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For questions regarding the separation process consisting in the separation of a substance from a matrix. This tag can be used for generic extraction of elements from ore or more specific types of extraction such as: liquid-liquid extraction, and solid phase extraction.

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47 views

How to without calculations understand the liquid-liquid extraction efficiency?

I'm asking myself this question for a very long time and I haven't found a simple an good explanation yet for the fact that it's better (if you want to clean them) to wash your hands two times with ...
-1
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1answer
49 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 ...
0
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1answer
217 views

When using a “dilute hydrochloric acid” solution, how diluted should it be?

Quite often when reading through some instructions or documentation or an outline that I've found online (EG: acid-base extractions), theres a step that involves using a "dilute hydrochloric acid ...
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1answer
28 views

3,4-Methylenedioxyamphetamine (MDA) basic extraction

At my lab we perform a basic extraction of seized MDA with $\ce{NaOH}$ $\pu{2M}$ prior to GC/MS analysis. $\ce{MDA + NaOH -> MDA- + Na+ + H2O}$. This reaction should favor the products since $\...
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1answer
512 views

Extraction of citric acid from lemon [closed]

Now i am extracting citric acid from lemon juice and i have a problem in adding sulphuric acid to calcium citrate because i don't know how to calculate the proper amount sulphuric acid to add to ...
0
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1answer
80 views

Last step of nicotine extraction using DCM

After using hydro-distillation method with distilled water and NaOH, separating the extract with dichloromethane, distillate it at 40 °C/104 °F, I'm left with some yellow pale oil. I'm just wondering ...
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1answer
38 views

Will piperine endure heating for several days of soxhlet extractions?

I'm extracting piperine for use with curcuminoid supplements using a soxhlet apparatus and 91% isopropyl alcohol. My first extraction is right about done but I still need to do two more because of the ...
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0answers
46 views

How to determine crown ether cavity size? [closed]

I want to determine the cavity radius/ dia of crown ether. Which technique should I follow?
2
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1answer
60 views

Using drip extraction, how much caffeine is extracted from coffee as a function of the amount of water used?

When using a drip coffee maker, there are basically two choices we make: the amount of water and the amount of coffee grounds. If we use the same amount of coffee grounds but double the water, how ...
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1answer
363 views

How to choose alcohol solvent for organic extraction?

Assuming I have an organic substance that is known to be "soluble in alcohol" (e.g. capsaicin) I want to extract, which alcohol should/can I use? I know that both ethanol and methanol are commonly ...
6
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1answer
405 views

Why is ZnO reduced in this reaction?

Consider the following Ellingham diagram. At 673K, the Gibbs energy value of oxidation of Zn is more negative than the Gibbs energy value of oxidation of C (coke). So, Zn should be oxidised to ZnO. ...
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0answers
50 views

Does the yield of extraction of trimyristin depend on the color of grounded nutmeg?

I isolated trimyristin crystals from four different nutmeg sources. Grounded nutmeg seed is light brown colored. From the experiment, we draw the conclusion that the lighter the nutmeg is colored, the ...
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0answers
43 views

Is it easier to extract CO2 from seawater than from air?

It takes some effort to extract $\ce{CO2}$ from air in order to produce synthetic and potentially 'green' fuel. Doesn't seawater provide this environmental $\ce{CO2}$ more easily?
2
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0answers
93 views

Process Chromatography vs Solid Phase Extraction techniques

Process Chromatography is typically performed by flowing eluent from the top to the bottom of the column. The standard method of solid phase extraction at industrial scale e.g. to extract natural ...
1
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1answer
214 views

remove inhibitor from monomer

I am working with a commercial monomer (monomethacryloxypropyl terminated polydimethylsiloxane) with an inhibitor of BHT @1%. I need to remove it for making an ATRP reaction. What is the good way to ...
2
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1answer
148 views

Zinc Sulfate Purification

In the process for electrolysis for zinc, three things must be done: Leaching the ZnO Purifying the ZnSO4 by means of cementation Performing the electrolysis However, step 2, as it is presented by ...
4
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1answer
178 views

How can I free base cystamine dihydrochloride?

