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Question & Answer: What is the molar solubility of Fe(OH)3 in a solution thatvis buffered at pH 2.50…..

Question 23 (1 point) What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.50 at 25 °C? The Ksp of Fe(OH)3 is 6.3 × 10-38 at 25°C. 6.9 × 10-28 mol/L 2.0x 10-26 mol/L 1.3 × 10-13 mol/L 2.0 × 10-3 mol/L 5.0 x 102 mol/L Save

What is the molar solubility of Fe(OH)3 in a solution thatvis buffered at pH 2.50

Expert Answer

Answer

pH = 2.50

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pOH = 14-pH = 14-2.50 = 11.5

pOH = -log[OH–]

[OH–] = antilog(-pOH)

= antilog(-11.5)

[OH–] = 3.16*10-12M

Let the solubility be S moles/L

Fe(OH)3 <—> Fe3+ + 3OH–

Ksp = [Fe3+][OH–]3

6.3*10-38 = S*(3.16*10-12)3

S = 6.3*10-38 / 31.55*10-36

S = 1.99*10-3mol/L = 2.0*10-3mol/L

Option D

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