 votes

How to make acetic acid more volatile so that it can be removed by vigorous aeration of an acetic acid-water mixture?

Aeration does not seem to be the way to go. If there are no other ions in the water, electrolysis (Kolbe reaction) would convert the $\ce{HOAc}$ to ethane and carbon dioxide: $$\ce{2CH3CO2^- -> 2e^-...
James Gaidis's user avatar
4 votes

How to separate a mixture of sodium chloride and sodium hydroxide?

One solution would be to reduce the amount of solvent (under vacuum for instance), then filter out the precipitated NaCl at high temperature (at higher temperatures NaOH has as much as >10x the ...
Hans's user avatar
  • 1,097
4 votes

How are Silanol groups functionalized unto mesoporous silica structures?

The bulk of silica is indeed silicon dioxide, but at surface there is a discontinuity. The dangling O, exist as OHs, as silanols. Therefore silica surface itself is full of silanols, which are used ...
AChem's user avatar
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4 votes
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Is Silica Gel fit for Ultra-High Dessication?

Silica gel is really one of the best desiccants known. But it has to be thoroughly dehydrated at high temperature. Usually silica gel contains a small amount of cobalt chloride $\ce{CoCl2}$ : blue ...
Maurice's user avatar
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