1. pH Water Property: Dissociation of Water Theme: Homeostasis

2. Preview/Review In your notes draw a pH scale. On it, identify: Numbers associated with acids/bases/neutral 3 examples of acids (including one human example) 3 examples of bases (including one human example)

3. pH scale How does the concentration of H+ ions relate to pH? ph=-log[H+]

4. How do H+ ions form? Dissociation of water:

5. Equilibrium…aka homeostasis What happens to the pH of water when [H+] ions = [OH-] ions How would the balance shift if hydrochloric acid was added to water?

6. Examples in living things! Interactions of water with CO2 causes changes in pH. Major cause of decline of coral reefs. Reason your brain senses you need to breathe!

7. Increased CO2 levels leading to death of Corals

8. Increased CO2 levels cause you to breathe!

9. Hypothesis: Bromothymol blue is an indicator for acids. What is an indicator? Blue: >pH 7 Yellow: <pH 6 What will happen if your teacher breathes into the bromothymol blue? State in an if…then…because