Electrolytic cell

background [prelab assignment: (16 points) due at the beginning of the lab]

1. download / save *.swf file, use Ruffle to simulate running an electrolytic cell with Zn(NO3)2 for 10 minutes

i. Zn cathode and Zn anode

ii. Ag cathode and Zn anode

iii. Za cathode and Ag anode

at 1.8 V and 1.0 A; record obsevations as screen shots. [6 points]

2. rationalize [10 points]

i. qualitatively and quantitatively, the similarities and differences in the mass of the electrodes

ii. qualitively, the similarities / differences in the [Cu+2]

at the end of the simulations

 

purpose

compare:

materials

electrodes= Cu & C (student determines which is the cathode vs. anode,  i.e. how to connect electrodes to voltage source)

water; acidic solution of copper (II) sulfate (10 g CuSO4 * 5 H2O + 2.5 mL concentrated H2SO4 q.s. 100 mL)

variable power supply; balance; 100 mL volumeric flask

methods / data analysis

student design; recommend ~ 0.5 A @ 20 minutes, so plate ~ 200 mg Cu onto electrode

Content of the lab report [25 points]

hypothesis & basis

data table of your experimental measurements:  # gram Cu plated onto C electrode in high vs. low [Cu2+ ]

calculations for experimental & theoretical # grams of copper plated onto the carbon electrode

statistical analysis [see purpose] & interpretation, i.e. validity of your hypothesis 

error analysis:  compare theoretical vs. experimental amount of Cu plated onto electrode

resources:

lab activity source (examples):  site 1 & site 2  [access 4 / 2009]