Dear
Boostar;
You are doing a very miner mistake in reasoning. -
Not “of the total Species”! ─ But “of the thpNoS” instead!
100% Dissociation is giving us the “
theoretical possible Number of dissolved Species” (
thpNoS), in this case all are Ions. This theoretical value we are easy able to calculate!
80% Dissociation is only a general value telling us that in real we only have 80 % in the ionic form.
So the remaining Species must be dissolved as Molecules, and so we have two different but dissolved Species.
Now we are able to express all in %age of theoretical possible Number of Ions (=
% thpNoS):
a.)
80% dissociated Ions we can take directly = 80.0
% thpNoSb.)
20% not dissociated Ions we must
convert back: 20% / z = 20% / 2
= 10.0 % thpNoSc.) Total = 90.0
% thpNoSIn case
all would be MgCl
2 (z =
3) the line b.) must look:
==> 20% / z = 20% /
3 = 6.66
% thpNoSHow big is now the Error I have done for simplification, approximately?
Good Luck!
ARGOS
++