Rate Constants for the Formation and Aquation of cis- and trans-CrCl₂⁺

Abstract

The pseudo first order rate constants for the reactions trans-CrClz+ = CrClf2 + C1-(1) and cis-CrCl%+ = CrC1+2 + C1-(2) mere determined at 25.0' in 1.0 M hydrochloric acid solutions and found t o be 8.23 X 10-5 sec.-l and 4.25 X set.-', respectively.Extinction coefficients for tmns-CrCI?+, cis-CrClp4, and CrC1+2 in 1 M hydrochloric acid were determined at 450 and 635 mp. In the presence of C r f 2 reaction 2 was observed to be very fast.The activation energy for reaction 1 is 26.5 kcal./mole

Diffusion Coefficients of Chromium Chloride in Aqueous Solutions at 298.15 K and 303.15 K

“…As far as the authors know, no data on mutual diffusion coefficients of Cr(III) salts have been published . In this study, mutual diffusion coefficients, D , (interdiffusion coefficients) are reported for aqueous solutions of chromium(III) chloride determined in the concentration range from (0.005 to 0.05) mol·dm -3 using an open-ended conductometric capillary cell. − These results are discussed on the basis of the Onsager−Fuoss model. − We are aware that, under the conditions used in this study, various complexed − and hydrolyzed chromium(III) species may be present. No attempt is made at this stage to separate individual contributions to the mutual diffusion, since what is required in practical applications, such as the chemistry of the oral cavity, is knowledge on the global behavior.…”

“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] These results are discussed on the basis of the Onsager-Fuoss model. [28][29][30][31] We are aware that, under the conditions used in this study, various complexed [32][33][34] and hydrolyzed 35 chromium(III) species may be present. No attempt is made at this stage to separate individual contributions to the mutual diffusion, since what is required in practical applications, such as the chemistry of the oral cavity, is knowledge on the global behavior.…”