Electrochemistry

Question 0

What is the definition of term standard electrode potential?

Answer 0

The e.m.f of a half cell compared with a standard hydrogen half cell.
Temp at 298K
Solution conc at 1 moldm-3
Pressure 1 ATM

Question 1

Suggest 2 advantages of using methanoic acid as a fuel in a fuel cell rather than hydrogen.

Answer 1

• Hydrogen is explosive
• Methanoic acid gives greater voltage
• Methanoic acid is liquid and hydrogen is gas, therefore HCOOH is easier to store and transport.

Question 2

Explain why some feasible reactions may not actually take place.

Answer 2

• The conditions may not be standard. E.g solution conc not at 1 moldm-3, temp not 298K
• due to high activation energy/ slow rate