Questions tagged [separation-techniques]

For questions about the separation of mixtures and solutions into pure compounds

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Hypothetically, can sufficiently powerful centrifugation separate normally miscible chemicals of differing densities?

Centrifugation is used to separate phases in suspensions by density. I read that this is not possible with colloids and solutions, but the distinction between the three seems to be optical properties ...
BatWannaBe's user avatar
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How to separate two liquids with both having the same properties?

I was curious if it was possible to separate such liquids e.g. two vegetable oils that happened to have different ingredients, so it is a different liquid, but the same density etc.
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How to make acetic acid more volatile so that it can be removed by vigorous aeration of an acetic acid-water mixture? [closed]

I want to remove acetic acid from a mixture of acetic acid and water by aeration. The concentration of acetic acid is 200 ppm (mg/L). The pH of the water is more than 5. I want to reduce the acetic ...
Chandrashekhar's user avatar
1 vote
1 answer
239 views

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

I just learned about the thin layer chromatography, which I think is basically the same as the paper chromatography. I am wondering what is the function of the thin layer? I mean, what's special about ...
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How can I separate these two alcohols from each other out of the aqueous solution?

I have the following question for homework and am stumped. I am tasked with separating 3-(2-methoxyphenoxy)propane-1,2-diol and (1​R,2​S)-2-(methylamino)-1-phenylpropan-1-ol. They are both solvated in ...
liquidcrawler's user avatar
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2 answers
1k views

Can separated and purified substances be obtained from a chromatogram?

I am studying chemistry, and I am learning about chromatography. But I am confused about how chromatography is used to ‘separate and purify’ substances. I have learnt about chromatography paper, ...
Aryan Beezadhur's user avatar
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2 answers
108 views

How do you get contents of large flask into a smaller separatory funnel?

Separatory flasks that I use have a ground glass joint, but it is not clear how that joint is to be used. Videos I have seen just show people pouring stuff into the throat of the funnel. Normally the ...
Shaka Boom's user avatar
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1 answer
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How to interpret gas chromatography results?

I am having trouble interpreting gas chromatography (GC) results for the production of ethyl acetate from acetic acid and ethanol. I am trying to find the reaction order from these results, as well as ...
pulsewidth's user avatar
1 vote
2 answers
177 views

How does industry separate glucose from fructose using liquid chromatography when producing high-fructose corn syrup?

Can someone explain how the separation of glucose and fructose is achieved using liquid chromatography in the industrial production of high-fructose corn syrup? I've seen references to ion-exchange ...
vossman77's user avatar
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How does a freeze-thaw cycle separate a mixture?

Imagine that I defrost a tube of serum (only the yellow stuff, with blood cells removed) standing still and upright in ambient air. I have seen that as it defrosts the sample separates into different ...
Mikkel Rev's user avatar
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1 answer
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Steam distillation vs fractional distillation

I am a high school student and I am a little confused in the techniques used to purify organic compounds. For example, in steam distillation we reduce the external pressure on the compound to be ...
Arun Bhardwaj's user avatar
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1 answer
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Theoretical plates in Plate theory of chromatography

In "Chromatography theory" by Scott and Cazes, The plate volume is given as ($v_m+Kv_s$) where $v_m$ and $v_s$ are the volume of stationary and mobile phase in the column and $K$ is the ...
Manu's user avatar
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How to store small amounts of gas

I need to store small amounts of gas. I already saw devices that look similar to the image below, but I don't know how they are called. Does someone here know how these devices are called? I am also ...
Efrischungsgetränk's user avatar
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Separation of methyl acrylate from ethanol

I have liters of ethanol contaminated with methyl acrylate (MA) from cleaning UV resin 3D prints. Is there an easy way to purify this ethanol by separating MA (as unwanted product) from it? ...
Tom's user avatar
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My particles won’t separate without neutralizing the solution. I want to understand why?

I etched active carbon with a concentrated KOH solution and added HCl to neutralize the KOH. Separeted the particles with centrifuge at 4000 rpm. They should be micron sized. My boss asked me to stop ...
marietiara's user avatar
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are refractometers generic?

