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

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