What Is The Best Way To Use Acids, Bases And Salts As A Topic For A Chemistry Fair?

I need a good topic would not be too general or common. No one should think of him so easily, it is best if it is something like an audiovisual presentation, a visual presentation, a fixed model or a model of work (not experiments), a pair of thirteen year old can handle themselves . It would be nice, but its another simple issue, even in "organic chemistry" or "Medicinal Chemistry".