58 



II. 



CHEMISTRY OF FATTY ACIDS AND GLYCEROL 



Table 20. Solubilities of Fatty Acids in Water" 



No. of Grams acid per 100 grams water at 



carbon 



Name of acid atoms 0.0° 20.0° 30.0° 45.0° 60.0°C. 



Caproic 6 0.864 0.968 1.019 1.095 1.171 



Heptanoic 7 0.190 0.244 0.271 0.311 0.353 



Caprylic 8 0.044 0.068 0.079 0.095 0.113 



Nonanoic 9 0.014 0.026 0.032 0.041 0.051 



Capric 10 0,0095 0.015 0.018 0.023 0.027 



Undecanoic 11 0.0063 0.0093 0.011 0.013 0.015 



Laurie 12 0.0037 0.0055 0.0063 0.0075 0.0087 



Tridecanoic 13 . 0021 . 0033 . 0038 . 0044 . 0054 



Myristic 14 0.0013 0.0020 0.0024 0.0029 0.0034 



Pentadecanoic 15 0.00076 0.0012 0.0014 0.0017 0.0020 



Palmitic 16 0.00046 0.00072 0.00083 0.0010 0.0012 



Margaric 17 0.00028 0.00042 0.00055 0.00069 0.00081 



Stearic 18 0.00018 0.00029 0.00034 0.00042 0.00050 



<• A. W. Ralston and C. W. Hoerr, /. Org. Chem., 7, 546-555 (1942), p. 547. 



Table 21. Approximate Solubility of Water in Saturated Fatty Acids 

 AT Several Temperatures" 



Per cent of water dissolved in fatty acids at temperatures (°C.) given 

 Fatty acid in parentheses 



Caproic 2.21 4.73 7.57 9.70 _ _ _ _ 



(-5.4) (12.3) (31.7) (46.3) 



Heptanoic 2.98 — — 9.98'' _ _ — — 



(-8.3) (42.5) 



Caprylic — 3.88 — _____ 



(14.4) 



Pelargonic — 3.45 — — — — — — 



(10.5) 



Capric — — 3.12 — — — — — 



(29.4) 



Undecanoic — — 2.72 — 4.21 _ _ — 



(26.8) (57.5) 



Laurie _ _ _ 2.35 — — 2.70 2 85 



(42.5) (75.0) (90.5) 



Tridecanoic _ _ _ 2.00 _ _ _ _ 



(40.8) 



Myristic — — — — 1.70— — — 



(53.2) 



Pentadecanoic — — — — 1.46 — — 1.62 



(51.8) (90.0) 



Palmitic — — — — — 1.25— — 



(61.8) 



Margaric — — — — — 1.06 — — 



(60.4) 



Stearic _____ o.92 — 1.02 



(68.7) (92.4) 



" Adapted from C. W. Hoerr, W. O. Pool, and A. W. Ralston, Oil & Soap, 19, 126-128 i 

 (1942). ^ I 



'' Value reported erroneously" later corrected in A. W. Ralston, Fatly Acids arid Their * 

 Derivatives, Wiley, New York, 1948. 



