OBJECTIVES:
              
   1.) 	To assemble several representative "wet cells" using 
	copper, zinc and magnesium electrodes to establish
	a hierarchy of reduction potentials (SRPs) for these 
	metals and their respective metal ion solutions.

   2.) 	To test several experimental electrodes brought in from
	home and compare them with the provided electrodes.

   3.)	To develop a practical mastery of voltaic cells (batteries)
	by using various metal electrodes, metal ion solutions,
	a salt bridge and a voltmeter.

MATERIALS AND EQUIPMENT:

   1.) 	Each member of your group should bring in a 
	potential metal electrode (not copper, zinc or magnesium)
	from home.  Choose from metal objects which you have some
	familiarity with and which you think will conduct electricity.
	
   2.) 	A voltmeter with connecting red and black connecting wires.

   3.)	Copper, zinc and magnesium electrodes with connecting wires.

   4.)	Metal ion solutions of copper(II), zinc(II) and magnesium(II).

   5.)	Salt bridges and potassium nitrate solution.



PROCEDURES:

   1.)	Using the textbook and/or the CD-ROM Interactive Chapter(20)
	assemble the three possible "wet cell" combinations using 
	copper, zinc and magnesium electrodes, the corresponding metal 
	ion nitrate salt solutions, a filter paper salt bridge
        saturated with potassium nitrate solution and 
	a voltmeter with red and black connecting wires.

   2.)  Assemble "wet cells" using your groups' three electrodes 
	brought in from home.  Assemble as few or as many combinations
	as necessary using the provided electrodes.  Potassium nitrate
	should be used as your metal ion solution for each electrode
	brought from home.  	 

   
                 





		    


		    


		    LAB REPORT 3 
		     	 (25 POINTS)	       

Name_________________Section________________Date________________
					


I.  FUNDAMENTALS
	

   A. 	(3 points) Write the Standard Oxidation Potential(SOP)
	half-reaction for each of the provided metal electrodes:


   1.     copper _____________________________________________

   2.	    zinc______________________________________________

   3.  magnesium______________________________________________



   B.   (3 points) Write the Standard Reduction Potential(SRP)
	half-reaction for each of the provided metal electrodes:

   
   1.     copper ______________________________________________

   2.	    zinc_______________________________________________

   3.  magnesium_______________________________________________



II.  DATA COLLECTION


   A.   (3 points) List the observed potentials for the three 
	metals 	provided: 
		  
        Anode Metal        Cathode Metal       Potential(volts)
		      

   1.  ______________ + ____________________   __________________


   2.  ______________ + ____________________   __________________
 

   3.  ______________ + ____________________   __________________



   B.   (3 points) Using the potentials above list the SRP 
	half-reactions for the three metal electrodes provided 
	in the proper order of reduction (highest SRP to lowest 
	SRP; most easily reduced to most easily oxidized): 
		  

   1.  _______________________________________________________


   2.  _______________________________________________________

 
   3.  _______________________________________________________



   C.   (7 points) List the observed potentials for the three 
	metals you brought from home combined together or with 
	the three metals provided(restrict choices to seven 
	combinations): 
		  
        Anode Metal        Cathode Metal	Potential(volts)

		      
   1.  ______________ + ____________________   __________________


   2.  ______________ + ____________________   __________________


   3.  ______________ + ____________________   ___________________


   4.  ______________ + ____________________   ___________________


   5.  ______________ + ____________________   ___________________

 
   6.  ______________ + ____________________   ____________________



   7.  ______________ + ____________________   ____________________


III.  RESULTS
   (6 points) Using the potentials above list the SRP 
	half-reactions for all six metal electrodes  
in the proper order of reduction (highest SRP to
	lowest SRP; most easily reduced to most easily oxidized): 
		  

   1.  _______________________________________________________


   2.  _______________________________________________________

 
   3.  _______________________________________________________


   4.  _______________________________________________________


   5.  _______________________________________________________

 
   6.  _______________________________________________________