Redox Equilibria Flashcards
What is used to measure the voltage of a simple cell?
Why?
High resistance galvinometer
Prevents the flow of current
What is used if there is no solid compound to used as an electrode
Platinum eletrode
Why are platinum electrodes used?
- Inert
- Good eletrical conductivity
What is the purpose of the salt bridge?
Completes the circuit
What is the setup of the standard hydrogen electrode?
How do fuel cells work?
- Uses hydrogen and oxygen
- Hydrogen split into protons and electrons and electrons flow around the circuit
- At the other side, proton join with oxygen and electrons to form water
What are the benefits of fuel cells?
- They don’t need recharging
- Only produce water
What are the downsides to fuel cells?
- Energy is needed to produce hydrogen and oxygen, usually from fossil fuels
- Hydrogen is explosive, creating safety issues with transportation and storage
What is the order of the electrodes in a cell diagram?
Without SHE:
Anode || Cathode
With SHE:
SHE || Other electrode
What is the order of the species in a cell diagram?
Least oxidised | Most oxidised || Most oxidised | Least oxidised
How can the direction of a reaction be determined from Eº values?
The couple with the most positive Eº goes as a reduction
A reaction is spontaneous if
Ecell > 0
