[jaynelim]

hello. I was asked to do an assignment from my lecturer but couldn't find the right answers on the internet. Heregoes the question:
Formulate rules for determining if an organic compound will be strongly/weakly basic.

anyone?
please state the website/book used to find the answer, if possible.
Thank You!

[gfunk]

What I would do is look at a table of pKa values of various organic protons, e.g. carboxylic protons, alkynic protons, alpha-carbonyl protons, amine protons, conjugated proton sources, etc.  Think of the properties of the anion and how well the resulting conjugate base can stabilize that anion (e.g. if anion is on a naturally electronegative species, if it is conjugated with pi-systems, etc.).

Flip those around to get basicity e.g. a stronger acid will be a weaker base, a hardly-acidic species will be very basic, etc.

[gfunk]

If you're having a hard time trying to find a pKa table, you can use this one here:

http://home.cc.umanitoba.ca/~umstella/pKa_tables.pdf

It might be a bit hard to use, though.

[macman104]

I think these ones are easier, if you just want general ideas and trends:

http://classes.uleth.ca/200901/chem2600a/sorrtd.pka.jpg
http://chemweb.unp.ac.za/chemistry/Physical_Data/pKa_values.htm