The voltage generated by the zinc concentration cell described by the line notation
Zn(s)|Zn^(2)^(+)(aq,0.100M)||Zn^(2) (aq, ? M) |Zn(s)
is 21.0 mV at
25\deg C
. Calculate the concentration of the
Zn^(2)+(aq)
ion at the cathode. concentration: