Comments for Solubility in water and other solvents

Comment on what property of a particular solute towards a solvent is necessary for recrystillization to occur? by Drknow

Drknow — Mon, 06 Feb 2012 18:42:43 +0000

The best recrystallization solvent is one, in which a molecule has high solubility at high temperature and low solubility at low temperature.

As a result you can dissolve large amount of substance at high temperature. And when the solvent cools, the solubility of the substance decreases, leading to its precipitation.

Or in terms of bonding the intermolecular interactions between the molecules of interest much be stronger than molecule-solvent interactions.

Molecules-Molecule intermolecular interactions need to be stronger than the molecule-solvent interactions, such that the solvent cannot break the molecule-molecule interactions at low temperatures.

Molecule-Molecule interactions – should only be slightly higher, so when boiled in solvent, they break and molecules dissolve.

Comment on Organic chemistry: E2 reactions (8) by dansr4always

dansr4always — Mon, 06 Feb 2012 13:27:40 +0000

just wondering, so let’s say there was a methyl group on the alpha carbon as originally drawn instead of the deuterium. since we have a bulky base, we wouldn’t be able to use the more substituted beta carbon like we did in the video. would the reaction still happen/how would you draw the Hoffman product?

Comment on Organic chemistry: E2 reactions (8) by JRockey0915

JRockey0915 — Mon, 06 Feb 2012 13:08:47 +0000

There would just be a terminal alkene.

Comment on Can anyone help with biochemistry question on solvents and solutes? by MOZHIARASU

MOZHIARASU — Sun, 05 Feb 2012 21:14:15 +0000

Addition of ammonium sulphate, compresses the solvation layer and increases protein-protein interactions. As the salt concentration of a solution is increased, more of the bulk water becomes associated with the ions. As a result, less water is available to partake in the solvation layer around the protein, which exposes hydrophobic patches on the protein surface. Proteins may then exhibit hydrophobic interactions, aggregate and precipitate from solution.

Comment on Solubility Rules Song (Baby) by lotus2038

lotus2038 — Sun, 05 Feb 2012 13:36:37 +0000

Yo you people keep it real i love yo shit real talk niggas!!!!

Comment on Solubility Rules Song (Baby) by lust4kicksz

lust4kicksz — Sun, 05 Feb 2012 12:42:52 +0000

@lotus2038 thanx ma dude

Comment on Organic chemistry: E2 reactions (13) by Cherivier

Cherivier — Sat, 04 Feb 2012 13:06:13 +0000

loving it!

Comment on Organic chemistry: E2 reactions (13) by Alaznel

Alaznel — Sat, 04 Feb 2012 12:33:33 +0000

Thankyou so much

Comment on Polymer Clay Cane – No Background – Reducing Technique by Idit Zoota and Yonat Dascalu by KDavison1228

KDavison1228 — Sat, 04 Feb 2012 11:46:00 +0000

So glad I found this, I love this piece, nice work! I too have struggled with pen over the Caran’s. You suggest diluting the pen with water first? Should that pen be water based or alcohol? Could be a silly question, but I have to ask! Again, thanks for sharing your skills, love it!

Comment on Polymer Clay Cane – No Background – Reducing Technique by Idit Zoota and Yonat Dascalu by RachO113

RachO113 — Sat, 04 Feb 2012 11:00:09 +0000

@KDavison1228 I think you have misunderstood – You can only write over Neo colours if they have been dissolved with water – it is the neos, not the pen that you use water with. Hope that helps.