1200 
Chemistry. — “Equilibria in ternary systems” IV. By Prof. F. A. H. 
SCHREINEMAKERS. 
(Communicated in the meeting of January 25, 1913). 
We consider a liquid Z, saturated with the solid substance Fand 
in equilibrium with the vapour G. We allow this tiquid to proceed 
along a straight line which passes through the point F. 
If we call dn the quantity of solid substance / that dissolves in 
the unit of quantity of the liquid, we get: 
de = (a—x) dn dy = (8—y) dn 
If we substitute these values in (6) (II) and (7) (II)') we have: 
2M Sdn ALP BATEN So oe ee 
EN Sdn = CoP 2 Dal»... ereen 
where for the sake of brevity: 
M = («#-—a)'r + 2(e—a) (y—B)s + (y—B)"t 
N = (#,—2)(e—a)r + ely) + Bs + (Yr ~ WY ~B) 
From this follows: 
DM—BN DM—BN de 
APS tS ee Oe eee (3) 
BC —AD BC— AD a—e 
CM—AN CM—AN de 
at = an = = (4) 
BC—AD BCL AD de 
dP DM—BN ; 
= (5) 
dT CM—AN 
As in the previous communication, we assume the very probable 
case that BC—AD is positive. 
u 
If now we call ee and y= then M=0, N=0 and —_=0, 
a— x 
N Jen 
but ——— does not become O as a rule. If we call. tgp =" we 
at Ati bs 
get: 
Bl(e, —e)r + (y,—8)s (ee — a)s + (y,—B)h tap 
OP Ke ) en ö) +i, e ) J1 BE tag | Ne (6) 
BC—AD 
and for dT’ a same form with this difference that in the numerator 
B has been replaced by A. 
To perceive the significance of this we take fig. 1 in which the 
closed eurves indicate the boiling point lines of the solutions saturated 
with F. The exphased ones, as has been stated previously, have 
1) The figures (I), (I), and (III) refer to the former communications. 
