No other data provided
3. The cations on an exchangeable site of a 40 g soil weredisplaced by repeatedly washing by a salt and found to be 40 mgCa+2, 11.5 mg Na+1, 39 mg K+1, 12 mg Mg+2, and 9 mg Al+3. The pH ofthe soil was 5.0. Calculate the CEC (cmolc/kg), percentage basesaturation (PBS) and percent acidic saturation (PAC) per kg of thesoil.
4. A give soil has a CEC of 12.50 cmol of charge per kg of soil.If 70%, 15%, 10% and 5% of the CECis occupied by Ca+2, K+1, Mg andNa+1 , respectively, calculate the weight (grams) of Ca, K, Mg andNa in the soil.
5. A given soil contains the following colloids: 1.0% humus(CEC=200), 30% kaolinite (CEC=5), 5%smectite (montmorillonite)(CEC=80), 10% illite (CEC=20), 5% mica (CEC=70) and 49%sesquioxides (CEC=2). Calculate the CEC of the soil? Which colloidscontributed the most and which contributed the least? (All CEC arein molc/kg soil).
6. Calculate the amount of pure CaCO3that could theoreticallyneutralize the H+ in one-year acid rain if a 1-hectare (ha) sitereceived 200 mm of rain per year and the average pH of the rain was5.0.
7. Calculate the pH and pOH of a soil with the following H+concentrations: (a) 0.0000001M (b) 0.00001M (c) 0.005M? Which soilis relatively most acidic? Most basic?
8. Determine the calcium carbonate equivalent (CCE) of thefollowing compounds: (amount that has the same neutralizing valueas 100 g pure CaCO3) (a) KOH (b) Mg(OH)2 (c) and CaMg(CO3)2.
9. How many grams of limestone with a CaCO3 equivalent of 100%would you need to apply to an acidic soil with 85% exchangeable Alsaturation to reduce it to 10%? The CEC of the soil is12.5cmolc/kg.
10. How many grams of gypsum (CaSO4.2H2O) would you need toreclaim a sodic soil with an exchangeable sodium percentage (ESP)of 80% to reduce to it to 50%? The CEC of the soil is12.5cmolc/kg.
