Experiment: Copper(II) sulfate and ammonia 
        Strong and weak ligand
 

        
        
        First copper sulfate is poured in the test tubes..
        Ammonia is added progressively. From left to right, more and more ammonia is added.
        
         
        
  
  
 
 
  
    
  
First copper sulfate is poured in the test tubes..
  
  
 