Calculate the molar solubility of Fe(OH)3 if its Ksp equals 4.0 × 10 38. A) 2.0...

Question

Question

Calculate the molar solubility of Fe(OH)3 if its Ksp equals 4.0 × 10 38.

A) 2.0 × 10 10 M B) 2.6 × 10 10 M C) 4.5 × 10 10 M D) 1.2 × 10 19 M E) 2.0 × 10 19 M

Answer 1

Answer #1

Ksp of Fe(OH)3 = s x (3s)³ = 27 s⁴

Given Ksp of Fe(OH)3 = 4.0 × 10³⁸

So, 27 s⁴ = 4.0 × 10³⁸

s⁴ = 14.81 x 10³⁶

s = (14.81 x 10³⁶)^1/4

S = 1.96 x 10⁹ M

Solubility = 2 x 10⁹ M approx

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Answer 2

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