5. calculate the cation exchange capacity of the soil using the ca, mg, capacity of the soil using the ca, mg, na, and k soil-test information and the soil contains 0.4 cmol/kg soil of acidity or h. (10 pt) a. additional information: ca2+ = 40.1 g/mol; mg2+ = 24.3 g/mol; k+ = 39 23.0 g/mol b. assume that lb/acre divided by 2 equals ppm. cmol/kg soil