PH. Each change in pH really means… Water pH Lab.

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Presentation transcript:

pH

Each change in pH really means…

Water pH Lab

Look at your graph… What does it show you?

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

pH Buffer System

If acid is added (sewage output/volcanic activity) If alkaline solution is added

Photosynthesis?? Respiration??

Ocean Acidification

Ocean Acidification Lab & Case Study ges/oa/simulation# ges/oa/simulation# Bring a water sample tomorrow!

Videos!

Dissolved Oxygen (DO)

Seasonal DO variation –what could cause this variation?

Profile Graph

After The Storm Video 20 min

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

CASE STUDY—THE DEAD ZONE Marine Issues--Homework

NOAA Dead Zone Video 4 min Eutrophication— Hypoxia— Dead Zone— Online Map Activity

What waterways connect to the Gulf? What smaller waterways connect to those? What natural processes could be contributing to water quality degradation and the development of the Gulf dead zone?

Make a Hypothesis What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?

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What anthropogenic activities or materials could be contributing to water quality degradation and the development of the Gulf dead zone?

Turbidity

Measuring turbidity Taking a Secchi Disk ReadingUsing a Turbidity Sensor

Turbidity

1. average salinity of seawater_____ 2. average pH of seawater________ 3. range of pH in seawater___ to ___ 4. instrument to test seawater salinity______ 5. type of bond between water molecules____ 6. type of molecule water is:___________ 7. area in the ocean with drastic change in salinity___________ 8. area in the ocean with drastic change in density____________ 9. What type of graphs do we use to show changes as you go down in the ocean?_______ 10. What units do we use for salinity?_____

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

CELEBRATION OF KNOWLEDGE TOMORROW!!!

Thanks to the following websites for photos and information: ean.cfm html