481 
analysed. Although these determinations have only a qualitative value, 
we still think it worth while to communicate the result. 
Composition of the liquid. | Composition of the vapour. 
Boiling | | 
point =|] o Sul Pras i Oc Sra 
Bi ee | ‚in at.°/,Sn | me ein in at. 9/) Sn 
iss | 13 BG 2 0.4 
189 | 21 | Bae il 5 1.0 
| | 
201. | 55 DKN 14 2.8 
La A | Is 3.6 
deere er Bl | 1682 0 28 5.6 
270 91 | SA a 48 9.6 
Summary of results. 
1. The melting point of Snl, is 148,°5, the boiling point 340°. 
The melting point of Snl, is 320°, the boiling point 720°. 
2. In the action of Sn on I, there is at first an exclusive for- 
mation of Snl,. The reaction Snl, + Sn =?2 Snl, takes place with 
extreme tardiness and éven at 350° it still proceeds at a very 
slow rate. 
3. The melting point line of mixtures of Snl, and I consists of 
two branches with a eutecticum at 79°,6 and 60 °/, by weight of 
Snl, (12,06 at. °/, Sn). The boiling point line takes a regular course 
without a maximum or a minimum. 
4. Fused Snl, and Snl, form two liquid layers, the composition 
of which at 350° is: Snl, with traces only of Snl, and Snl, with 
at most 6°/, of Snl,. As Sn also is not perceptibly soluble in molten 
Snl,, this lies in a very narrow region of homogeneous mixing 
which, at 350°, extends trom 33,3 at. °/, Sn (pure Snl,) to 32,5 at. 
°/, on (SnI, + 6 °/, by weight of Snl,). 
Inorg. Chem. Laboratory 
Technical High School. 
Delft, Jane 1912. 
32 
Proceedings Royal Acad. Amsterdam. Vol. XV. 
