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Assume the molecular weight of NH4* is 18 g/mol, then the soil sample has: 1100 mg NH4+ per kg soil, i.e. 6.11 cmol NH4+ per kg soil, thus the CEC is 6.11 cmolc NH4* per kg soil.

Assume the molecular weight of NH4* is 18 g/mol, then the soil sample has: 1100 mg NH4+ per kg soil, i.e. 6.11 cmol NH4+ per kg soil, thus the CEC is 6.11 cmolc NH4* per kg soil.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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We washed 150 g of soil with 300 mL NH4Cl and then flushed it with KCl. The concentration of NH4+ in our final solution is 550 mg NH4+ L-1. Using these data, answer the following questions:

3.  this soil likely contains high amounts of vermiculite. TRUE or FALSE

4. Is this soil more likely to belong to the soil order Mollisol or Spodosol?

Assume the molecular weight of NH4* is 18 g/mol, then the soil sample has: 1100 mg NH4+ per kg soil, i.e. 6.11 cmol NH4+ per kg soil, thus the CEC is 6.11 cmolc NH4+ per kg soil. True O False
Transcribed Image Text:Assume the molecular weight of NH4* is 18 g/mol, then the soil sample has: 1100 mg NH4+ per kg soil, i.e. 6.11 cmol NH4+ per kg soil, thus the CEC is 6.11 cmolc NH4+ per kg soil. True O False
Which measurement of CEC will this analysis provide? Effective, as it measures the CEC at existing soil pH Sum of cations, as we only washed the soil with NH4CI Buffered, as we washed the soil with NH4 acetate and NaCl
Transcribed Image Text:Which measurement of CEC will this analysis provide? Effective, as it measures the CEC at existing soil pH Sum of cations, as we only washed the soil with NH4CI Buffered, as we washed the soil with NH4 acetate and NaCl
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will this soil likely contain high amounts of vermiculite?

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is this soil more likely to belong to the soil order Mollisol or Spodosol?

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