HEAT-CAPACITIES AND DENSITIES OF MIXTURES OF VERY POLAR SUBSTANCES .3. MIXTURES CONTAINING EITHER TRICHLOROMETHANE OR 1,4-DIOXANE OR DIISOPROPYLETHER

Excess molar heat capacities C(p)E at constant pressure and excess molar volumes V(E) have been determined, as a function of mole fraction x1 at 25-degrees-C and atmospheric pressure, for 10 binary liquid mixtures containing either trichloromethane (series I) with C6H5CH3, or C6H5Cl, or C5H5N, or CH3COCH3, or C6H5NO2; 1,4-dioxane (series II) with (C2H5)3N, or (CH3)2CHOCH(CH3)2, or (CH3)2SO}; or diisopropyl ether (di-1-methylethyl ether) (series III) with (C2H5)3N, or CHCl3. The dipole moments p (10(-30)C-m) of the substances range from nearly 0 to 14.1 for nitrobenzene. The C(p)E of series I and III are all positive, with C(p)E(x1 = 0.5) (J-K-1-mol-1) ranging from 1.04 for {x1CHCl3 + x2C6H5Cl) to 16.66 for {X1(CH3)2CHOCH(CH3)2 + X2CHCl3}. In series II, the Cp(E) are positive and small for [x(1)1,4-C4H8O2 + X2(CH3)2CHOCH(CH3)2), S-shaped and small for {x(1)1,4 -C4H8O2 + X2(C2H5)3N}, and negative and small for {x1(1),4 -C4H3O2 + X2(CH3)2SO) . The exceSS volumeS are small and positive for {x1CHCl3 + x2C6H5CH3), S-shaped for (x1CHCl3 + x2CH3COCH3), {x1(1),4 - C4H8O2 + X2(C2H5)3N) and [x1(CH3)2CHOCH(CH3)2 + X2(C2H5)3N}, and negative for the other systems.