What is mineral formation?
-:- When aluminosilicates dervive charge from substitution of lower-charged
cations for higher charged cations in the crystal matrix
What charge results from mineral formation?
-:- permanent negative charge
What substitution happens during mineral formation?
-:-...
✓ -:- - Al splits water and reacts with resulting OH-
H2O -> OH- + H+
Al3+ + H2O = Al(OH)2+ + H+
Al(OH)2+ + H2O = Al(OH)2+ + H+
What is active acidity?
✓ -:- - acidity associated with soil solution
- this is what is measured when you take the pH of the soil (measure with a pH meter)
- cations held in solution
How do you measure active acidity?
4|Page | Grade A+| 2024/2025
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