Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Molecular Structures: Acids
Vview molecular structures and formulae of four common acids - acetic, nitric, phosphoric, and carbonic. Manipulate each structure to view it in a three-dimensional format.
Other
Phosphoric Acid
This Canadian Centre of Occupational Health & Safety site offers links about the specific health effects, safety, proper handling, and first aid of phosphoric acid exposure.
Shodor Education Foundation
Shodor: Acid Base Chemistry
This Shodor Education Foundation page has a nice look at the major theories of acids and bases in less than one page. There are very simple defintions.