All Questions
Tagged with extraction acid-base
16
questions
3
votes
0
answers
48
views
TsOH and 5% NaHCO3 Interaction: Unexpected Dark Green Color
Here's the brief:
I synthesized alkyl gallates (ethyl gallate, butyl gallate, and amyl gallate) using Fischer esterification.
I used TsOH instead of concentrated H2SO4 as the catalyst.
After ...
- 155
1
vote
0
answers
105
views
How does pH affect an extraction problem
I am not sure how to understand when pH will affect a given problem regarding extraction. For example, in a problem given that K$_D$ of the reaction is $1.86$ I am asked to calculate:
(a) How much ...
- 1,095
1
vote
0
answers
55
views
BTX nitration work-up
I'm trying to understand washing step in a btx nitration process. In all these processes the work-up streams are very similar. The reaction mixture passes from the nitrator to a separator or ...
- 41
1
vote
0
answers
164
views
Primitive Technology - Production of NaOH
We need to produce NaOH with primitive Technology. This is Part 1 of my Gilligan's Island Challenge series (Part 2). You are stuck on an island with access to a beach, a forest, a river, a lake, and a ...
- 313
2
votes
0
answers
92
views
The effect of lactose monohydrate on acid-base extraction of tolterodine tartrate
I am doing an organic chemistry project for school in the form of an acid-base extraction of tolterodine tartrate (Detrol) in ammonium hydroxide (or sodium hydroxide, haven't decided yet) and ...
2
votes
1
answer
7k
views
Why is a weak base more able to deprotonate a strong acid than a weak acid?
Very basic question, but I'm rather confused.
Say I want to separate a carboxylic acid $(\ce{RCOOH},$ $\mathrm{p}K_\mathrm{a}~5)$ from a phenol $(\ce{ArOH},$ $\mathrm{p}K_\mathrm{a}~10)$ via acid-...
- 169
2
votes
1
answer
18k
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 ...
- 263
1
vote
1
answer
763
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 ...
- 119
0
votes
1
answer
10k
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
3....
- 31
2
votes
0
answers
271
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 ...
- 21
0
votes
2
answers
482
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 ...
- 327
1
vote
0
answers
445
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 ...
- 11
5
votes
2
answers
5k
views
Role of hydrochloric acid and sodium hydroxide in isolation of citric acid from lemon juice
I'm trying to extract citric acid from squeezed lemons.
After studying the subject, I found a lab manual [1, p. 68]:
ISOLATION OF CITRIC ACID
Reagents:
Lemon juice (ca. $\pu{100 mL}$ – 3 lemons)
$\...
- 51
1
vote
1
answer
5k
views
I am trying to find the solubility of benzoic acid in different solvents to prepare a liquid-liquid extraction
I need to prepare a liquid-liquid extraction using the partition coefficient (K) of benzoic acid in different solvents and water:
...
- 325
3
votes
2
answers
6k
views
What is purpose of sulfuric acid in iodine extraction?
I am trying to extract iodine from kelp following this guide here. It calls for sulfuric acid, but I don't see what this does do help the reaction. I thought the reaction was simply oxidizing iodide ...
- 521