I need to check the presence (and also purity approx) of a substance in solution. I have a very good reference (10mg/1ml - the substance in water). Can I use a refractometer to do this? I am trying to ...
user1683285's user avatar
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Protein purification pressure limits confusion, about the X-MPa limit for FPLC?

I have always been a bit confused about column pressure limits. I have to elaborate a bit on the problem to get to my question: In protein purification we use the äkta purification machines (e.g. ...
CuriousTree's user avatar
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Removing chloride ions from humic acid purification

I used HF and HCl in humic acid purification, and now I need to remove the Cl ions from solution. What should I do to remove the Cl ions? Do I just wash it with distilled water, or is there another ...
jawad ali's user avatar
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1 answer
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Why does a big protein move during gel electrophoresis but to a lesses extent through a size exclusion column?

A big protein going through gel electrophoresis will be forced through the gel, it will drift a small way and will show on the top of the gel, while in size exclusion, the big protein is not forced to ...
yahel abraham's user avatar
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1 answer
388 views

How to separate a racemic mixture of 1,2-diols

[upjohn dihydroxylation]2I want to ask that i synthesise R-substituted-1,2-Diol with (ee=1:1) ratio of R-, S- with the help of Upjohn Dihydroxylation. i try to seprate it by different mobile phasese ...
Dr.usama farooq's user avatar
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1 answer
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What matters for ion exchange: net or local charge?

I am interested in separating two small organic molecules by ion exchange chromatography. Following the example set by several old papers for these molecules, I want to use a cation exchanger. Both ...
Mowgli's user avatar
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1 answer
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How to separate the salts within homemade sea salt

Goals There are a few things that I'm looking to do: Separate salt from seawater via some evaporation technique. Separate the each of the major salts from the resulting sea water to get each into ...
Mailbox's user avatar
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When creating a separation method in gas chromatography, calibration with compounds mixture or for each separate component?

When creating a separation method in gas chromatography, is there any difference between the calibration with the compounds mixture and the calibration for each separate component? I have 5 components....
DiMorten - Jorge Chamorro's user avatar
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Calculation of the Seperation factor of Ethanol / Water rectification based on two saturated vapor temperatures

I want to calculate the efficacy of a Water / Ethanol rectification based on two temperatures with help of a vapor-liquid equilibration diagram. The first temperature is measured right above the ...
Neidi's user avatar
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How to remove oil/grease contaminant from an aqueous solution?

I have a solution of water and calcium nitrate that is contaminated with some sort of heavy petroleum oil, semi-solid at room temperature a bit like petroleum jelly, and a strong odor of very crude ...
Max Power's user avatar
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Dynamic viscosity of gas mixture (appropriate estimation)

What estimation of the dynamic viscosity $\eta = f(T)$ $([\eta] = \pu{Pa·s})$ of the gas mixture components would you recommend during adsorption at a low temperature, approx. $\pu{293 K}$ to $\pu{333 ...
Josh E.'s user avatar
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Solubility Product, and it's relation to solubility

In order to remove temporary hardness of water, it is boiled. On boiling, while Ca(HCO3)2 gives CaCo3(ppt.) , Mg(HCO3)2 gives Mg(OH)2(ppt.). According to my book precipitation of Mg(OH)2 occurs due to ...
JKR's user avatar
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What are some Qualitative test/s that you can use for benzophenone? [duplicate]

I have determined one of my unknowns to be benzophenone and in a lab setting (but that isn't possible because of COVID-19) I would conducted the 2,4 DNP test which should yield a positive result. ...
Boo's user avatar
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Method of separating product and conserving the catalyst

I'm looking for a way to separate reaction product of iodobenzene with ethyl 2-methyl-3-oxopentanoate in 1,4-dioxane (toluene is an alternative as a solvent). The catalyst being used is $\ce{Pd2(DBA)3}...
steve d.'s user avatar
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coffee concentrate and water separated after 2 hours. How/why?

