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  • MES  (1)
  • hydrochloric acid  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The system HCl+InCl3+H2O from 5 to 55°C: Application of Harned's rule (1996)
    Springer
    Journal of solution chemistry 25 (1996), S. 1241-1259 
    Details
    ISSN: 1572-8927
    Keywords: Activity coefficient ; emf ; Harned's equations ; hydrochloric acid ; indium chloride ; mixtures of electrolytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Electromotive-force measurements of cells containing hydrochloric acid and indium chloride have been made to determine the variation of the log of the activity coefficient of hydrochloric acid with change in the amount of indium chloride in the solution. The simpler Harned equations have been used to fit the data. The quadratic terms in the Harned equations for the activity coefficients of HCl in the salt mixtures are required for a good fit of the 968 experimental emf data points at all the experimental ionic strengths and temperatures. The more convenient Pitzer ion-interaction treatment of the data will be reported in a separate publication which will include the values of the Pitzer parameters for pure InCl3(aq), and mixing parameters for H+−In+3 and H+−In+3−Cl−. A comprehensive investigation on the mixed electrolyte solutions at 11 different constant total ionic strengths ranging from 0.05 to 3.5 mol-kg−1 was made at 11 temperatures from 5 to 55°C using the cell without liquid junction of the type: Pt,H2(g, 1 atm)|HCl(m A)+InCl3(m B)+H2O|AgCl,AG (A).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00972649
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  • 2
    Electronic Resource
    Electronic Resource
    Second Dissociation Constant of Two Substituted Aminomethanesulfonic Acids in Water from 5 to 55°C (1997)
    Springer
    Journal of solution chemistry 26 (1997), S. 1209-1216 
    Details
    ISSN: 1572-8927
    Keywords: MES ; TES ; emf ; standard potential ; zwitterion ; buffer solution ; activity coefficients ; dissociation constants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The equilibrium constants for the dissociation steps of (4-morpholineethanesulfonic acid) (MES) and (2-{[tris(hydroxymethyl)methyl]-1-ethanesulfonic acid (TES) have been determined at 12 and 7 different temperatures, respectively, from 5 to 55°C. The emf measurements were carried out by using a cell without liquid junction of the type: Pt; H2 (g, 1 atm) | buffer(m1), Na salt of buffer(m2), NaCl(m3) | AgCl, Ag. The pK 2 values of MES and TES at 25°C are 6.269 and 7.550. The thermodynamic quantities for the dissociation process have been calculated. These zwitterionic compounds are useful for pH control as standard buffers in the physiological region of pH 5.50 to 6.50 for MES, 6.5 to 7.5 for TES, respectively. Reliable measurements of the pH at isotonic saline solution (I = 0.16m) such as blood and plasma are important for clinical diagnosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022937324983
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