# Homework Help: Lewis Acids

1. Feb 13, 2005

### vsage

It's been awhile since I've done chem and I don't really remember how to identify Lewis Acids too well so here are a few problems I'd like you guys to check over / correct:

$$CaO(s) + SO_3(g) \rightarrow CaSO_4$$ My answer: $$SO_3$$

$$Ca^{+2}(aq) + SO_4^{-2}(aq) \rightarrow CaSO_4(s)$$ My answer: $$Ca^{+2}$$

$$Al(OH_2)_6^{+3} + H_2O \rightarrow Al(OH_2)_5OH^{+2} + H_3O^{+}$$ My answer: $$Al(OH_2)_5OH^{+2}$$

$$CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(s)$$. My answer: $$CaO(s)$$ but there's also another Lewis Acid according to the worksheet

$$NaCl(s) \rightarrow (H_2O) Na^+(aq) + Cl^-(aq)$$
My answer: $$Cl^-$$ but there's another Lewis Acid according to the worksheet

I unfortunately had to miss class for another exam the day of this lecture so I'm pretty clueless! Thanks in advance.

Last edited by a moderator: Feb 13, 2005