I'm asking because this makes no sense to me and making sure I'm not stupid. I brewed 10 gallons of cold brew concentrate(TDS 12.2) and mixed it with 10 gallons of water. I moved 10 gallons of the ...
notnotderrick's user avatar
-1 votes
1 answer
173 views

Reasoning about a separation problem [closed]

Describe exactly how you would go about separating a mixture of the three water-insoluble liquids, aniline (b.p. 184 °C), n-butylbenzene (b.p. 183 °C) and n-valeric acid (b.p. 187 °C), recovering each ...
Knight wants Loong back's user avatar
-1 votes
1 answer
3k views

How would you separate sodium chloride and copper sulfate?

I've tried dissolving both compounds in water and evaporating the mixture, but this leaves a combination of brown and green crystals. Is there was any way to cleanly separate both compounds? Any ...
Allison's user avatar
-1 votes
1 answer
70 views

Separating 2 chemicals [closed]

Is it possible to separate two chemicals with slightly different melting points? Can this be done with the use of a lab freezer? As MP is -44 and The other is -61 - -59 °C. Will it solidify these ...
Mr G's user avatar
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-1 votes
3 answers
333 views

How to make clean water from urine in a wastewater treatment plant? [closed]

Referring to a video here, describing a filter that treats wastewater, wouldn't urine in the wastewater not get filtered out because a sand filter alone does not separate urine from water? How is ...
jessica smith's user avatar
-1 votes
1 answer
61 views

How to separate manganese(IV) oxide and chromium(III) hydroxide?

I am trying to find a reagent that keeps either $\ce{MnO2}$ or $\ce{Cr(OH)3}$ solid and make other soluble so I can centrifuge or use filtration. I thought of $\ce{NaOH},$ but I could not find any ...
Jake's user avatar
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-1 votes
1 answer
96 views

Chromatography- why tM is separated from other peaks? [closed]

tM in Chromatography is the time of exist mobile phase. But, the mobile phase exist together with all the compunds that tasted in the process. So, why in the graph of signal to time we can see a peak ...
Liat's user avatar
  • 11
-1 votes
1 answer
766 views

What is the physical property used in choosing the separation techniques for CaCO3 and KCl and NH4Cl [closed]

I've been scrolling through a chemistry past question but when I came across this I tried to solve it but it keeps confusing me
Treasure's user avatar
-1 votes
1 answer
1k views

Titration/ Separating Soluble Salts/ NaHSO4

When performing titration between NaOH and H2SO4, both Na2SO4 and NaHSO4 are formed (both are soluble in water), is there any method to obtain crystals of NaHSO4? (Maybe by separating two soluble ...
Raymand Tey's user avatar
-2 votes
2 answers
149 views

How do we separate H2O from CO2? [closed]

Let's say I have a mixture of $\ce{CO2}$ and $\ce{H2O}$ gases. I've read that $\ce{CO2}$ is heavier (molar mass is $\pu{44.01 g/mol}$) than $\ce{H2O}$ (molar mass is $\pu{18.02 g/mol}$). So, if the ...
Ishaan Manish's user avatar
-2 votes
1 answer
854 views

Reaction between HCl and NaHCO3 [duplicate]

I want to know why in the reaction between HCl and NaHCO3, we have CO2 and H2O instead of H2CO3 ?
Negar's user avatar
  • 1
-3 votes
2 answers
415 views

How would I separate a solution of sodium iodide and water in order to obtain the sodium [closed]

I am an amateur in this field of science and I am trying to separate a solution of Sodium Iodide and water. How would I separate the solution so I can obtain sodium?
diderstar's user avatar
-3 votes
1 answer
126 views

How can titanium be separated from magnesium by washing?

I saw this question in a GCSE past paper: After this reaction, there is a mixture of the solids magnesium, titanium and magnesium chloride. Titanium does not react with dilute hydrochloric acid. ...
Chris's user avatar
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-4 votes
1 answer
42 views

Separation of benzoic acid and naphthalene from its mixture [closed]

The best method for the separation of naphthalene and benzoic acid from their mixture ? a)chromatography b)crystallization c)distillation. d)sublimation many sources says answer is crystallization ...
Ataraxia's user avatar
-4 votes
1 answer
37 views

Separation methods [closed]

I put some iron nails in water, and obviously, those started oxidizing, making those hydrogen bubbles. Some days after, the water was orange, indicated that the FeO has just dissolved in it. I found ...
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