1. Opener, FRIDAY!!! Jan. 23 rd What are 2 things that affect the density of ocean water, and HOW do they affect it? Please make sure that you’ve answered the ice cream lab summary questions!

2. Openers Put date and # of opener Copy/paraphrase opener If you are absent, get it the next day May be covered on next quiz!

3. Questions before the quiz? After your quiz: Start your homework— –Dead Zone article assignment –Heat Capacity Graphing

5. pH = Pure Water Seawater

6. pH pH scale= pH scale More acidic neutral more basic 0--------------------------7----------------------14 Magic numbers: Seawater pH Range: Seawater pH average:

7. pH Each change in pH # means a pH 4 = pH 3 = AND so on!! This is why it is the

8. Seawater has a Buffer! What is a buffer??? Ocean Acidification –CO2 + H2O  H2CO3 (carbonic acid) –H2CO3  HCO3 + H+ (loses an H+) –HCO3 + H+  CO3 + 2H Ocean also becomes more …………….from sewage and volcanoes How is seawater different from fresh water?

9. Ocean Acidification: The Acid Test https://www.youtube.com/watch?v=5cqCv cX7buohttps://www.youtube.com/watch?v=5cqCv cX7buo 20 minutes

10. Dead zone What is the dead zone and where? List 4 “things” that contributed to the dead zone: What is hypoxia and why is it bad?

11. Opener, Jan. 27 th 1.What does it mean, “seawater has a buffer”? 2.If you had a 100 mL sample of seawater and a 100 mL sample of freshwater, which would show a bigger pH change if 2 mL of HCl (acid) was added?

12. Dissolved Oxygen (DO)

13. Magic Numbers: 6ppm is average Below 4 ppm organisms start to die 2 ppm is hypoxic (most things die) 0 ppm is anoxic

14. How does oxygen get into the water??

15. Factors that affect DO

16. DO variation affects “quality” of water Colder water dissolves more oxygen

17. Seasonal DO variation –what could cause this variation? DO varies with time of day, temperature and weather

18. Video: After the Storm https://www.youtube.com/watch?v =0fIXhs6DzIE

19. Tools to Measure salinity, DO, pH Salinity: Hydrometer Refractometer Conductivity meter DO: Dissolved oxygen tubes pH: pH Meter

20. Turbidity

21. Measuring turbidity Secchi disk measures water clarity Turbidimeter measures turbidity in ntu’s Ntu- nephelometric turbidity units OR ppm

22. D.O. Graphs Comparing seasonal variation