Humus Flashcards
0
Q
Has either a phenolic -OH group or a
A
Carboxylic acid -COOH group.
1
Q
Humus has a pH dependant charge, arising from
A
Chemical interactions with the surface reacting with the soil solution.
2
Q
At pH 4.5, the -COOH group
A
Loses a proton on the -OH group.
3
Q
At pH 8-10 the -OH group
A
Dissociates.
4
Q
The slight difference in charge allows the -OH group to
A
Lose or gain a proton H+, depending on the soil solution.
5
Q
If the soil solution has a low concentration of H+, then
A
It will be attracted from the -OH to the soil.
6
Q
H+ will react with OH^- in the soil solution to form
A
H2O, this will leave a negative charge on the humus.
