Questions and Answers
What is the main difference between allophane and humus?
Allophane has a variable charge depending on soil acidity, while humus has a high cation exchange capacity
What contributes to the charge of allophane and other amorphous minerals?
Hydroxyl ions (OH-)
Where are allophane and similar clays commonly found?
In soils forming from volcanic ash
What is the primary composition of humus colloids?
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Which substance is nearly insoluble in water but mostly soluble in dilute alkali solutions?
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