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What hydrogen ion concentration should be required to dissolve 0.10M MgF2 if the Ksp for magnesium...

What hydrogen ion concentration should be required to dissolve 0.10M MgF2 if the Ksp for magnesium fluoride is 6.8x10^-9 and Ka for HF is 6.5x10^-4? There are two different answers on this website. One uses the M of Fe- times 2 and one just uses the M of Fe-. Which is the correct way? Please explain why. neither one took into accoutn the .10 M of MgF2.

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