Full Lab Manual
Introduction & Goals
Chemistry & Background
In Your Write-up
1. The complex salt Cu(NH3)4SO4⋅H2O can be prepared by direct combination of its constituents:
Cu2+ + 4 NH3 + SO42– + H2O Cu(NH3)4SO4⋅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?
Trustees of Dartmouth College, Copyright 1997-2011