Question: Assuming that layer silicates and humic acid exist independently in the soil, calculate a typical CEC that would be measured for a soil at pH

Assuming that layer silicates and humic acid exist independently in the soil, calculate a typical CEC that would be measured for a soil at pH 7 containing: a. 300 g kg' montmorillonite and 30 g kg SOM b. 300 g kg' kaolinite and 30 g kg- SOM. Pick a reasonable value and site your source (text, notes, etc.) c. In a real soil with similar amounts of minerals and SOM, would you expect higher or lower CEC? Why?

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