Suppose that 2.25 grams of CuSO4 are dissolved in 930 mLs of 0.30 M ammonia. What concentration (Molarity) of Cu2+ ion is expected to be free in the aqueous solution and not bound to ammonia in the complex ion Cu(NH3)42+? The Kf for Cu(NH3)42+ is 5.0 x 1013. (Hint: assume before you set up the equilibrium that all the copper ion from the copper (II) sulfate forms a complex with the available ammonia in solution.)
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