Main Characteristics of Etectrochemical Series Chemistry Notes
Main Characteristics of Electrochemical Series :
The main characteristics of electrochemical series are as follows:
→ The standard reduction potential of that metal is more positive (or less negative) than standard hydrogen electrode, its cation is relatively more strong oxidant ie, the tendency of it to accept electron is relatively high. For example, Ag+ ion is more strong oxidant than Cu2+ ion and Cu2+ ion is more then Zn2+ ion.
→ The metal ion which is weak oxidant than hydrogen ion (H+), that is placed above Htion in electrochemical series and the metal ion which is strong oxidant than H+ ion, then it is placed below H+ ion in series. For example, Lit ion is weak oxidant than H+ ion but Cu2+ ion is strong oxidant than H+ ion.
→ The standard electrode potential ie, standard reduction potential of that metal is more negative than standard hydrogen electrode, it is relatively more strong reductant i.e., it has relatively more tendency to lose electrons. For example, Li metal is more strong reductant than Zn metal and Zn metal is more than Cu metal.
→ Note The reducing power of metals i.e., the tendency to lose electrons decreases from top to bottom in electrochemical series.
→ Those metals which are weak reducing agents than hydrogen gas, are placed below hydrogen gas in electrochemical series and their sign of standard reduction potential is positive than standard hydrogen electrode. For example, Cu is placed below hydrogen in series. It is weak reducing agent than hydrogen.
→ Those metals which are more strong reducing agents than hydrogen gas, are placed above hydrogen in electrochemical series and their sign of standard reduction potential is negative than standard hydrogen electrode. For example, Li is placed above hydrogen gas in series. So, it is more strong reducing agent than hydrogen gas.
The oxidising power of metal ions ie, tendency to accept electron increases from top to bottom in electrochemical series.