Biology-Online • View topic - Solubility

## Solubility

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

Moderator: BioTeam

### Solubility

How do you tell if two substances are soluble with each other or not?

Charlene
Garter

Posts: 45
Joined: Mon Apr 25, 2005 1:07 am

Simply, like dissolves like:

Polar solvent, polar solute= soluble

Non polar solvent, non polar solute= soluble

Polar solvent, non-polar solute (or vice versa)= insoluble

James
King Cobra

Posts: 552
Joined: Wed Feb 23, 2005 11:00 pm
Location: England

What if you were given like two equations?
(some random examples...)
e.g. H2O and C8H18
e.g. HCl and C2H4O2
e.g. (NH4)2SO4 and H3PO4

Charlene
Garter

Posts: 45
Joined: Mon Apr 25, 2005 1:07 am

Well you would have to check for polarity, we had a thread here about that but I'm too lazy to dig it up. Use the search function.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

mith
Inland Taipan

Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN

lazy... ~_~" lol...

Charlene
Garter

Posts: 45
Joined: Mon Apr 25, 2005 1:07 am

Well, for H2O and C8H18, water is polar, alkanes are not, thus they will not be soluble in one another.

James
King Cobra

Posts: 552
Joined: Wed Feb 23, 2005 11:00 pm
Location: England

really?? oh good good... I just completed this quiz for chemistry and I put that as soluble with each other~~~ This other guy who sat next to me had a contradictory answer as me and he's smart... that's freaking me out... (he put it as not soluble) lol...

The first one was all I remember from the quiz, the rest were made up off the spot =p

Charlene
Garter

Posts: 45
Joined: Mon Apr 25, 2005 1:07 am