82 



G. J. BURROWS. 



Av = 



(x + y) - z 



(x + y) 



Table XII. — Formamide in water. 



Per cent 

 cone, of 

 Form- 

 amide. 



A 



Temp. 20° C. 



Temp. 25° C. 



di 



v s 



A v 



di 



^8 | Av 



0-73 



1-70 



4-10 



14-73 



25-70 



37-11 



4652 



59-05 



66-86 



75-94 



88-27 



94-82 



97-48 



99-77 



100-00 



0-7332 

 1-7251 

 4-2770 

 17-274 

 34-584 

 59-016 

 86-976 

 144-229 

 201-709 

 315-699 

 752-19 

 1831-6 

 3863-1 

 42160-0 



0-999321 



1-000858 



1-004545 



1-020458 



1-036469 



1-05254 



1-06541 



1-08216 



1-10408 

 1-11979 

 1-12846 

 1-13204 

 1-13507 

 1-13552 



•8515 

 •8467 



•8482 

 •8536 

 •8580 

 •8625 

 •8660 

 •8702 



•8753 

 •8786 

 •8799 

 •8803 

 •8807 

 •8807 



•000212 



•000576 



•00134 



•00405 



•00601 



•0O7O5 



•00722 



•00663 



•00446 

 •00206 

 •000859 

 •000394 



•998136 

 •999558 

 1-003115 

 1-018488 

 1-03397 

 1-04963 

 1-06226 

 1-07859 

 1-08874 

 1-10020 

 1-11580 

 1-12427 

 1-12783 

 1-13090 

 1-13126 



•8561 

 •8559 

 •8556 

 •8598 

 •8637 

 •8676 

 •8706 

 •8746 

 •8766 

 •8792 

 •8820 

 •8833 

 •8837 

 •8840 

 •8840 



•000203 



•000475 



•00116 



•00362 



•00537 



•00632 



•00655 



•00594 



•00532 



•00401 



•00191 



•000745 



•000347 



It will be seen from the above table, that whereas the 

 value of v s increases with concentration for solutions 

 containing more than one per cent formamide, the actual 

 specific contraction of the system also increases up to 44 per 

 cent, formamide and then decreases (Fig. 1). Between 

 these concentrations therefore, the values of v s would lead 

 to the inference that the specific volume of the system 

 increased with concentration, whereas the reverse is really 

 the case. 



Similar conclusions can be drawn from results obtained 

 by mixing ethyl alcohol with water, and considering the 

 solution as one of alcohol in water. The results obtained 

 in this case are given in the following table. 



Table XIII. 

 Ethyl alcohol in water. Temp. 30° C. 



Per cent, alcohol. A 



rfi 



Vs 



*v 



u 



25-44 



34-1123 



•955387 



• 1-1708 



•02602 



30-47 



43-8186 



•946572 



1-1754 



•02952 



36-62 



57-7890 



•934695 



1-1832 



•03231 



47-11 



89-0805 



•912305 



1-1992 



•0339 



58-89 



143-232 



•885436 



1-2167 



•03233 



100-00 



. .. 





1-2808 



, . . 



