C. E. Lineharger — Viscosity of Mixtures of Liquids. 335 



curj. The distillate was collected in three portions of some- 

 what over a pound each, and their melting points found to be 

 5° -39 (corr.), 5° -40 (corr.), and 5° '42 (corr.) respectively. 



(5.) Five pounds of ether were washed about twenty times 

 with small portions of water, dried over fused calcium chlo- 

 ride, allowed to stand over mercury for a few days, and finally 

 distilled over sodium. Almost the total quantity distilled 

 within 0°-l. The portion which- had boiled almost constant 

 was again distilled, this time over phosphoric anhydride, and 

 the distillate collected in two portions, whose specific gravities 

 at 25°-0 referred to water of the same temperature were found 

 to be 0-70940 and 0*70942 respectively. 







Table II. 







Viscosity of Mixtures of Benzene (a. 1) and Toluene (c. /.) 











Temperature — 25°-0 







Molecular 









Percentage 



percentage 



Specific 



Calculated Observed 





composition. 



composition. 



gravity. 



viscosity. viscosity. 



Diff. 



CeHe CtHb 



CeHe C7TI8 









0-000 100-000 



0000 100-000 



0-86288 



0-00541 





10-991 89009 



12-719 87-281 



0-86434 



0-00547 0-00555 - 



-0-00008 



30-588 69-412 



34-229 65-771 



0-86635 



0-00558 0-00558 



000000 



66-576 33-424 



70-240 29-760 



0-87143 



000579 000579 



0-00000 



91-556 8-444 



92-750 7-250 



0-87528 



0-00594 0-00594 



0-00000 



100-000 0-000 



100-000 0-000 



0-87661 



0-00599 





{a. I.) About three pounds of benzene were treated with 

 sulphuric acid, and then subjected to fractional crystallization 

 until a little more than a pound was obtained melting at 5°-3 

 (uncorr.). Most of this, when distilled over sodium, boiled at 

 80° -1 (uncorr.) under a pressure of 756™™ of mercury. 



(c. I.) Of the quantity of toluene taken for purification 

 (about two pounds) more than four-fifths distilled at 109° '8 to 

 110°'l (uncorr.). After a couple of distillations over a little 

 sodium, more than a pound was obtained boiling almost con- 

 stantly at 110°*1 (uncorr.) under a pressure of 758™™ of mercury. 







Table III. 







Viscosity of Mixtures of Benzene {a. I) 



and Carbon Bisulphide (d). 









Temperature — 25°'0 







Molecular 









Percentage 



percentage 



Specific 



Calculated Observed 





composition. 



composition. 



gravity. 



viscosity, viscosity. 



Diff. 



CeHe CS2 



CeHe CS2 









0-000 100-000 



000 100-000 



1-25958 



0-00358 





8-872 91-127 



8675 91-325 



1-20897 



0-00379 000376 



+ 0-00003 



34-858 65-142 



34-270 65-730 



1-09314 



0-00456 000446 



+ 0-00010 



75-886 24-114 



75-409 24-591 



0-94176 



000541 000544 



-000003 



100-000 0-000 



100-000 0-000 



0-87661 



0-00599 





