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

**% thpNoS**b.)

**20%** not dissociated Ions we must

convert back: 20% / z = 20% / 2

= 10.0 **% thpNoS**c.) Total = 90.0

**% thpNoS**In case

**all** would be MgCl

_{2} (z =

**3**) the line b.) must look:

==> 20% / z = 20% /

**3** = 6.66

**% thpNoS**How big is now the Error I have done for simplification, approximately?

Good Luck!

ARGOS

^{++}