Lecture 7-8 Flashcards
1
Q
how much of earths water is fresh water?
A
3%
2
Q
what is the layer between the epilimnion and hypolimnion?
A
thermocline
3
Q
Solubility goes —— as the pressure goes up
A
up, according to henry’s law
4
Q
gas solubility goes —– as temperature goes up
A
down
5
Q
example of a precipitation reaction
A
Ca 2+ + CO3 2- CaCO3 (s)
6
Q
what is henrys law:
A
the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in contact with the liquid
7
Q
K=
A
products/reactants
8
Q
gases are more or less soluble at higher temperatures?
A
less
9
Q
why is the concentration of O2 in water important?
A
fish need 5-6 mg/L of O2 to survive!
10
Q
what are three ways O2 concentration is determined?
A
- titration by winklers method
- spectophotometry of oxidized dyes
- electrochemically by makareth O2 electrode
