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Chemistry

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Magnesium fluoride dissolves in water to the extent of 8.0 10-2 g/L at 25°C. Calculate the solubility of MgF2(s) in moles per liter, and calculate Ksp for MgF2 at 25°C.

I keep getting the same answer...please help!

  • Chemistry - ,

    It would have been far easier if you had posted your work, then I could have found the error.
    MgF2 ==> Mg^2+ + 2F^-
    solubility MgF2 = moles/L.
    moles = 0.08/molar mass MgF2.
    Ksp = (Mg^2+)(F2^-).
    Substitute and solve for Ksp. Post your work if you still have trouble. The most common mistake made by students on a problem such as this is not multiplying MgF2 by 2 to obtain F^-, then not squaring the F^-.

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