If soil has 20 meq of CEC/100 g, how many milligrams of Ca2+ will this equal?
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If soil has 20 meq of CEC/100 g, how many milligrams of Ca2+ will this equal?
6. A quantity of 100 g of soil has a CEC of 5 meq. How may negatively charged sites does this soil have? 7. A soil was determined to have 12.5 meq/100 g of CEC. How many cmole/kg would this equal? 8. Convert the following concentrations into parts per million (ppm): At wts: Ca2+ = 40, H = 1, Mg2+ = 24, K = 39 9. Convert 3 cmol/kg soil Cainto parts per million (ppm).
Soil testing laboratories usually estimate cation-exchange capacity (CEC) as the sum of Ca2", Mg, and K displaced during extractions with neutral, 1 N ammonium acetate (NH 0Ac), which are performed primarily to test for available K. The following data were thereby obtained for three contrasting soils, but have been reported as pounds per acre for each of the three elements, assuming the conventional weight of 2 million pounds for an acre of soil 6 inches deep. Soil A 4004 381...
Based on the sample calculation, the CEC of the soil was 50.8 meq/100g and the equivalent weight of Ca2+ (one of the base cations) extracted by ammonium acetate solution was 3.13 meq/100g. The ammonium acetate solution also contains 150 mg K+/L, 75 mg Na+/L, and 83 mg Mg2+/L. calculate the equivalent weight of K+, Na+, and Mg2+ in a 5 g soil: 35 mL extractant. Given all these values, compute the base saturation of the soil.
Calculate Liming Requirements. You have a soil sample with a CEC of 10 meq / 100 g soil, a pH of 4.8 and a BS of 37%. You would like to raise this soil to a pH of 6.5, so you need to raise the BS to 65%. You also have a Mg deficiency. Assume 93% purity of your liming agent. During screening of a 100g sample, you had 1.5 g on the 8-mesh screen, and 13.4 g on the...
What is the ESP (exchangeable sodium percentage) for a soil sample having 25 meq/100g CEC and exchangeable Ca, Mg, K and Na contents of 15, 3.5, 1.5 and 5.0 meq/100g respectively? Is this sample likely to be considered a "sodic soil"? It has a pH of 9.2.
The typical concentration of Mg2+ in blood is 3 mEq/L. How many milligrams of Mg2+ are in 380 mL of blood?
6.) (8) The Ksp for Calcium Fluoride is 1.46 x 10-10. How many milligrams of Ca2+(aq) can be present in 3.75 L of 0.25M NaF solution? (Molar mass of Ca = 40.08 g/mol) Final answer:
What is the cation exchange capacity (in meq/100 g) and base saturation (in %) of a 200 g soil sample that contains the following amounts of exchangeable cations: 360mg Ca 2+, 46mg Na+, 312mg K+, 216mg Mg2+, 100mg Al3+, and 20mg H+. Use the following molar weights: Ca2+= 40.1 g/mol; Na+= 23.0 g/mol; K+= 39.1 g/mol; Mg2+= 24.3 g/mol; Al3+= 27 g/mol and H+ is 1 g/mol.
A loamy soil contains 5% organic matter and 10% kaolinite clay. What is a reasonable estimate of its CEC per 100 g?
a) Suppose that 1 g of dry soil is mixed vigorously with 100 mL of 0.5 M ammonium acetate solution. The soil and water mixture is filtered to remove the soil. The concentrations of calcium, magnesium, potassium, and hydrogen ions in the filtrate are measured. The concentrations of the cations found in the extraction solution are as follows: Ca2+-25.8 μg/mL, Mg2 3.4 ug/mL, K -2.2 ug/mL. Calculate the CEC of the soil. This is the same problem from Discussion 2....