50 g of soil is extracted with NH4Cl (ammonium chloride) and the extract diluted to 0.5 liter. The solution contained the following cations:
120 ppm Ca+2 24 ppm Mg+2 1 ppm Na+ 13 ppm K+
a. Estimate the CEC (meq/100g)
b. The soil pH is 7.5. Was your estimate of CEC a good estimate? Why or why not?