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Electrolysis
with every available resource show the importance of the concept of MOLE to electrolysis.
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Honestly you are gonna have to read a txtbk before automatically posting this sortof thing
start with univalent half equations see one above - silver wd begood Ag
use yr txtbk version of m = zIt - m is mass, I is current and t is time
realise that It is also quantity of charge - coulombs - in appropriate units (SI or MKS)
do a second example with a divalent ion - Calcium, Ca++ or Cu++ or Fe++ or -
realise that now with two ='s you need twice the charge for the same amount of molecules
do a third with aluminium - yeah correct trivalent Al+++
so it is a third of the numberr of mols/moles in ex one
god I used to find electrochemistry tedious
and depending on the units of z - yr answer is in gm or kg or moles
and to convertone to the other you have to divide by the atomic wt of th metal
and I think that is a basic skeletion.......
the problem os asking us olds in this particular branch
is that we were taught in things called equivalents
wh is confusing and you definitely dont need
{ The other thing is terminology wh you just as well get right from the start....
remember that metals dont really have a mol wt: something like Ag has an atomic weight ( erm same thing buyt silver does not go around in molecules)
NaCl which is ionic doesnt have a mol wt either because it never goes around as a molecule - THAT has a gm ionic wt (same calculation - 58.5 I think). I think you are getting the message - mol wt is only to be used for erm molecules. ]
start with univalent half equations see one above - silver wd begood Ag
use yr txtbk version of m = zIt - m is mass, I is current and t is time
realise that It is also quantity of charge - coulombs - in appropriate units (SI or MKS)
do a second example with a divalent ion - Calcium, Ca++ or Cu++ or Fe++ or -
realise that now with two ='s you need twice the charge for the same amount of molecules
do a third with aluminium - yeah correct trivalent Al+++
so it is a third of the numberr of mols/moles in ex one
god I used to find electrochemistry tedious
and depending on the units of z - yr answer is in gm or kg or moles
and to convertone to the other you have to divide by the atomic wt of th metal
and I think that is a basic skeletion.......
the problem os asking us olds in this particular branch
is that we were taught in things called equivalents
wh is confusing and you definitely dont need
{ The other thing is terminology wh you just as well get right from the start....
remember that metals dont really have a mol wt: something like Ag has an atomic weight ( erm same thing buyt silver does not go around in molecules)
NaCl which is ionic doesnt have a mol wt either because it never goes around as a molecule - THAT has a gm ionic wt (same calculation - 58.5 I think). I think you are getting the message - mol wt is only to be used for erm molecules. ]
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