The following weights of cations were removed from a 1000g (oven-dry weight) soi
ID: 1058819 • Letter: T
Question
The following weights of cations were removed from a 1000g (oven-dry weight) soil sample: Na+ (0.45 g) K+ (1.17 g), Ca2+ (3.80 g), Mg2+ (0.70 g), and H+ (0.01 g). What is the cation exchange capacity of the soil? You need not complete the table as long as you show your calculations and the final answer. Note that this is an example of CEC by the sum of cations method. show all calculations
Ion
Atomic mass (g)
Charge
Mass of 1 cmolc (g/cmolc)
Mass on exchange (g/kg)
cmolc/kg
Na+
23
1
K+
39
1
Ca2+
40
2
Mg2+
24
2
H+
1
1
Ion
Atomic mass (g)
Charge
Mass of 1 cmolc (g/cmolc)
Mass on exchange (g/kg)
cmolc/kg
Na+
23
1
K+
39
1
Ca2+
40
2
Mg2+
24
2
H+
1
1
Explanation / Answer
Ion
Atomic mass (g)
charge
Mass of 1 cmolc (g/cmolc)
Mass on exchange (g/kg)
cmolc/kg
Na+
23
1
0.23
1.51
6.6
K+
39
1
0.39
1.56
4.0
Ca2+
40
2
0.20
4.40
22.0
Mg2+
24
2
0.12
0.72
6.0
H+
1
2
0.01
0.05
5.0
Total CEC
43.6
Ion
Atomic mass (g)
charge
Mass of 1 cmolc (g/cmolc)
Mass on exchange (g/kg)
cmolc/kg
Na+
23
1
0.23
1.51
6.6
K+
39
1
0.39
1.56
4.0
Ca2+
40
2
0.20
4.40
22.0
Mg2+
24
2
0.12
0.72
6.0
H+
1
2
0.01
0.05
5.0
Total CEC
43.6
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