SWS3022 Exam 3 Questions and
Answers | 100% Pass
What is mineral formation? - Answer️️ -When aluminosilicates dervive charge from
substitution of lower-charged cations for higher charged cations in the crystal matrix
What charge results from mineral formation? - Answer️️ -permanent nega...
How do you measure active acidity? - Answer✔️✔️-- 1:1 or 2:1 extract (10g soil and 10
mL water or 10g soil and 20 mL water)
What is the pH formula concerning log? - Answer✔️✔️-pH = -log(H+)
-pH = log(H+)
10^-pH = 10^log(H+)
10^-pH = (H+)mol/L
What is exchangeable acidity? - Answer✔️✔️-- H+, Al3+Al(OH)2+, and Al(OH)2+ are all
cations
- acidity associated with cation exchange sites on mineral or organic colloids
- aka salt-replaceable acidity
- 100-1,000x more than in active acidity
- allows it to contribute to the pH of soil
- cations held near minerals and materials
What is residual acidity? - Answer✔️✔️-tightly bound to clay minerals and humic organic
materials
What is the formula for total acidity? - Answer✔️✔️-total acidity = active + exchangeable
+ residual
T/F Acids increase the H+ concentrations in solution - Answer✔️✔️-true
Acidity associated with the soil solution is called: - Answer✔️✔️-active acidity
Identify one source of H+ ions to soil - Answer✔️✔️-atmosphere (respiration from
microorganisms)
T/F Rainfall is naturally acidic - Answer✔️✔️-true
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