Which is a possible electrochemical cell, shown in correct notation?
A. Cd(s) | Cd2+(aq) || Cu2+(aq) | Cu(s)
B. Mg(aq) | Mg2+(aq) || Pb2+(aq) | Pb(aq)
C. Ag(s) | Ag2+(aq) || Pb3+(aq), Pb2+(aq) | Pt(s)
D. Ag2+(s) | Ag2+(aq) || Pt(s) | Pb3+(aq), Pb2+(aq)
E. Fe(s) | Fe3+(aq) || Zn(s) | Zn2+(aq)
I would pick A.
B no, Mg reacts with H2O.
C no, It's Ag^+, not Ag^2+
D no, there is no Ag^2+ swolid
E no, should be Zn2+(aq)|Zn(s)
To determine which electrochemical cell is represented in correct notation, we need to understand the notation used for electrochemical cells.
The general notation for an electrochemical cell is:
anode (oxidation) | anode solution || cathode solution | cathode (reduction)
In this notation, the anode is where oxidation occurs, and the cathode is where reduction occurs. The double line represents a salt bridge or a porous barrier that allows the flow of ions to maintain charge balance during the redox reaction.
Now, let's analyze each option given:
A. Cd(s) | Cd2+(aq) || Cu2+(aq) | Cu(s)
This notation follows the correct format, with the anode being Cd(s) and the cathode being Cu(s). Therefore, option A is a possible electrochemical cell in correct notation.
B. Mg(aq) | Mg2+(aq) || Pb2+(aq) | Pb(aq)
This notation does not have a solid electrode for either the anode or cathode, which is required for an electrochemical cell. Therefore, option B is not a possible electrochemical cell in correct notation.
C. Ag(s) | Ag2+(aq) || Pb3+(aq), Pb2+(aq) | Pt(s)
This notation has multiple ions at the cathode, which is not appropriate for an electrochemical cell. Therefore, option C is not a possible electrochemical cell in correct notation.
D. Ag2+(s) | Ag2+(aq) || Pt(s) | Pb3+(aq), Pb2+(aq)
This notation has a solid ion (Ag2+(s)) at the anode, which is not possible. Solid ions cannot exist in an electrochemical cell. Therefore, option D is not a possible electrochemical cell in correct notation.
E. Fe(s) | Fe3+(aq) || Zn(s) | Zn2+(aq)
This notation follows the correct format, with Fe(s) as the anode and Zn(s) as the cathode. Therefore, option E is a possible electrochemical cell in correct notation.
In summary, options A and E are the possible electrochemical cells in correct notation.