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The solubility of sodium and potassium soaps and the phase diagrams of aqueous potassium soaps
Author(s) -
McBain James W.,
Sierichs William C.
Publication year - 1948
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02645899
Subject(s) - potassium , solubility , sodium , chemistry , salt (chemistry) , alkali metal , aqueous solution , inorganic chemistry , hydrolysis , phase (matter) , nuclear chemistry , organic chemistry
Summary Solubility data are provided and collected for the pure sodium and potassium soaps. Hydrolysis obscures the temperatures of solution but is obviated by the presence of a small excess of alkali. Each sodium soap has a large range of temperature between fair and high solubility, whereas the potassium soaps go abruptly into solution, at almost the same temperature and concentration of each soap. The only soaps that are even moderately soluble at room temperature are potassium laurate, myristate, and oleate, the potassium salt of acids from coconut oil, and the sodium oleate. The other sodium and potassium soaps of the saturated fatty acids require elevated temperatures for solution. Phase diagrams for the five commonest potassium soaps are developed and recorded.