1. TOPIC: WATER, the neutral substance Do Now

2. Water self-ionizes H 2 O(l) + H 2 O(l)  H 3 O +1 (aq) + OH -1 (aq) H 3 O +1 H 3 O +1 = hydronium ion OH -1 = OH -1 = hydroxide ion H +1 and H 3 O +1 used interchangeably H +1 H +1 called proton or hydrogen ion

3. Acid, Base, or Neutral H 2 O contains some H +1 & some OH -1 ions all H 2 O contains some H +1 & some OH -1 ions – pure H 2 O: concentrations very low (like 10 -7 ) Neutral solution: [H +1 ] = [OH -1 ] Neutral solution: [H +1 ] = [OH -1 ] Acidic solution: H +1 > OH -1 Acidic solution: H +1 > OH -1 Basic solution: OH -1 > H + Basic solution: OH -1 > H +

4. Answer questions on p. 4

5. Now let’s review salts Ionic Compounds (metal + nonmetal) Structure = Crystal lattice = solid Can ionize in water – NaCl(s)  Na +1 (aq) + Cl -1 (aq) – CaBr 2 (s)  Ca +2 (aq) + 2Br -1 (aq) – Al(NO 3 ) 3 (s)  Al +3 (aq) + 3NO 3 -1 (aq) Can be formed when acids and bases react Can be formed when an acid and metal react H2OH2O H2OH2O H2OH2O