soubility questions (precipiate or dissolve)?
2009-03-15 7:07 am
100g of MgF2 is added to 1L of water. What is the mass of MgF2 dissolved given that Ksp=3.7X10^-8 for MgF2 in water? will it dissolve or precipitate? I'm a little confused with finding the mass dissolved. Can someone please explain to me how to do it?
回答 (2)
2009-03-15 2:04 pm
✔ 最佳答案
Ksp = 3.7 x 10^-8 = (x)(2x)^2 = 4 x^3x = molar solubility = 0.0021 M
moles MgF2 that can be dissolved in 1 L = 0.0021 x 62.3018 g/mol = 0.131 g
If you add 100 g to 1 L precipitation occurs
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