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The magnitude and sign of the surface potential, which determines the extent of adsorption and in turn flotation, are dependent upon the concentration of Na+, and pH of solution and will be determined on the basis of the reaction:
3Si + Na+ + Al(OH)3 + 5H2O == NaAlSi3O8 + 13H+ + 12e-  (4)
Accordingly, utilizing the Gibbbs¡¯ free energy values in kJ/mol (Standard Potentials in Aqueous Solutions,1985) (NaAlSi3O8 = -3711.1, Na+ = -261.87, Al(OH)3 = -1154.9, H2O = -237.18) the potential values resulted in the following equations for albite (EA):
EA = - 0.978 - 13/12*0.059 pH - 1/12*0.059 log [Na+]          (5)

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