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3) 10 g of soil were shaken with 100 mL 1 M NH4Cl, allowed to stand for 2 h, and filtered. 10 mL of the filtrate was taken and found to have concentrations of 220 ppm Ca2+, 180 ppm Mg2+, and 270 ppm K. What is the CEC of the soil?

3) 10 g of soil were shaken with 100 mL 1 M NH4Cl, allowed to stand for 2 h, and filtered. 10 mL of the filtrate was taken and found to have concentrations of 220 ppm Ca2+, 180 ppm Mg2+, and 270 ppm K. What is the CEC of the 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
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**Question:** 10 g of soil were shaken with 100 mL 1 M NH₄Cl, allowed to stand for 2 hours, and filtered. 10 mL of the filtrate was taken and found to have concentrations of 220 ppm Ca²⁺, 180 ppm Mg²⁺, and 270 ppm K⁺. What is the CEC of the soil? **Explanation:** This question involves determining the cation exchange capacity (CEC) of soil. CEC measures the soil’s ability to hold and exchange cations, indicating soil fertility. The experimental process involves using 10 g of soil mixed with 100 mL of 1 M ammonium chloride (NH₄Cl), shaking the mixture, letting it stand, then filtering it. A 10 mL sample of the filtrate is analyzed to measure specific ions: calcium (Ca²⁺), magnesium (Mg²⁺), and potassium (K⁺). Their concentrations are given in parts per million (ppm), and these values help calculate the total exchangeable cations, used to find the soil's CEC.
Transcribed Image Text:**Question:** 10 g of soil were shaken with 100 mL 1 M NH₄Cl, allowed to stand for 2 hours, and filtered. 10 mL of the filtrate was taken and found to have concentrations of 220 ppm Ca²⁺, 180 ppm Mg²⁺, and 270 ppm K⁺. What is the CEC of the soil? **Explanation:** This question involves determining the cation exchange capacity (CEC) of soil. CEC measures the soil’s ability to hold and exchange cations, indicating soil fertility. The experimental process involves using 10 g of soil mixed with 100 mL of 1 M ammonium chloride (NH₄Cl), shaking the mixture, letting it stand, then filtering it. A 10 mL sample of the filtrate is analyzed to measure specific ions: calcium (Ca²⁺), magnesium (Mg²⁺), and potassium (K⁺). Their concentrations are given in parts per million (ppm), and these values help calculate the total exchangeable cations, used to find the soil's CEC.
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