Excess molar volumes of (a cycloalkane + an alkanol) at 298.15 K T. M. LETCHER AND J. MERCER-CHALMERS Department of Chemistry, Rhodes University, Grahamstown, South Africa Received December 7, 1990 T. M. LETCHER and J. MERCER-CHALMERS. Can. J. Chem. 69, 1259 (1991). In this work we report the excess molar volumes, Vi for the miscible mixtures {XC-C5HI0 + (1 - x)CH30H} and {xc-C~H~~ + (1 - x)ClHZI+ 10H) where k = 5,6, 7, 8, or 10 and 1 = 2 or 3. The VE results are discussed in terms of the size of the cycloalkane ring and the type of alcohol. Key words: Excess volumes, cycloalkane + alkanol. T. M. LETCHER et J. MERCER-CHALMERS. Can. J. Chem. 69, 1259 (1991). On a determine les volumes molaires en excks, v:, pour des melanges miscibles de {xc-C5Hlo + (1 - x)CH30H} et de {xc-CkHZk + (1 - x)CIHZI+ IOH}dans lesquels k = 5, 6, 7, 8 ou 10 et 1 = 2 ou 3. On discute des valeurs de V: obtenues en fonction de la grandeur du cycloalcane et du type d'alcool. Mots clis : volumes en excks; cycloalcane + alcool. Introduction tube density meter, thermostated at 298.15 * 0.002 K. The method The excess molar volume, V : was measured as a function of has been described (8). mole fraction x at 298.15 K and one atmospheric pressure for Results the mixtures {XC-C5H10 + (1 - x)CH30H) and { x c - C ~ H ~ ~ + (1 - X)C[H~~+ ,OH) where k = 5,6,7,8, or 10 and 1 = 2 or 3. The v,!$ results have been deposited with the National The mixtures defined by k = 6, 7, 8, or 10 with 1 = 1 are not Research Council of Canada1 and the Redlish Kister equation: included as they are nit miscible over the whole composition [l] v,!$ = x(1 - ~)2,,=~A,(1 - 2x)' range. Of the sixteen data sets presented in this work four have been reported (1 -4). has been fitted to the results. The coefficients A, are given in Table 1, together with the standard deviation a calculated from Experimental a = vC(~m,exp - Vm,calc)*/(n - np) The cycloalkanes were purified as previously described (5). The alkanols were dried as before (6, 7) and in all cases the water impurity where n is the number and n~ the number of (by Karl Fischer titration) was found to be less than 2 x mole parameters. fraction. The cycloalkanes and the alkanols were analysed by g.1.c. Discussion and in all cases the purity was found to be better than 99.8 mol%. The V: values were calculated from molar masses and densities of Our V : results for (cyclopentane + ethanol) and (cycle- pure liquids and mixtures using an Anton-Paar DMA 601 vibrating- hexane + ethanol) are within 0.005 cm3 mol-' of the results TABLE 1. Coefficients A, for eq. [ l ] for xCnHzk + (I - x)C,,H~~+ at 298.15 K together with the standard deviation a 103~ Mixture Ao AI A2 A3 cm3 mol-' 'Copies of the results may be purchased from the Depository of Unpublished Data, Document Delivery, ClSTI, National Research Council of Canada, Ottawa, Ont., Canada KIA OS2. Can. J. Chem. Downloaded from www.nrcresearchpress.com by 194.141.252.102 on 05/28/13 For personal use only.