. American chemical journal . y found. ;■ In the case of cadmium iodide there is marked disagree- ment^between the observed and calculated values of R^ but IVO \r---- %\ •••k Ri W\ ~\ ^, trs /Y,i„. ^^ nf ^ c» \^\ \ ^ ivtf ^no \ ^N. D mif/v^^cci ««-« V 10 20 JO 40 50 60 70 so 90 P Fig. III. we do not feel warranted in drawing any conclusions fromthis until the measurements have been repeated. As has already been pointed out by Andrews,^ there is asingular break in the refractive index-concentration curve »Loc. cU. 482 Getman and Wilson. for ethyl alcohol. This is also app
. American chemical journal . y found. ;■ In the case of cadmium iodide there is marked disagree- ment^between the observed and calculated values of R^ but IVO \r---- %\ •••k Ri W\ ~\ ^, trs /Y,i„. ^^ nf ^ c» \^\ \ ^ ivtf ^no \ ^N. D mif/v^^cci ««-« V 10 20 JO 40 50 60 70 so 90 P Fig. III. we do not feel warranted in drawing any conclusions fromthis until the measurements have been repeated. As has already been pointed out by Andrews,^ there is asingular break in the refractive index-concentration curve »Loc. cU. 482 Getman and Wilson. for ethyl alcohol. This is also apparent in the specific refrac-tion-concentration diagram. As Andrews has indicated, thisbreak occurs at a concentration corresponding to the In the tables the average value of R^ has been tabulatedfor all of the anhydrous solutes studied, this average value be- IVR r/n aic/. »/^_ /K/V Of/ 50 P Fig. IV. 70 80 ing in good agreement with that calculated from the^refrac-tive equivalents of the constituent elements. In the case ofethyl alcohol this average value was obtained by excludingthe four values which lie on the parallel dotted line shownin Fig. II., since this evidently does not refer to anhydrousalcohol. Refractive Indices of Some Solutions. 483 In Table XXX. is given the value of the specific refractionas calculated from refractive equivalents for the anhydroussolute (A^), for the hydrated solute (R^), and also the experi-mentally determined value (R). In the fifth column thedifference between the calculated and determined value is recorded. Table XXX. Solute. Ra (calc). ^/ ^(calc). R (found). Diff. NaCl 0 •2303 + NaNOg + Na^ 0 .2692 + KCl + KBr + KI — KNO3
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