Tools Window Help Problem.Set.ll.Chap.8.9.10.2018.pdf (1 page)-Edited 80% Fri Mar 23 5: Q Search 2. All exchangeable cations on a 30-g soil were displaced by NH4*. Then NH4* was displaced by K* and NH4* was determined to be 60 mg in solution. Calculate the CEC (emol/kg) of the soil. 3. The cations on an exchangeable sites of a 30 g soil were displaced by repeatedly washing by a salt and found to be 30 mg Ca2, 1.5 mg Na, 39 mg K, 6 mg Mg2, and 9 mg Al". The pH of the soil was 5.0. Calculate the CEC (emol/kg), percentage base saturation (PBS) and percent acidic saturation (PAC) per kg of the soil. 4. A give soil has a CEC of 40 cmoles of charge per kg of soil. If 40%, 30 %, 20% and 10% of the CEC is occupied by Ca2, K, Mg and Na", respectively, calculate the weight (grams) of Ca, K, Mg and Na in the soil. 5. A given soil contains the following colloids: 1.5% humus (CEC-200), 35% kaolinite (CEC-5), 5% smectite (montmorillonite) (CEC-80), 5.5% illite (CEC-20), 15% mica (CEC-70) and 38% sesquioxides (CEC-2). Calculate the CEC of the soil? Which colloids contributed the most and which contributed the least? (All CEC are in mol./kg soil). 6. Calculate the amount of pure CaCO3 that could theoretically neutralize the H in one year acidrain if a 1 hectare site received 1499 mm of rain per year and the average pH of the rain was 5.5.