not give data at 40 but at 38'; these values of K: are assumed to hold at 40'.Corrections were then applied by means of the relation x 2 / ( C -x ) = K'/KL for each value of "C" listed in Tables I and I1 and for each value of p"'.The resulting values of (C -x ) , the true [CO,-], were then related to the ionic strength by plotting l / m against GI2. Extrapolation of these curves to zero value of pl/' yielded the following values. Act. coeff. at 25' in Act. coeff. at 40° in summary 1. The solubilities at 25 and 40' of barium and strontium carbonates have been determined in pure water and in solutions of lithium, sodium and potassium chlorides. The solubilities in solutions of the alkali chlorides are presented tabularly. 2. The activity coefficients of these carbonates in the alkali chloride solutions have been calculated and recorded. 3. The average heats of solution of these carbonates into their saturated solutions have been calculated for the temperature range 25-40'. AUSTIN, TEXAS RECEIVED DECEMBER 7, 1930 [CONTRIBUTION FROM THE GATES AND CRELLIN LABORATOFSES OF No. 5801 CHEMISTRY,
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