Chapter 16 Laboratory: Electrochemistry 303RQEWEvI UESTIOnS
q 1 : Which of the electrodes is the anode and which the cathode?
q: 2 At which electrode does oxidation occur?
q: 3 What is the purpose of the tubing filled with sodium chloride solution?
q: 4 If you immerse a magnesium electrode in a solution of copper sulfate, metallic copper spontaneously plates out on the
electrode. If you place a copper electrode in a solution of magnesium sulfate, no such spontaneous reaction occurs. Why?
q: 5 If you substituted an aluminum electrode for the magnesium electrode, and a silver electrode for the copper electrode, what
voltage would you expect the cell to produce? Why?
q: 6 Did the voltage and/or current change when you altered the concentration of the electrolytes? Why or why not?
TABLE 16-6: Build a voltaic cell—observed data
Electrolyte concentration voltageCurrentA. 1.0 M Cu + 1.0 M Mg ___.____V____.___ mAB. 1.0 M Cu + 0.75 M Mg___.____V____.___ mAC. 0.75 M Cu + 0.75 M Mg___.____V____.___ mA