Pourbaix diagrams

Question 1

What is plotted on the Y axis?

Answer 1

E0 / Volts

Question 2

What is plotted on the X axis?

Answer 2

pH

Question 3

What do the different colours in a pourbaix diagram represent?

Answer 3

Which species are stable in the conditions of that region

Question 4

In the pourbaix diagram for Iron in water at varying pH’s, what does the bottom boundary line represent?

What happens below this boundary line?

Answer 4

Boundary line for the stability of H2O

Below this line H2O is reduced to H2

Question 5

In the pourbaix diagram for Iron in water at varying pH’s, what does the top boundary line represent?

What happens below this boundary line?

Answer 5

Boundary line for the stability of H2O

Above this line H2O is oxidised to O2

Question 6

What do the Vertical lines on a pourbaix diagram represent?

Answer 6

Phase boundary Redox potentials

Question 7

What do the Horizontal lines on a pourbaix diagram represent?

Answer 7

Proton transfer

Question 8

What is a Pourbaix diagram intended to map out?

Answer 8

Used to map out possible stable (equilibrium) phases of an aqueous electrochemical system.