Passage III
An electrochemical cell (Figure 1) is constructed with an anode, a strip of zinc (Zn) placed in a solution of zinc ions (Zn2+), and a cathode, a strip of copper (Cu) or silver (Ag) placed in a solution of copper ions (Cu2+) or silver ions (Ag1+) , respectively. The solutions are connected by a salt bridge (a tube filled with a solution containing nitrate ions). The anode and cathode are connected to a voltmeter. Tables 1 and 2 show how the mass (g) of the anode or cathode, concentrations (M) of the ionic solutions, and temperature (°C), affect the voltage difference(V) between Zn and either Cu or Ag.
12. Which of the following variables was NOT altered in the measurements of Cells 6-9?
Your Answer is
Correct Answer is J
Explanation
Looking at table 2, the constants in cells6-9 are mass of Zn anode and mass of Ag cathode, so choose J