Abstract
the second with that of Ca. That this was a reasonable assump tion is further suggested by the solubility product constants for the hydroxides of Mg and Ca, which are 1.2 X 10h1 and 4.! X Io@, respectively (Johnston, †? is).To obtain more exact in formation concerning this behavior of Mg and Ca, the following experiments were run on sea water taken from the English Chan nel outside the Plymouth breakwater, and from Great Harbor, Woods Hole, Mass. Graded amounts of 10 normal NaOH (practically carbonate free 2) were added to 100 c.c portions of sea water. The flasks were stoppered and the contents thoroughly mixed. The supernatant fluid was filtered off as soon as the precipitate had settled somewhat (within four hours in all cases), and Ca and Mg were determined in separate samples of the filtrate. Ca was precipitated as oxalate from 25 cc. samples according to McCrud den's (†09)method, and allowed to stand in the refrigerator for at least i8 hours. The oxalate, after washing, was determined with permanganate. The Mg determinations were carried out according to the method of Willstatter and Waldschmidt-Leitz
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