Flashcards in Electrochemistry Deck (10):
Why is platinum used?
Provides a surface for the reaction
What is a salt bridge?
U shaped tube that contains a salt solution to keep charges balanced
Define standard cell potential
Voltage measured when half cell is connected to a standard hydrogen half cell under standard conditions
What is EMF?
Potential difference between anode and cathode
What is the calculation?
Substract more negative Ecell from more positive
Reduction at more positive (cathode)
Oxidation at more negative (anode)
Cell potential > 0.4v
REDOX reaction only feasible if species that's more positive is able to be reduced
Limitation - not standard conditions or reaction occurs too slowly it doesn't appear to happen
X has more -ive E so X redox Eq has greater tendency to lose electron and moves to left
X eqm releases electron into wire, flow to Y which gains electron and Eq moves to right
What species acts as a more powerful oxidising agent?
What makes Ecell smaller?
Ag+/Ag more positive