Redox Potentials

Question 1

Do reductants tend to have a more or less positive reduction potential than oxidants?

Answer 1

More negative

Question 2

Which directions do electrons flow in?

Answer 2

The direction of increasingly positive reduction potential

Question 3

What is redox potential?

Answer 3

The ability of a molecule or ion to donate electrons or accept electrons expressed quantatively

Question 4

What represents redox potential?

Answer 4

E

Question 5

What is E_m?

Answer 5

The E where [oxidised]=[reduced]

Question 6

What conditions are used in a standard hydrogen electrode?

Answer 6

• 1 atm
• 298k
• 1M solutions

Question 7

What pH is a standard hydrogen electrode measured at?

Answer 7

0

Question 8

What is the redox potential of SHE?

Answer 8

0V

Question 9

What pH are most standard reduction potentials measured at in biochemistry?

Answer 9

pH7

Question 10

A hydrogen electrode at pH7 has a standard potential of what compared to SHE?

Answer 10

-0.43 V

Question 11

If E⁰’ is negative which side of the equation is favoured?

Answer 11

Left side

Question 12

If E⁰’ is positive which side of the half equation is favoured?

Answer 12

The right side

Question 13

What type of reactions are half equations always written as?

Answer 13

Reductions

Question 14

What is a redox pair?

Answer 14

The reactants in a redox reaction