topic 8 Flashcards
in a redox equation what is on the LHS
oxidised thing
higher + charge value
in a redox equation what is on the RHS
the reduced thng
lower + charge value
redox equations are written as
reductions
gaining of an e- from left to right
more positive to less positive
hard ligands stabilise what oxidation state (less polarisable molecule)
stabilise the higher oxidation state
soft ligands stabilise what oxidation state
they stabilise the lower oxidation state
relationship between the stability constant and the redox potential
🔺G = -RT ln(k). = -nFE
in order for a reaction to be spontaneous, what value must 🔺G have
must be a negative value
k in a reversible redox equation in equilibrium
‘[products]’ // ‘[reactants]’
what does a higher k value mean
the formward reaction is favoured
bc products would have a higher conc
a higher k value means what in terms of gibbs
a higher k value means a larger negative value
gibbs will be more negative, aka more spontaneous, drives the reaction from rea to products
what does a more positive E value mean
stronger oxidising agent
reduction is favoured
aka gain of an e- is favoured
this means the product is the favoured oxidation state
what does the oxidation state of the metal depend on
it depends on the ligands its bound to
in octahedral complexes,, what does the colour of the metal in an aqu solution depend on
🔺o
aka the energy gap between eg and t2g
the photon of light will only be absorbed if it is equal to this energy gap.
it then excites an e- from t2g to eg
what does the 🔺o dictate
the wavelength of light needed to excite an e- from t2g to eg.
the colour of the compound (the transition)
why is a range of wavlengths absorbed
electronic transitions occur many times during a bond vibration leading to a range of absorptions
