what are two applications of electrochemical series

Two common applications of the electrochemical series are:

1. Predicting feasibility of redox reactions / displacement reactions
   • From the electrochemical series, a species with higher (more positive) standard reduction potential tends to get reduced, while one with lower (more negative) potential gets oxidized.

 * This lets you predict whether one metal will displace another from its salt solution and whether a given redox reaction will occur spontaneously.

2. Designing galvanic cells and calculating EMF of cells
   • By choosing two half-cells from the series, you can identify which will act as anode and cathode and then calculate the standard cell potential using Ecell∘=Ecathode∘−Eanode∘E^\circ_{\text{cell}}=E^\circ_{\text{cathode}}-E^\circ_{\text{anode}}Ecell∘​=Ecathode∘​−Eanode∘​.

 * This is used in designing batteries and understanding how much voltage a particular cell can produce.

These two points are usually accepted as standard “applications of electrochemical series” in exam-style questions.