Bunsen coefficients Table

The narcotic potency and solubiUty in oHve oil of several metabohcaHy inert gases are Hsted in Table 10. The narcotic potency, ED q, is expressed as the partial pressure of the gas in breathing mixtures requited to produce a certain degree of anesthesia in 50% of the test animals. The solubiUties are expressed as Bunsen coefficients, the volume of atmospheric pressure gas dissolved by an equal volume of Hquid. The Hpid solubiHty of xenon is about the same as that of nitrous oxide, a commonly used light anesthetic, and its narcotic potency is also about the same. As an anesthetic, xenon has the virtues of reasonable potency, nonflammability, chemical inertness, and easy elimination by the body, but its scarcity and great cost preclude its wide use for this purpose (see Anesthetics). 

TABLE 22. BUNSEN COEFFICIENTS (P) OF GASES AT latm IN ORGANIC SOLVENTS AT 20 C ... 

There are other ways of accounting for the effect of water salinity. Ray F. Weiss proposed to use for the sea water directly the empiric equation (2.291), whose constants are presented in Table 2.30. And lastly, the Z. Duans group, combining the Pitzer equation (2.292) and equations of real gas solution state, calculated Bunsen coefficients for O, N, CH, H S and CO in conditions of temperature between 0 and 200-300 °C, pressure of 1 to 200-2,000 bar with NaCl content of 0 to 6 mole-kg" (Duan et at, 2006 Duan et al, 2007 Mao and Duan, 2006 Geng and Duan, 2010). However, their values are noticeably different from experimentally derived under high temperature. 

To interpret absorption experiments for this system it is essential to know the way in which the saturation solubility varies with temperature. This is experimentally impossible since the dissolution is always accompanied by reaction at normal temperatures. For chlorine-toluene an estimate has been made from solubility measurements performed in the range O C to - 20 C (5) which are presented in Fig. 2, along with some companion measurements using the same gas burette technique with the non-reactive system chlorine-carbon tetrachloride. The Cl - CCli results compare well with those published in Intern ional Critical Tables (6) which verifies the measurement technique. The extrapolation of the Cl - CgH CH solubilities into the ambient temperature range shows that the data are not seriously different from the idealised solubility based on an application of Raoults Law, and the slope of the log solubility versus reciprocal absolute temperature indicates a heat of solution of 5,500 cal mol". This estimated solubility data is presented also in Fig. 3 as a Bunsen coefficient as the solubility expressed in volumes of gas dissolved per unit volume of solvent toluene. The Bunsen coefficient of 70 at 25u is a moderate solubility, though very much less than a value of around 440 for amnonia-water at the same temperature. 

Table 33. Solubility Data for Ethene Expressed as "mole/liter and as the Bunsen Coefficient...

In this study, the solubilities of carbon dioxide were represented by the Bunsen absorption coefficients and their values given in Table I for lithium chloride and in Table II for calcium chloride. The densities of salt solutions are... 

Partial pressure of a gas component in water under the same conditions may be determined using Henry or Bunsen solubility coefficients identified for partial pressures of 1 bar. If the value of Henry solubility coefficient is available, partial pressure of a component i is calculated from equation (2.280). Values of Henry solubility coefficients may be found in reference literature (Table 2.27). However, these values are applicable only... 

Bunsen solubility coefficients for distilled water under normal or standard conditions are often called simply solubility. Their values for most common gas components are listed in Table 2.28. 

Table 2.30 Ray Weiss equations constants (2.291) for the determination of Bunsen solubility coefficient, ml-1 atm... 

Contents of the gas components is determined as the product of volume fraction of each of them and the value of the gas/water ration (line 2). Bunsen solubility coefficients (hne 3) and Sechenov coefficients (line 4) for temperature 40 °C may be taken from Tables 2.28 and 2.29. Corrections of Bunsen solubihty coefficients for the salinity (m =118/58 =2.03 mole-1" 0 are calculated from equation (2.306) (line 5). Partial pressure of each component is equal to the ratio of its concentration and the value of corrected Bunsen solubility coefficient (hne 6). 

As well as Henry s constant // , a measure of the capacity of a liquid to dissolve a gas, are the Bunsen absorption coefficient Obu, and the Oswald absorption coefficient Oqsj, which can be found in tables. The Bunsen absorption coefficient is... 

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