5. Examine the stability diagram for smectite, kaolinite, and gibbsite at the en

Question

5. Examine the stability diagram for smectite, kaolinite, and gibbsite at the end of this problem set for pH 5 and pH 6.5. Note, the figure shows stability diagrams at two different pH for the three minerals on one figure to allow comparisons between pH. However, when considering only one pH, the lines for pH 5 and pH 6.5 should be interpreted as separate figures (20 pts). a) State the differences in the lines at pH 5 and 6.5 and explain the reasons for these differences (5 pts) b) Using what you know about the saturation index and solubility explain what minerals will be precipitating and dissolving, which mineral is most soluble, and which is most stable at (15 pts) i) log (Si(OH)2, log[(solid)/(A)] 8 (pH 5 and 6.5) (pH 5) (pH 6.5) -label point on diagram "A" ii) log (Si(OH)4)--3.15, log[(solid)/(AP)] = 6.5 -label point on diagram "B" iii) log (Si(OH)4)--3.85, log(solid)/(AP)] = 10.5 -label point on diagram "C" 15 14 13 12 11-Gibbsite pH 6.5 Smectite pH..°. Kaolinite pH 6.5 10 Gibbsite pH 5 Kaolinite pH 5 4 3 2 Smectite pH5 (Fe3) - 1013 (Mg") = 104 -5.0 -4.5 4.0 -3.5 3.0 -2.5 2.0 log (SI(OH))

Explanation / Answer

part a

basically these all are clay minerals.Soluble silica and metal cations are dissolved materials and these are very small particles and there stability curves represent weathering showing that more will be the stability less will be the weathering.the intersecting positions shows the equilibrium positions at specific ph values indicating thier stabilities.

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