(a) Aqueous solutions of copper(II) sulfate contain the [Cu(OH 2 ) 6 ] 2+ ion. The pH...
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(a) Aqueous solutions of copper(II) sulfate contain the [Cu(OH2)6]2+ ion. The pH of a 0.10moldm−3 aqueous CuSO4 solution is 4.17. Explain the reason why the solution is acidic, and determine Ka for the [Cu(OH2)6]2+ ion.
(b) When NH3 is added to aqueous CuSO4, the complex [Cu(OH2)2(NH3)4]2+ is ultimately formed. Initially, however, addition of NH3 results in the formation of a precipitate of Cu(OH)2 (Ksp = 2.20 × 10−20). What is the origin of [OH]– ions in this solution, and why does Cu(OH)2 form? [Other data: for NH3, Kb = 1.8 × 10−5]
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a Explanation of Solution Acidity and Determination of Ka for CuOH262 The pH of a solution is a measure of its acidity or basicity In this case the pH ...View the full answer
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