calculation questions

Sophia, You do not require a calculator for the final exam. There are no calculation questions (like the one on the midterm). You should however understand the principal behind the example you give above - that CEC of clay (or organic matter) does not equate to the CEC of the soil. If you have a soil with high clay content (e.g. 40%) what are the implications for CEC (of the soil)? If you have a soil with 15% organic matter, what are the implications for CEC (of the soil)