Which of the following experimental oberservations is wrong about the Daniell cell?

Options

A. The initital voltage is `1.100 "volts"`
B. The anode has a positive sign while the cathode has a nagative sign.
C. The mass of the zinc electrode decreases while the concentration of `Zn^(2+)` ions increases in the solution around the zinc electrode as the cells operates
D. The mass of the copper electrode increases while the concentration of `Cu^(2+)` ions decreases in the solution around this electrode as the cell operates.

Answer

B

Explanation

Electrons are released at the anode and consumed at the cathode. Therefore, they flow through the wire from anode to cathode, as in all electrochemical cells. In all galvanic cells the electrons flow spontaneously from the negative electrode to the positive electrode. Thus, in contrast with electrolytic to the positive electrode. Thus, in contrast with electrolytic cells, the abode is negative and cathode is positive.
The Zn electrode loses mass because some Zn metal is oxidized to `Zn^(2+)` ions, which go into solution. Thus the Zn electrode is the anode. At the cathode, `Cu^(2+)` ions are reduced to Cu metal. This plates out on the electrode so its mass increases.