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.

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Presentation transcript:

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!

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

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

pH = Pure Water Seawater

pH pH scale= pH scale More acidic neutral more basic Magic numbers: Seawater pH Range: Seawater pH average:

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

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?

Ocean Acidification: The Acid Test cX7buohttps:// cX7buo 20 minutes

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?

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?

Dissolved Oxygen (DO)

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

How does oxygen get into the water??

Factors that affect DO

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

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

Video: After the Storm =0fIXhs6DzIE

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

Turbidity

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

D.O. Graphs Comparing seasonal variation