Equilibrium in the system: lead acetate, lead oxide and water, at 25° . l difficulties areresponsible for the fact that its composition has not previouslybeen correctly ascertained. To establish the formula of this com-pound six Hues were determined. These gave rise to a largenumber of intersections, of which 10 were at sufficiently large angleto be considered representative of the solid phase. The mean ofthese 10 was the accepted value. Calculated for 3Pb(C2H302) 2 . PbO . 3 H2OPb(C2H302)2 H2O Calculated Found The apparent precision of the accepted value is somewhatdeceptive
Equilibrium in the system: lead acetate, lead oxide and water, at 25° . l difficulties areresponsible for the fact that its composition has not previouslybeen correctly ascertained. To establish the formula of this com-pound six Hues were determined. These gave rise to a largenumber of intersections, of which 10 were at sufficiently large angleto be considered representative of the solid phase. The mean ofthese 10 was the accepted value. Calculated for 3Pb(C2H302) 2 . PbO . 3 H2OPb(C2H302)2 H2O Calculated Found The apparent precision of the accepted value is somewhatdeceptive, as the individual determinations are slightly scattering. The tri-lead-dioxy-diacetate Pb (0211302)2 • 2 PbO . 4 H2O has beenisolated previously and its formula, with respect to the two solidcomponents, correctly ascertained. It has been hitherto describedas an amorphous solid, and in fact, as it usually occiuS it has thatappearance. Nevertheless, by slow evaporation of its clear solu- 1 For nomenclature, see Hoflfman, Dictionary of Inorganic Compounds, 1, p. Fig. I.—Isothermal equilibrium at 25° The curves AB, BC, CD, and DE represent the composition of the solution in equilibrium with the respec-tive solid phases. The area ABCDE encloses the region of unsaturated solutions. Note the great increaseof solubility of the neutral acetate in basic solutions, the high solubility and limited range of stability of themonoxy acetate, and the very great range of stability of the dioxy acetate. The data are computed withrespect to weight per centequ113313451915232232jack
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