The voltage series


The voltage series is the redox table showing the metals(reductants, reducing agents) and their usual cations (oxidants, oxidizing agents) including the couple ($H^+$/$H_2$)


Each oxidant (left) can react with each reductant (right) situated below


Iron and copper(II) cation:

An iron rod introduced in a solution of copper(II) sulfate becomes covered with a red copper layer:
$Cu^{2+}+2e^- \longrightarrow Cu$
$Fe-2e^- \longrightarrow Fe^{2+}$
$Cu^{2+}+Fe \longrightarrow Cu + Fe^{2+}$

Copper and silver cation:

A copper sheet introduced in a silver nitrate solution becomes covered with a black silver layer:
$Ag^++e^-\longrightarrow Ag$
$Cu-2e^-\longrightarrow Cu^{2+}$
$Cu +2Ag^+\longrightarrow Cu^{2+}+2Ag$

Zinc and lead nitrate:

Zinc pellets introduced in a lead nitrate solution becomes covered with black lead cristals:
$Pb^{2+}+2e^-\longrightarrow Pb$
$Zn-2e^-\longrightarrow Zn^{2+}$
$Zn +Pb^{2+}\longrightarrow Zn^{2+}+Pb$