lect 12

Question 1

what are the limits of pE in water?

Answer 1

Question 2

what are the applications of pE-pH diagrams?

Answer 2

Question 3

what is the template for use with pE-pH plots?

Answer 3

Question 4

what can humic substances react as?

Answer 4

humic substances as natural reductants?
-humic substances may function as reducing agents in natural water systems
-may be due to the quinone/hydroquinone group

Question 5

what are measurements of pE? what are the limitations?

Answer 5

-indicator electrode (inert) develops potential in response to ratio of redox couples
-reference electrode
-voltmeter

limitations: non-equilibrium conditions, many species are part of several different redox couples… unstable potentials result

Question 6

Question 7

what is corrosion?

Answer 7

corrosion: destructive alteration of metal through interactions with its surroundings

Question 8

when does corrosion take place?

Answer 8

Question 9

what is the graph of the rusting of iron?

Answer 9

Question 10

what is the graph of microbial corrosion such as of iron?

Answer 10

Question 11

Question 12

Answer 12

Question 13

Answer 13

Question 14