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Calculate the standard Gibbs energy of reaction and the equilibriumconstant at 25°C for the following reactions 4. (a) (b) Fe3+ + 3OH-Fe(OH)3(s) Ca2+ + SO42-+2H20CaSO4:2H2O(s) 5. A) Calculate AG for the dissolution of ferrous hydroxide [Fe(OH)2(s)] into Fe and OH- ons. B) If an ideal solution containing 2 mg/LFe2 and 10 mg/L of the solid is at pH 7.0, in which direction will the reaction proceed? Fe(OH),(s) Fe2+ + 2 OH- 6. Consider systems where the following reactions are occurring under the conditions indicated

Explanation / Answer

(a)

Go(reaction) = G(Products) – G(Reactants)

Go(reaction) = G(-699 KJ/mol) – G(-4.60 KJ/ mol + 3*-157.3 KJ/mol)

Go(reaction) =-222.5 KJ /mol

Go(reaction) =-RT ln(K)

or K = e^(- Go(reaction) / RT)

R= 8.314510 J/k*mole

K = e^(- (-222500 J /mol) / 8.314510 J/k*mole *298 K)

K = e^89.8=9.99*10^38

(b)

Go(reaction) = G(Products) – G(Reactants)

Go(reaction) = G(-1797.2KJ/mol) – G(-553.54 KJ/ mol+ -744.6 KJ/mol + 2*-237.18J/mol)

Go(reaction) =-24.7 KJ /mol

Go(reaction) =-RT ln(K)

or K = e^(- Go(reaction) / RT)

R= 8.314510 J/k*mole

K = e^(- (-24700J /mol) / 8.314510 J/k*mole *298 K)

K = e^9.97=21375.5

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