2.   A sample containing 0.0

timer Asked: Dec 10th, 2015

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2.   A sample containing 0.0500 mol of Fe2(SO4)3  is dissolved in enough water to make 1.00 L of solution.  This solution contains hydrated SO42- and Fe(H2O)63+ ions.  The latter behaves as an acid according to the equation:

  Fe(H2O)63+ (aq)  ↔  Fe(H2O)5OH2+ (aq)  + H+ (aq)

a.   Calculate the expected osmotic pressure of this solution at 25° C if this acid dissociationis negligible.

b.  The actual osmotic pressure is of the solution is 6.80 atm at 25° C.  Calculate the Ka for the acid dissociation reaction of Fe(H2O)63+, assuming no ions cross the semipermeable membrane.

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