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For a magnesium fluoride, MgF2, Ksp= 6.4x10^-9, calculate the molar solubility in pure water. Calculate the molar...

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Chemistry

For a magnesium fluoride, MgF2, Ksp= 6.4x10^-9, calculate themolar solubility in pure water.

Calculate the molar solubility in 0.050 M NaF solution.

Please show step by step instructions, thank you!

Answer & Explanation Solved by verified expert
4.2 Ratings (537 Votes)

MgF2 --------> Mg+2 (aq) + 2F- (aq)

                        s                 2s

Ksp    = [Mg+2][F-]2

6.4*10-9   = s*(2s)2

6.4*10-9     = 4s3

s3                   = 1.6*10-9

s               = 1.17*10-3 M

solubility of mgF2 is 1.17*10-3 M

MgF2 --------> Mg+2 (aq) + 2F- (aq)

                        s                 2s

                        s                 0.05 +2s

Ksp    = [Mg+2][F-]2

6.4*10-9   = s*(2s+0.05)2

     s             = 2.6*10-6 M

solubility of MgF2 in NaF is 2.6*10-6 M
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