I am using cystamine (free based) to conjugate to a phosphate group on an oligonucleotide. I tried several keyword searches on Google for neutralizing the dihydrochloride at the ends of the cystamine. ...
0
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0answers
28 views

History of methods for extacting zinc from ore

Zinc is commonly found naturally as zinc sulphide. The process of extracting this zinc from the ore seems to be an ancient one. Have there been any changes in the methods for extracting zinc from ore ...
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0answers
36 views

What is the best way to illustrate the recovery of an extraction method?

I'm currently working on PFAS (perfluoroalkyl compounds) extraction from soils and their analysis by HPLC-MS/MS. I wonder what kind of graph can be the best to illustrate the recovery of the method. ...
5
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1answer
196 views

When are all cannabinoids infused into grape seed oil using non-decarboxylated, dried plant matter? [closed]

I am unsure which is the correct terminology, infusion or extraction? For all practical purposes I will continue using infusion here. (What is the difference between the two?) When making the ...
5
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1answer
1k views

Increasing partition coefficient in an extraction

My friend had this homework question about supposing you had a slightly polar organic compound in an ether/water extraction with a partition coefficient in favor of ether. The question was: What ...
0
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0answers
47 views

Selective Salt Extraction

I have a mixture of compounds that have a very large amount of NaCl dissolved after pH neutralization. The reaction I'm attempting is to conjugate a quinolone variant to a macrocylic via the formation ...
5
votes
1answer
153 views

Folin–Ciocalteu formula

I am searching a long time now. I have a question about the Folin–Ciocalteu formula for quantification of polyphenol. How is the $62.5$ in the equation explained? Where does it come from? This is the ...
0
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1answer
49 views

Phosphate extraction from sewage

I read that phosphate reserves will exhaust in coming years wiki, why don't we extract it from sewage , is it really that difficult to extract phosphate ?
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0answers
194 views

Methods to extract sucrose from tea after it's been stirred in?

Sugar is often labelled "white poison" now-a-days and a lot of negative health consequences happen due to increased sugar consumption. Keeping this in mind, if I were handed a cup of tea (with sugar ...
0
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1answer
439 views

When recovering Copper from Copper Chloride via Aluminum, why can't we use Sodium instead to make Sodium Chloride?

About a week ago in my Middle School Science Class, we used an aluminum washer and some copper chloride, which we had gotten from creating circuit boards, in a closed system to recover the copper (if ...
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1answer
3k views

What is the best way to evaporate toluene? [closed]

I decided to use toulene as my non-polar solvent because it's easy to get it. My question is, what is the best way to evaporate the toluene from the soaked organic material?
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1answer
468 views

Can I use gasoline as a non-polar solvent?

I was wondering if I can use gasoline for a non-polar extraction of organic substances instead of prescribed diethyl ether, which is a bit hard to get in my country. If not, are there any products ...
5
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0answers
95 views

Where is my antimony going?

I work in a trace metals laboratory operating an ICP-OES. I've been having some trouble with the recovery of antimony in a weak $\ce{HCl}$ solution post-digestion. The antimony is part of a mix of ...
0
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1answer
278 views

How to calculate the remaining mass in the mother solution after multiple extractions? [closed]

During an extraction, a solute ($\ce{S}$) will partition itself between the two solvent phases with a partition coefficient ($K$) defined as: $$\ce{S(solvent 1) <=> S(solvent 2)}$$ $$K = \frac{...
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1answer
232 views

Separation techniques for different organic compounds

Select the best (most appropriate, easiest, fastest) separation technique for each pair of compounds shown below: Separation techniques: evaporation under reduced pressure column ...
0
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1answer
2k views

What are potential sources of low recovery in this acid-base extraction experiment?

I did an acid-base extraction experiment. First extracted a solid mixture containing benzoic acid, p-nitroaniline, and naphthalene into three separate solutions: NaOH extract, HCl extract, and organic ...
0
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1answer
3k views

Magnesium Sulfate (MgSO4) back to Magnesium Oxide (MgO) + Sulfuric Acid (H2SO4)?

