classify each of the following as a lewis acid or base:

Cl-
BeCl2
B(CH3)3
P(Ch3)3

Cl- is an acid right? i'm not sure i understand this concept very well. :[ and i tried looking at my notes already.

2 answers

Here is a site that may help a little but it isn't very extensive.
http://facultyfp.salisbury.edu/dfrieck/htdocs/212/rev/acidbase/lewis.htm
I get confused sometimes too when we talk about Lewis acids but you need to recognize Lewis acids readily, especially when you take organic chemistry. I don't work with them much and I prefer the Bronsted-Lowry theory. By the Lewis theory, acids are electron acceptors. I find that drawing the Lewis dot structure helps me.
If we draw the Lewis electron dot structure for Cl^-, there aren't any spaces left in which to place an electron. So Cl^- is not a Lewis acid.
BeCl2 has a couple of spaces left.
B has one space left.
Thank you for your help! That website did clarify things a bit. Thanks again!
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