1. Seawater Chemistry

2. Without water, there would be no:

3. Water RULES!

4. So, how does this SIMPLE molecule, composed merely of two hydrogen atoms and one oxygen atom (H 2 O), do ALL of the amazing things that it does?

5. Here are ten properties of water that are familiar to us all:

6. Properties of (Sea)Water

7. Universal Solvent

8. Polarity

9. The Dissolving Power of Water

11. Cohesion & Adhesion

12. Surface Tension

13. Salinity Salt flat in Bolivia Utah's Salt Flat Video

15. Major ions in seawater IonConcentration (ppt) Percentage % 19.355 10.730.6 2.77.7 1.34 0.41.18 0.41.11

16. Principle of constant proportions

17. For example: In any sample of seawater, whether it has a salinity of 20 ppt or 40 ppt: chlorine accounts for 55% of the ions, sodium comprises 30.6%, sulfate makes up 7.7%....

18. Factors affecting salinity Evaporation or freezing Frequent precipitation or melting ice

19. Tools for Measuring salinity

20. Sources of salts

22. Density

23. Salt wedge

24. Osmoregulation

26. Minnow lab

27. Osmoregulation In Fresh Water In Sea Water

28. Osmoregulators vs. Osmoconformers

29. Heat Vs. Temperature 100 º Celsius (200 º F) 100 º Celsius Which container has molecules with the higher average kinetic energy? Which container has the most heat energy?

30. Water has a high heat capacity!

31. Water can absorb a tremendous amount of heat!

33. Heat capacity graph for water

35. You experience this here!!!

37. Temperature - Very important!

40. Icefish Lab Freezing Point Depression Lab Quiz tomorrow!!!

41. pH

43. Each change in pH really means…

44. Water pH Lab

45. Look at your graph… What does it show you?

46. Seawater has a BUFFER! What is it? What causes it? How is seawater different from fresh water?

47. pH Buffer System

48. Ocean Acidification

49. Ocean Acidification Lab & Case Study Bring a water sample tomorrow!

50. Dissolved Oxygen (DO)

52. Seasonal DO variation –what could cause this variation?

53. COMPARING WATER SAMPLES LAB How can we measure…. Salinity DO pH

54. CASE STUDY—THE DEAD ZONE Marine Issues--Homework

55. Turbidity

56. Measuring turbidity

58. A Terrible Spill Activity & Marine Issues

59. Magic numbers!!!!!!!! Salinity –avg 35 ppt DO –avg 5 – 6 ppm (2ppm hypoxic; 0ppm anoxic) pH –avg 8 (7.5 – 8.4)

60. CELEBRATION OF KNOWLEDGE TOMORROW!!!

61. Thanks to the following websites for photos and information: http://mddnr.chesapeakebay.net/eyesonthebay/whatsitm ean.cfm http://www.bigelow.org/virtual/heat_cap.jpg http://schc.sc.edu/mare/estuaries.htm http://waterontheweb.org/under/waterquality/turbidity. html http://www.indiana.edu/%7Eg131/chem6.gif