Hazards:
Conc. HCl is corrosive and toxic. Use care.
Chemicals and Solutions:
1 M CuSO4 solution
Concentrated HCl
Materials:
2 Test tubes
Eyedropper
Distilled water
Procedure:
Add some copper solution to one test tube
Add some water to the solution - nothing happens except the solution gets more dilute.
Add some copper solution to the other test tube and add some concentrated HCl to the solution - it will turn green.
Add some water to the now green solution and it will turn blue again.
Hint:
Discussion:
CuSO4 + 4Cl- ---> [CuCl4]2- (green)
[CuCl4]2- + 6H2O ---> [Cu(H2O)6]2+ (blue)
To schedule a demonstration, please send an email to the demonstration lab.
Contact:
Eric Camp
Lecture Demonstration Technician
Bagley Hall 171
(206) 543-1606