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Learn useful chem techniques from MIT videos

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SWIMfriend

SWIMfriend

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Here is an absolutely FIRST CLASS set of videos for learning important chem lab techniques. The 20 minute video "Recrystallization" is invaluable for spice ultra-purification considerations. "Reaction Workup I" will give understanding of the wash steps of extractions.

Seriously recommend this is made sticky...
 
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SWIMfriend said:
Here is an absolutely FIRST CLASS set of videos for learning important chem lab techniques. The 20 minute video "Recrystallization" is invaluable for spice ultra-purification considerations. "Reaction Workup I" will give understanding of the wash steps of extractions.

Seriously recommend this is made sticky...
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What a great resource to get some basic chemistry knowledge, thanks for poasting!
 
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The link seems to be dead... I get the following error

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Error>
<Code>NoSuchKey</Code>
<Message>The specified key does not exist.</Message>
<Key>largefiles/resources/chemvideo/index.htm</Key>
<RequestId>3B30FE9A46DC250D</RequestId>
<HostId>pxZpSiW7724KSrkYJlCgpnRjAMaSQY+3l1oOPNnAyKupGATcXG0u7G54wMJ3HCsYvza9o9kMzfA=</HostId>
</Error>
 
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I don't see any link in the original post. I am going through MIT's principles of chem (6.111) course (for general learning; I'm brushing up before I take the classes formally) and it is an absolutely brilliant resource. Their website offers almost every class you could take there, for free, and most of them include the syllabus, handouts, homework assignments, exams, etc.


:thumb_up:
 
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Spiralout said:
I don't see any link in the original post. I am going through MIT's principles of chem (6.111) course (for general learning; I'm brushing up before I take the classes formally) and it is an absolutely brilliant resource. Their website offers almost every class you could take there, for free, and most of them include the syllabus, handouts, homework assignments, exams, etc.


:thumb_up:
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ohh would you post? it seems the original link is indeed no longer available :p
 
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Been searching for DMT solubility data but with no luck. Want to do some recrystallisation/purification, but as per the MIT video, have no way of finding which, if any, solvent DMT is far more soluble in when it is warm.
I have some heptane, so should I just dissolve my spice in the minimal amount, filter and then evaporate?
Help gratefully received!
 
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OrangeEnergy said:
Been searching for DMT solubility data but with no luck. Want to do some recrystallisation/purification, but as per the MIT video, have no way of finding which, if any, solvent DMT is far more soluble in when it is warm.
I have some heptane, so should I just dissolve my spice in the minimal amount, filter and then evaporate?
Help gratefully received!
Click to expand...

Solubility:

boiling Naphtha (80 °C, C6-C7, 60-80 °C)
"infinite"
(the DMT will melt and just create a homogeneous liquid-liquid solution. In the end it may even be a solution of Naphtha in DMT)
Example: In just 5 ml of boiling Naphtha you could easily add 4 g of DMT, while only doubling the initial volume. No precipitation would ever show off.

Naphtha (20 °C, C6-C7, 60-80 °C)
29,3 g in 1 L
2,93 g in 100 ml

Naphtha in the freezer (-20 °C, C6-C7, 60-80 °C)
1,09 g in 1 L
109 mg in 100 ml

boiling n-Hexane (69 °C)
"infinite"
(same as above for Naphtha)

n-Hexane (20 °C)
7,7 g in 1 L
770 mg in 100 ml

n-Hexane in the freezer (-20 °C)
825 mg in 1 L
83 mg in 100 ml

Here 2 additional Hydrocarbons:

n-Pentane in the freezer (-20 °C)
501 mg in 1 L
50 mg in 100 ml

n-Heptane in the freezer (-20 °C)
916 mg in 1 L
92 mg in 100 ml

From this post:
 
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birdsarenotreal said:
OrangeEnergy said:
Been searching for DMT solubility data but with no luck. Want to do some recrystallisation/purification, but as per the MIT video, have no way of finding which, if any, solvent DMT is far more soluble in when it is warm.
I have some heptane, so should I just dissolve my spice in the minimal amount, filter and then evaporate?
Help gratefully received!
Click to expand...

Solubility:

boiling Naphtha (80 °C, C6-C7, 60-80 °C)
"infinite"
(the DMT will melt and just create a homogeneous liquid-liquid solution. In the end it may even be a solution of Naphtha in DMT)
Example: In just 5 ml of boiling Naphtha you could easily add 4 g of DMT, while only doubling the initial volume. No precipitation would ever show off.

Naphtha (20 °C, C6-C7, 60-80 °C)
29,3 g in 1 L
2,93 g in 100 ml

Naphtha in the freezer (-20 °C, C6-C7, 60-80 °C)
1,09 g in 1 L
109 mg in 100 ml

boiling n-Hexane (69 °C)
"infinite"
(same as above for Naphtha)

n-Hexane (20 °C)
7,7 g in 1 L
770 mg in 100 ml

n-Hexane in the freezer (-20 °C)
825 mg in 1 L
83 mg in 100 ml

Here 2 additional Hydrocarbons:

n-Pentane in the freezer (-20 °C)
501 mg in 1 L
50 mg in 100 ml

n-Heptane in the freezer (-20 °C)
916 mg in 1 L
92 mg in 100 ml

From this post:
Chemical Guide to classic Psychedelics (DMT, 5-MeO-", Mescaline, Harmalas, Salvinorin A, ...) - Advanced/Enhanced chemistry - Welcome to the DMT-Nexus
Click to expand...

Great. Thanks.
 
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SWIMfriend said:
Here is an absolutely FIRST CLASS set of videos for learning important chem lab techniques. The 20 minute video "Recrystallization" is invaluable for spice ultra-purification considerations. "Reaction Workup I" will give understanding of the wash steps of extractions.

Seriously recommend this is made sticky...
Click to expand...

Link seems to be out of date or has moved.


Edit. Ah sorry issue has already been raised. I read the top of the post, clicked the link then posted a reply before reading the thread. Admins please delete.
 
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