2. INDICATORS & pH: Part 2 What is the difference between an acid and a base? Acid: H 3 O + (hydronium) ion Base: OH - (hydroxyl) ion Acids: react with metals Bases: react with animal products Universal indicator: Indicator that will provide a color change AND the strength of the acid or base. Gives the pH. IAN, page 52

3. pH: Number between 0 - 14 ACIDneutralBASE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

4. WHAT IS THE pH? Choose between 0 6 7 8 14: 1. A strong acid would have a pH of ___ 2.A weak acid would have a pH of ___ 3.A strong base would have a pH of___ 4.A weak base would have a pH of ___ 5.If a substance is neutral, it has a pH of ____

5. Procedure 1.Predict whether each liquid is acid, neutral, or base. 2.Test each liquid with universal indicator. Use only one drop of the indicator for each test. Record the color change. 3.Record whether the liquid is acid, base, or neutral and record it’s pH. 4.Use Color!

6. Predict color pH acid/base/neutral? Ammonia Distilled Water M.O.M. Lemon juice Milk Vinegar Pg. 51 of IAN

7. Conclusions 1. Rank the solutions from most acidic to most basic. Make sure you add their pH.