1. Defining Acid and Base (notes) Because a base has OH - and an acid has H +, Arrhenius (Swedish) defined:

2. Acid: Substance that donates H + Base: Substance that donates OH -

3. HClH2OH2O Cl - +H3O+H3O+ + H H O H+H+ + H H O H+H+ + acidbase conjugate acid conjugate base But let’s consider the dissociation of HCl in water: Dissociate HCl: From this, Br ø nsted and Lowry define:

4. Acid: Substance that donates H + Base: Substance that accepts H +

5. Chemistry and Baseball?

6. I play home Base and he plays second Base. We are receivers

7. I play first Base

8. HClH2OH2OCl - +H3O+H3O+ + H+H+ H+H+ O -- H+H+ +Cl - H H O H+H+ + acidbase conjugate acid conjugate base Cl - H H O H+H+ +