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This mineral fluorite, which is composed of calcium ions and fluoride ions, has the unit cell shown here.

(a) What type of unit cell is described by the Ca2+ ions?

(b) Where are the F- ions located, in octahedral holes or tetrahedral holes?

(c) Based on this unit cell, what is the formula of fluorite?

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Patrick Suarez
Patrick SuarezLv10
19 Dec 2020

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Groundwater at a temperature of 250C flows through strata containing abundant fluorite (CaF2) mineralization and becomes saturated with respect to that mineral. The equilibrium solubility product, Ksp, for this reaction is 10^-10.4.

a) Calculate the concentrations of Ca2+ and F- once the water has reached saturation with respect to fluorite assuming that prior to entering the mineralized strata the water had an ionic strength of less than 10-5 mol/L and contained negligible Ca2+ and negligible F-. For this part of the problem, neglect activity corrections. (Note that for each mole of CaF2 that is dissolved, you will get one mole of Ca2+ and two moles of F-.

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