A 1 Kg Soil Sample Has 2 Cmol_c of Al³⁺

question 37

Multiple Choice

A 1 kg soil sample has 2 cmol_c of Al³⁺ on the exchange complex. Addition of which of the following would most effectively replace about half of this Al?

• A) 1 cmol_c K⁺
• B) 10 cmol_c OH^-
• C) 4 cmol_c Ca²⁺
• D) 4 cmol_c Na⁺ E. 2 cmol_c Na⁺

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