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Questions tagged [separation-techniques]

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

4
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1answer
85 views

Recover Solder (Sn-Pb) from wires

I have began to do an "art project" which utilizes solder as main material. While I know that solder is cheap and easily found in multiple shops, I have set my mind on using recycled solder from out ...
3
votes
1answer
62 views

etymology of supernatant

Why do we call a solution that has been centrifuged a supernatant? It seems to me that a "natant" should be something that floats (from Latin "natare" meaning "to swim"), and a "supernatant" should be ...
3
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1answer
52 views

Using cryptands to make a negatively-charged solution?

In our discussion group, my friend mentioned that metal cations can be separated from other cations in solution using cryptands. After addition of the cryptands to the solution of the cations, ...
3
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1answer
56 views

Is the pressure in an HPLC system the same throughout?

I'm not sure if I'm articulating myself well enough, but here's my problem: I have a current HPLC system, where we typically have backpressure readouts of around 15 MPa. We are looking to get a new ...
3
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1answer
1k views

How to separate sodium carbonate from sodium hydroxide?

I got a drain cleaner in dust form, which consists of $\ce{Na2CO3}$ and $\ce{NaOH}$. I wanted to extract the $\ce{NaOH}$ so I tried to heat the mixture in order to just melt the sodium hydroxide, but ...
2
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1answer
183 views

Shea Stearin Extraction by Dry Fractionation

I have been able fractionate palm oil and extract palm stearin using the following method: Melt the palm oil (over 80 °C) Keep the melted oil at 33.5 °C for 24 hours (using an immersion circulated ...
2
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1answer
93 views

Separating specific components of a PUREX raffinate

The PUREX extraction in nuclear fuel reprocessing leaves behind a nitric acid raffinate full of (mainly) 'fission products', which are a diverse set of elements produced by fission in a nuclear ...
2
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0answers
28 views

What is the principle of “scrubbing” in liquid extraction or solvent extraction?

There are many steps in solvent extraction: Extraction Scrubbing Back extraction I understand the 1st and the 3rd. What is the principle of scrubbing? Is it just washing the organic phase? How ...
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2answers
79 views

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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2answers
327 views

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 ...
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0answers
32 views

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 ...
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0answers
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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 ...
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3answers
233 views

Why does a molecular sieve work for gas separation?

I was looking at membrane separation of air to nitrogen / oxygen and saw some details on the molecular sieve which on Wikipedia states you can get much higher purity from an adsorber / sieve, but when ...
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1answer
66 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 ...
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1answer
1k 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 ...
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1answer
53 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 ...
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1answer
348 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 ?
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0answers
39 views

when water and alcohol are mixed, why don't the boiling points change? [on hold]

when water and alcohol are mixed, why doesn't the boiling points change? The vapor pressure should increase so the atmospheric pressure will equal to the vapor pressure faster, how do alcohol and ...