Calculation of the Solubility of a Mixture of Hydrogen and Nitrogen in Water at 25° in the Pressure Range of 50 to 1000 Atmospheres

Abstract

On evaporating on a steam-bath with concentrated hydrochloric acid and making alkaline with ammonia, this compound gave 2-anilino-4-oxy-5-methoxypyrimidine, m. p. 254-255°from alcohol. This same compound was obtained for comparison by heating 2-ethylmercapto-4-oxy-5-methylpyrimidine with aniline on a steam-bath until all the ethylmercaptan was evolved. Benzene was added and the solid removed by filtering. This was recrystallized from alcohol, m. p. 254-255°.

Isopiestic determination of the osmotic and activity coefficients ofZnSO4(aq) atT= 298.15 K, and the standard potential of the electrochemical cell ZnHgx(two phase)| ZnSO4(aq)| PbSO4(s)| PbHgx(two phase)

“…(18,19) We chose ZnSO 4 (aq) rather than CdSO 4 (aq) for a detailed examination, since it is less hazardous to work with. There are several determinations of the e.m.f.s of cell (V-ii) at T = 298.15 K. (18)(19)(20)(21)(22) The extensive sets of e.m.f.s of Bray (20) and of Rasaiah (18,19) are quite consistent with each other, but the low molality results of Cowperthwaite and La Mer (21) are somewhat discrepant, as previously noted by Rasaiah. (18,19) A similar comparison by us of the osmotic coefficients of ZnSO 4 (aq) derived from direct vapor pressure (23) and isopiestic measurements (24)(25)(26)(27)(28) indicates significant discrepancies between some of these studies.…”

“…Third, Kielland (22) reported e.m.f.s at four molalities from m = 5.12 · 10 −2 mol · kg −1 to m = 1.501 mol · kg −1 and these results appear to be consistent with those of Cowperthwaite and LaMer (21) at 5 · 10 −2 mol · kg −1 , but the measurements of these two studies do not quite overlap in molality. At m = (0.150 and 0.510) mol · kg −1 the e.m.f.s of Kielland are about 4 · 10 −4 V to 6 · 10 −4 V below those of Bray and of Rasaiah, whereas at 1.501 mol · kg −1 all three sets agree.…”

“…studies available for cell (V-ii) at T = 298.15 K. (18,(20)(21)(22) The lower molality results of Bray (20) and Cowperthwaite and LaMer (21) are discrepant from each other by up to 1 mV. Kielland (22) suggested that the results of Cowperthwaite and LaMer were more reliable. However, the very extensive e.m.f.…”

“…measurements useful for determining a(ZnSO 4 ) are those for cell (V-ii), (18)(19)(20)(21)(22) but those for the related cell with a Hg 2 SO 4 (cr)|Hg(l) electrode (45,46) shall also be compared. A preliminary graphical assessment was made of the consistency and precision of the various sets of e.m.f.s by using deviation functions.…”

“…studies using cell (V-ii) (18,(20)(21)(22) were compared without making the corrections to the e.m.f.s for dissolution of PbSO 4 (cr) into the ZnSO 4 (aq) solutions, because this dissolution should affect all of the sets of e.m.f.s equally at any particular molality. However, the e.m.f.s of Masaki and Ikkatai, (45) and of Herrera et al (46) were determined with a slightly different cell using a Hg 2 SO 4 (cr)|Hg(l) electrode, for which the corrections to the e.m.f.…”