1. Acids and Bases pH Scale Marine Biology

2. Warm Up What is the pH scale? What is the difference between an acid and a base? What is neutral? How are enzymes effected by pH?

3. Acids and Bases The pH scale ranges from 0 – 14 Acid – donates H+ when added to aqueous solutions Ranges from pH 0-6.9 Base – breaks up into hydroxide (OH-) ions and another compound when placed in an aqueous solution Ranges from pH 7 – 14 Neutral- pH of 7 Distilled water is pH 7.0 or. Why? H 2 O H+ + OH- pH Scale Video

5. Acids and Bases Buffers – compounds used to maintain a contant pH within a system H 2 CO 3 H + + HCO 3 - Carbonic acid bicarbonate ion

6. Acids and Bases Acid Rain is caused by pollution. Chemicals are released into the air by factories, cars etc. When it rains, these chemicals drop to the earth and make the rain water more acidic. After watching the video, be ready to explain how acid rain effects living organisms.video

7. Enzymes and pH Enzymes are special proteins that speed reaction rates. Enzymes are designed to work in a certain pH and temperature. Enzyme Video

8. Review Pages 369-371 Add to your notes to answer the following questions: Is ocean water acidic or basic? Why? How is acid rain formed? Why is it that ocean water is less effected by acid rain?