4. The standard hydrogen Electrode (SHE)

• What is the E cell for SHE?

  0.00V
• Give the components if a standard hydrogen electrode

  • pressure of 100kPa
  • concentration at 1 moldm-3
  • Temperature 298k
  • Platinum electrode
• Give the cell notation of hydrogen electrode

  Pt(s)| H2(g)|H+(aq)
• Give the equation of hydrogen electrode equilibrium

  H2(g) ~ 2H+(aq) + 2e-
• Why is platinum used in SHE?

  equilibrium does not include a conducting metal surface so platinum is used ( able to absorb hydrogen gas)
• why are standard conditions needed ?

  Position of the redox equilibrium will change with conditions