Standard electrode potentials

Question 1

Why do electrode potentials have to be measured under standard conditions with a standard electrode?

Answer 1

As they are reversible, changing the position of equilibrium would affect the electrode potential

Question 2

What is used as a standard electrode for measuring the electrode potentials?

Answer 2

Hydrogen

Question 3

How does a standard hydrogen electrode work?

Answer 3

Hydrogen gas us bubbled through a solution of H+ ions

Question 4

What are the standard conditions required when measuring electrode potentials using standard hydrogen electrodes?

Answer 4

1) Concentration = 1.00 mol dm-3
2) Temperature = 298K (25 degrees)
3) Pressure = 100kPa

Question 5

What is the standard electrode potential?

Answer 5

The voltage measured under standard conditions when a half cell is connected to a standard hydrogen electrode

Question 6

What is the value for the electrode potential for the standard hydrogen electrode? Why?

Answer 6

0.00V

Zero by definition; Scientists decided it is that