Dear all,
I do research on a kind of clay and use NaOH as an alkali-activator for stabilization. The pH 2,4,6 mol. of NaOH solution are 12.9,13, and 13.1, respectively. The pH of natural soil is 8 and whenever NaOH with mentioned molarity is added to the soil, the pH of 2,4, and 6 mol. reach to 13.1, 12.9, and 12.7, respectively. In other words, the relation of the pH of soil and molarity is inverse. The more molarity, the less pH. It must be noted that the clay contains about 40% of calcium carbonate (CaCO3) and about 40% of SiO2 in the form of Quartz. The question is, why adding a solution with higher molarity produces a slurry with lower pH??
Regards
MJM
Consider the rate of formation of Ca(HCO3)2. Also test how close to equilibrium the systems may be.
Dear sir this paper might be helpful
Article A Critical Appraisal of the Role of Clay Mineralogy in Lime ...
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