. Carnegie Institution of Washington publication. IN THE PRESENCE OF STRONGLY HYDRATED SALTS. 57 Strong,1 and Guy and Jones,2 when the absorption of salts as affected by the water present was studied. It was found that rise in temperature and increase in the concentration of the solution both tended to shift the ab- sorption of the salt towards the longer wave-lengths. The effect of rise in temperature and the increase in the concentration of the solution tended to simplify the hydrates in combination with the particles of the salt. The resonator within this simplified system seems to vibrate
. Carnegie Institution of Washington publication. IN THE PRESENCE OF STRONGLY HYDRATED SALTS. 57 Strong,1 and Guy and Jones,2 when the absorption of salts as affected by the water present was studied. It was found that rise in temperature and increase in the concentration of the solution both tended to shift the ab- sorption of the salt towards the longer wave-lengths. The effect of rise in temperature and the increase in the concentration of the solution tended to simplify the hydrates in combination with the particles of the salt. The resonator within this simplified system seems to vibrate so as to shift the absorption bands towards the red. The effect of the salt on the absorption of the water is the same as that of rise of temperature and increase of concentration on the absorption of the dissolved substance. We would naturally look for a similar explanation of the two sets of phenomena. It has been suggested by Dr. Guy, that the effect of the salt on the absorption of light by water may be due to the breaking down of the associated molecules of water by the dissolved sub- stance. This would be in keeping with the fact established by Jones and Murray,3 that one associated substance when dissolved in another associated substance diminishes its association. In terms of this explanation, however, it is a little difficult to see why non- hydrated salts, such as were used in this work, do not also diminish the asso- ciation of water and cause a shifting of its absorption bands towards the longer wave-lengths. It may be that the effect of the dissolved substance in breaking down the association of the water is pronounced only in the case of water of hydration or the water that is combined with the dissolved sub- stance, and that the explanation offered above is fundamentally correct. 70- 60-- 50- 40- 30 20 10. CaCI2, Depth 1cm. 12 1 Cam. Inst. Wash. Pubs. 130 and 160. 3 Amer. Chem. Journ., 30, 193 (1903). 2 Amcr. Chem. Journ., 49, 1 (1913).. Ple
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