A pesticide is added to soil slurry in a beaker containing 10.0 g of soil and 100 ml of 0.0050 M CaCl2 with 1 mg L-1 of a pesticide. After reaction the concentration of pesticide in the solution is 0.10 mg L-1. Assume linear adsorption, calculate Kd. Predict the soil solution concentration if a soil contains 4.0 mg kg-1of pesticide.