You Are Using Pure Limestone (CaCO₃)to Provide the Calcium Needed

question 17

Multiple Choice

You are using pure limestone (CaCO₃) to provide the calcium needed to exchange with acid cations in a soil with a maximum potential cation exchange capacity of 20 cmol_c/kg.How many kg of this limestone would you need to add to a hectare furrow slice (2.0 x 10⁶ kg) to reduce the percentage acid saturation from 40 to 10%,assuming that all the calcium added exchanged with aluminum or hydrogen ions?

• A)20,000
• B)50,000
• C)12,000
• D)6,000
• E)8,000

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