Is it possible to go back from magnesium sulfate ($\ce{MgSO4}$) to magnesium oxide ($\ce{MgO}$) and sulfuric acid ($\ce{H2SO4}$) ? How difficult or easy would it be? The reason I ask is because ...
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1answer
336 views

Extract ammonium sulfate from water

What is the best method to extract ammoniumsulfate from water? The assignment is as follows: Manure is being processed and the product left is a mixture between water and ammonium sulfate, ...
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1answer
447 views

Neutralising sulfuric acid but not boric acid

I have another question here which refers to me asking how to separate boric acid from other compounds, and this is partially a follow-up. Suppose I was to go down the route of making boric acid by ...
2
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0answers
75 views

Chile 2017, One of the Largest Fires in South America: Wood Ash Derivates for Industrial Applications [closed]

Hi: We're a group of people who wants to help people, domestic animals and wildlife recovering from this fire. Summary: We're having in Chile one of the largest fires in South American history. More ...
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3answers
768 views

Separating boric acid from sodium chloride

I want to create some boric acid with borax in the following reaction: $$\ce{Na2B4O7·10H2O + 2 HCl → 4 BH3O3 + 2 NaCl + 5 H2O}$$ However as you can see, the leftover solution will contain a mixture ...
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0answers
181 views

Processing Chitosan from Crab Shell

I am trying to extract chitosan from crab shell (Japanese snow crab). I want to dissolve chitosan in water and mix in gelatin to obtain some type of gel, that I would then test for my Master 2 ...
0
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1answer
268 views

Why are the nitrate salts hygroscopic?

Any metal is never extracted from its nitrate salt because nitrate salts are highly soluble in water, so flow away along with rainwater, or any other source. But why are the nitrate salts so ...
3
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3answers
79 views

Extracting iron oxide from ceramics waste

In my ceramics class, we use iron oxide in our glazes, but a lot of it goes to waste. We have a bucket full of scrap glaze which contains quite a lot of iron oxide, but is also mixed in with silica, ...
6
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1answer
958 views

Extraction of monosodium glutamate (MSG) from kelp

What is the extraction process of monosodium glutamate (MSG) from kelp? How could one do this at home? Is there a specific kelp species to use?
0
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1answer
579 views

Does limonene react with calcium hydroxide or acetic acid?

I can't find the results of too many experiments with Limonene. Which has many uses (e.g. making soap). I'm curious of the results of combining Limonene and Calcium Hydroxide (Lime) in one ...
0
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2answers
152 views

Determining Charge of Protonated Alkaloids

During the extraction of many alkaloids, you lower the pH in order to protonate the compound, making it polar and water soluble. With Mescaline, you must precipitate it as a salt. What I don't ...
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0answers
669 views

Potassium chloride reaction into Potassium metal

Is there a simple reaction possible for the extraction of potassium metal from potassium chloride? I've tried exploiting its solubility in water, separating the potassium from the chlorine and ...
4
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1answer
462 views

General Alkaloid Extraction Process

I'm getting into alkaloid extraction from various ethnobotanicals. It is a bit frustrating trying to extract alkaloids from ethnobotanicals without good guides out there, and I wanted to make my own ...
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0answers
302 views

Caffeine extraction

I'm working on a caffeine extraction experiment, using dichloromethane and instant coffee. I am testing how the amount of caffeine extracted from coffee will be affected when different concentrations ...
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2answers
102 views

lindane extraction from aqueous solution using hexane

I am studying the degradation of lindane using iron nanoparticles. I have prepared lindane solution with an acetone and water mixture (1:9 v/v). I tried to extract lindane after reaction with ...
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1answer
814 views

How to extract thymol from oregano leaves?

This is my second graders in highschool project of science report. I try to a make natural hand sanitizer using thymol from oregano leaves as the antiseptic ingredient instead of alcohol. I want ...
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1answer
1k views

Sublimation and recrystallization of caffeine

I'm looking to do an extraction of caffeine from energy drinks. I want to use both sublimation and recrystallization in my experiment for advanced purity. My question is which should happen first, ...
5
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2answers
732 views

Froth floatation process - why CuSO4 is activating floating character of ZnS?

I read the following : "In a mixture of $\ce{PbS}$, $\ce{ZnS}$ and $\ce{FeS2}$, each component is separated from each other in froth floatation process by using the reagents potassium ethyl ...