422 



Dr. G. It. A. Wright on the Relations between 



Substance. 



Affinity-value. 



Boiling-point. 





If! Diff.=- 4-5 

 °JLt Diff. =4-10-3 

 ™o Diff. =4-22-5 



1067 Diff - ==+2 °* 5 



fit r Diff. =■■ — 35 



\\ Diff. =-f 13 



,*X Diff. =+ 54 



350 Diff. =4-218 



Methylic alcohol . . . 



Ethylic alcohol 



Amylic alcohol 



Cetylic alcohol 



It should result, therefore, that marsh-gas has a higher boil- 

 ing-point than hydrogen, t. e. will be more readily condensed to 

 a liquid. 



34. Similarly, an acid always boils at a higher temperature 

 than the corresponding methylic ether, and, as previously shown 

 (§ 28), has a higher affinity-value. The corrected affinity-values 

 are chosen in the following instances : — 



Substance. 



Affinity-value. 



Boiling-point. 



Formic acid 



Methyl formate 



«?} Diff. =-29-2 

 '«} Diff. =-23-0 



loll] Diff -="^- 3 



Mo'o] Diff. =-39-5 



'«} Diff. =-72 

 "«} Diff. =-61 

 1} Diff. =-61 

 }«} Diff =-61 





Methyl acetate 





Methyl butyrate 







So also with the ethylic sethers :- 



Substance. 



Affinity-value. 



Boiling-point. 





g*} Diff. =-11-2 

 !>f|} Diff. = -18-5 

 liol} Diff. =-36-3 

 \JH} Diff. =-35-1 



m Diff. =-50 

 U 7 l} Diff. =-43 

 Iff} Diff =-41 

 111} Diff. =-43 













Valeric acid 





In the case of the amylic ethers the rule also holds, but in the 

 inverse direction, the ether boiling at a higher temperature than 

 the acid, and having a higher affinity-value : — 



Substance. 



Affinity-value. 



Boiling-point. 





1!H] »»• =+*•* 



mi} Diffi =+ 1 ' 8 



]H} Diff. =+16 

 III} Diff. =+12 





Valeric acid 



Am yl valerate 



