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

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

Calculate the molar solubility in 0.050 M NaF solution.

Please show step by step instructions, thank you!

Expert Solution

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

queen_honey_blossom answered 10 months ago

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