Excess and apparent molar volumes of mixtures of water and acetonitrile between 0 and 25°C

The (water+acetonitrile) mixture revisited: A new approach for calculating partial molar volumes

“…15 reported in table 1 where indexes 1 and 2 refer, respectively, to water and AN. As shown in figure 1(a) the results obtained at 298.15 K agree very well with previously published data [3,8].…”

“…In fact, and as seen from table 2, the literature data reported by several authors at 298.15 K [1][2][3][4][5][6][7][8][9] show differences that fall beyond the range of experimental error. These discrepancies are due, in our opinion, to the fact that it is very difficult to completely eliminate water from AN.…”

“…In the case of (water + AN) mixtures previous works [3,8] indicate the existence of a minimum in the curve describing the dependence on composition of partial molar volume of water. However, for data obtained at 298.15 K, this minimum is placed at different compositions, x 2 = 0.75 in the case of reference [3] and x 2 = 0.82 in reference [8].…”

“…A review of the literature shows that density of the (water + AN) system has been measured by several authors [1][2][3][4][5][6][7][8][9]. However, reported data for mixtures with very low water content show differences that are well beyond experimental error and values for derived quantities, such as partial molar volumes and thermal expansion coefficients calculated by different authors are not in good agreement.…”

Determination of three physical properties of quinoline ionic liquids with hexafluorophosphate

“…First of all, the pycnometer was calibrated with acetonitrile to obtain the exact volume, and the density of acetonitrile was referenced from the literatures [15,16]. During the experiment, the temperature was maintained within ± 0.05 K in a thermostatic water-circulator bath; the density of ILs was measured at atmospheric pressure from 283.15 K to 333.15 K; the temperature was kept constant at each point for 30 minutes.…”