Draw lewis structure and identify the reacant acting as an acid and base and ind

Question

Draw lewis structure and identify the reacant acting as an acid and base and indicate if it is a bronsted lowry, lewis acid, or both

CH3^+ H2O <-> CH3OH2^+

Explanation / Answer

....................................Br .....................................| Br-Ga-Br + [Br]- ===> Br-Ga-Br .....|................................… ....Br.............................Br Hmm...well that's not quite how it's supposed to look but that's the best I can do on yahoo answers. The structure of GaBr3 looks trigonal planar which means each of the Br's should be pointing to the vertex of an equilateral triangle. Basically just draw a triangle and put one of the Br's at each corner and Ga in the center. Br- must be enclosed in brackets as [Br]- simply because it's an ion and we enclose ions in brackets and put the charge on the outside as a superscript. Same thing goes for the product GaBr4^-(GaBr4 with a -1 charge). It should be enclosed in brackets as well because it's an ion. GaBr4^- is tetrahedral so on paper it should look just about the same as the way I've written it there except make all the bonds equal length. There should be 6 dots(nonbonding electrons) around each Br in GaBr3 and GaBr4^-. There should be 8 dots around Br-. The reaction can also be written simply as: GaBr3 + Br- ===>GaBr4^- A lewis base donates a pair of electrons and a lewis acid accepts a pair of electrons. In the first reaction GaBr3 acts as the lewis acid because it accepts a pair of electrons from Br-. Br- acts as the base by donating the electrons. BF3 + F- ===>BF4^- Same thing as before except replace Ga with B and Br with F. BF3 acts as the lewis acid by accepting a pair of electrons from F- and F- acts as the base by donating the pair of electrons. EDIT: This might help you to visualize it better. Here's the structure of BCl3 which is the same as the lewis structure for BF3 and GaBr3.

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