Homework Help: chemistry

Posted by Jacob on Sunday, November 8, 2009 at 12:03pm.

Which one of the following is NOT a Lewis acid-base reaction?
1. ) Ca + S --> Ca2+ + S2-
2. ) BeF2 + 2 F- --> BeF42-
3. ) H+ + -O-H --> H-O-H
4. ) NH3 + BF3 --> H3N-BF3

i thought it was 1...but im not sure...but i know that 3 & 4 are definatly right.

chemistry - GK, Sunday, November 8, 2009 at 2:57pm
In #2, the two F- ions are "donating" electron pairs to the Be atom in forming covalent bonds with Be. That makes F- a Lewis base and the Be atom a Lewis acid. In #1 there is a transfer of electrons from Ca to S in forming two ions. No covalent bonds are formed. Is that consistent with your answer?

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