Week 5: Coordination Chemistry 1 Overview Getting Started Techniques Procedure FAQ Full Lab Manual Introduction & Goals Chemistry & Background Key Questions Prelab Problems Safety Procedure In Your Write-up Experiments Index ChemLab Home		Prelab Problems 1. The complex salt [Cu(NH3)4][SO4]•H2O can be prepared by direct combination of its constituents: Cu2+ + 4 NH3 + SO42- + H2O [Cu(NH3)4]SO4•H2O If an aqueous reaction solution contained 1.0 g CuCl2•2H2O, 1.0 mL 14 M NH3, and 1.0 g Na2SO4, what would be the maximum theoretical yield (in grams) of product? To what percent yield would 0.42 g of product correspond? 2. Your yield of crude product is 1.8 g and you need 20 mL of 1 M NH3 (aq) per gram of complex for the recrystallization step. How many mL of 1 M NH3 (aq) will you need? How much 6 M NH3 (aq) will you need to dilute to make this amount of 1 M solution? 3. For the yield of product given in Prelab Problem 2, what amount of 16 M nitric acid would need to be added to the solution to neutralize the added NH3 (aq)? How much 16 M nitric acid would be required for a 25% excess?
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