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
), 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
dissociated Ions we can take directly = 80.0 % thpNoS
not dissociated Ions we must
convert back: 20% / z = 20% / 2 = 10.0 % thpNoS
c.) Total = 90.0 % thpNoS
In case all
would be MgCl2
) the line b.) must look:
==> 20% / z = 20% / 3
= 6.66 % thpNoS
How big is now the Error I have done for simplification, approximately?