The electrochemical series

Question 1

What is the difference between a reducing agent and an oxidising agent?

Answer 1

• reducing agent
  
  • reduces something else
  • must give electrons to it
  • best reducing agent, most -ve value
• oxidising agent
  
  • oxidsies something else
  • takes electrons
  • most +ve

Question 2

How would a Fe²⁺ / Fe³⁺ system be set up?

Answer 2

• inset platinum electrode into beaker containing both iron(II) and iron(III)
• both 1 mol dm^-3

Question 3

Draw the cell diagram for Fe²⁺ / Fe³⁺ compared to SHE?

Answer 3

Pt(s) I H2(g) I H⁺(s) II Fe³⁺(aq), Fe²⁺(aq) I Pt(s)

• use a comma
  
  • no difference in phase

Question 4

Why does tje emf change when the electrodes are connected and currfent flows?

Answer 4

• conc of ions changes
• emf determined when no cuurrent flows

Question 5

Where are the reducing agent found? Do the best reducing agents are -ve or +ve

Answer 5

• right
  
  • gives away electrons
• most -ve

Question 6

Where are the best oxidising agents foud? what is the value of them?

Answer 6

• left
  
  • accepts electrons
• most +ve
  
  • eqm most likely to be shifted to the right