Page:Outlines of Physical Chemistry - 1899.djvu/188

 ��OUTLINES OF PHYSICAL CHEMISTEY

��Alcohols and Acids of the Fatty Series

�Heat of Formation

� � � � �I

\

� � � �Heat of

�Name

�Formula

� � � � �Combus-

� � �Gas

�Liquid

�Solid

�Dis- solved

�tion

� � �|

� � �Cal.

�Methyl alcohol CH.OH

�61-7*

�Ethyl „ ; C,H & OH

�69-9*

�Propyl „ ! C,H 7 OH

�78-6*

�Isopropyl „ 1 C s H 7 OH

� �80-6*

�Isobutyl „ C 4 H,OH

� �85-6*

�Amyl „

� � � � � �i

�(ordinary).

�C 5 H n OH

�91-6*

�793-9 i

�Capryl alcohol CgH 17 OH

� �113-3*

� � �1,262-1 !

�Glycerine. C s H 8 O s

!

iioo°

�161-7*

�101-6*

�]

�/ ] at

'. v 120°

�\

� � � �Acetic „. j C^O-j

�117-2*

� �.

�122-5*

�,

�128-8*

� �135-2*

�Palmitic „.

�CjgHsjOj,

� � �( 2410*

�2,371-8?, 2,398-4?

�Stearic „.

�G i*R*fi'2 j

� �1 227-6*

�I

�2,677-8?!

2,711-8?

I

��N.B. — The heats of formation marked with an asterisk (*) are those which have been directly derived from the heats of combustion.

��Organic Acid Esters. — Their heat of combustion is generally a little higher than the sum of the heats of com- bustion of the alcohol and of the acid. The reaction

acid -h alcohol = ester + water

is slightly endothermic. It is also generally slow and incomplete.

The following tables are important from a physiological point of view.

��\

�� �