Question

Tools Window Help 80%-) Fri Mar 23 5: Problem.Set.ll.Chap.8.9.10.2018.pdf (1 page) -Edited v 순 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 (cmolokg) of the soil. 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 Ca 2, 1.5 mg Na*1, 39 mg K:1, 6 mg Mg 2, and 9 mg Al*3. The pH of the soil was 5.0. Calculate the CEC (cmole/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+1, Mg and Na 1, respectively, calculate the weight (grams) of Ca, K, Mg and Na in the soil. 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 molokg soil). 5, 6. Calculate the amount of pure CaCOs that could theoretically neutralize the H in one year acidrain if a 1 hectare site received 1400 mm of rain per year and the average pH of the rain was 5.5
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Answer 1