1. What element(s) can a Si\" be substituted by? In what type of sheet would thi
ID: 116149 • Letter: 1
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1. What element(s) can a Si" be substituted by? In what type of sheet would this happen in? What element(s) can a Mg2+ be substituted by? this happen in? In what type of sheet would What element(s) can an Al3+ be substituted by? this happen in? In what type of sheet would 4. What limits a particular cation from replacing another cation (AKA what limits IS from occurring)? 5. Give an example of how a positive net charge would occur from iS given what you know about what limits IS from occurring. 6. Vermiculite has considerable substitution of Al* in the Si positions. If one Al substitute for one Si*, what would be the net charge? 7. The high CEC of smectites primarily comes from the Mg2 substituting Alb+ in octahedra sheets, and Al substituting for Si* in tetrahedral sheets. If one Mg2+ substitutes for one Alb* in an octahedral sheet, and two Al substitute for two Si* in a tetrahedral sheet, what would be the net charge? . In the mica group, the main source of negative charges is the substitution of Ai in about 20% of the Si4+ positions. If there is a tetrahedral sheet consisting of 100 Si4 would the net charge be if 20% were substituted by APExplanation / Answer
1) a)Si can be stubstituted by Al (alluminium)
b) phylosilicate or sheet silicates
2) a)Ca2+,Fe2+
b) Nesosilicates
3) can be replaced by Fe3+, Cr
b) nesosilicates
4) a) ions with the same valence and radius should exchange easily and enter a solid solution in amounts equal to their overall proportion
b) 2 ions have a similar radius and the same valence: the smaller ion is preferentially incorporated into the solid over the liquid
c) ions have a similar radius, but different valence: the ion with the higher charge is preferentially incorporated into the solid over the liquid
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