Thermal properties of aqueous uni-univalent electrolytes

Thermodynamic Properties of Aqueous Sodium Chloride Solutions

“…Of the data listed in Table 1, two sets represent compilations of a large number of older measurements: the osmotic coefficients of Robinson and Stokes [28] and the apparent enthalpies of Parker [29]. These two sets were weighted more heavily in least-squares calculations to reflect the fact that they are compilations based on many measurements of relatively high accuracy.…”

“…Below 100°C we rely upon the apparent molal enthalpies evaluated by Parker [29] as heat capacities; we have converted their "calibration factors" t.P/P 0 (corr) (in their notation) to apparent molal heat capacities using the known properties of water [22]. These heat capacities appear in Table 2.…”

Enthalpies of solution of Kbr, Ki, Kio3, and Kio4 in H2o

“…E is the mean of th e elec tri cal energy equivale nts for the initial and fin al systems expressed as joules (te mperature unitt t ; !1R /R (I" is the ratio of the increme nt in th e thermi stor resistance to the average resistance (thi s value is proporti onal to !1T) and is ex pressed in te mpera ture units; Q is th e measured heat of th e solution reacti on and Q = E(!1R /R fI.,,); Q (l 1Il1' is the e nergy for breaking the ampoules plus a va porizati on correcti on for th e a ir space in ea ch ampoule; a nd !1H ". (T ) is th e enthalpy of solution at th e concentrati on , m , and at the mean te mperature of reaction , T. Q T is the correction to T = 298.1 5 K, 1>1° is th e correcti on to infinite dilution [1] , and !1Ho (00, 298. 15 K) is the e nthalpy of soluti on at infinite diluti on at th e standard te mperature of reacti on.…”

“…Crouthamel ~' ayes, and Martin [33] have re po rted tlH ,5.6 kJ) from 0 °C to 70°C fo r th e reacti.on 10.9 kcal (or (4) lfrom their work, Parker [34] de ri ved the followi ng equation ime nts given in tabl e 6 was multiplied by 45600 l mol-1 we obtained the cO ITections, Q '" whi c h we re added to tlH(T). Walden , 1907 [20] W ust and Lange, 1925 [21] Popov, Bunde1, a nd Cho11er, 1930 [22] Chipman, Johnson a nd Maass, 1929 [23] Fedorov and Si1 ' chenko, 1937 [24 ] Lange and Martin, 1937 [25] Popov, Skuratov, and Stre1'tsova, 1940 [26] Hi eta la, 1960, [27] Parker's "Best " valu e , 1965 [1] Krestov and Abrosimov, 1967 [2] Tsvetkov and Rabi novich, 1969 [3] Jo1y, Thourey, and P~rachon, 1973 [5] 01ofsson, 1977 [6] This work (USSR) Tsvetkov and Rabinovich, 1969 [2] Jo1y , Thourney and Perachon, 1973 [5] Thi s work (USSR)…”

Testing of the NBS clinical microcalorimeter

“…Corrections for heats of dilution to the standard state [12] were applied using tabulated data [8] for the relative apparent molal enthalpy and heat capacity of the reactants and products. Also a correction was applied [8] to convert the data to 25°C. The final value, AU°, is the internal energy change of ionization of water at 25°C .…”