Apparent molar volumes and apparent molar heat capacities of aqueous potassium hydrogen phthalate (KHP) and potassium sodium phthalate (KNaP) at temperatures fromT= 278.15 K toT= 393.15 K at the pressure 0.35 MPa

Ford, T.D.; Call, T.G.; Origlia, M.L.; Stark, M.A.; Woolley, Earl M.

doi:10.1006/jcht.2000.0742

Cited by 13 publications

(2 citation statements)

References 13 publications

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“…HSer AE (aq) = H þ (aq) + Ser À (aq) ð19bÞ C p;/ ðobsÞ $ ð1 À aÞ Á C p;/ ðNa þ Ser À Þ þ a Á C p;/ ðHSer AE Þþ a Á C p;/ ðNa þ OH À Þ þ C p;/ ðrelaxÞ: ð20Þ Figure 26 shows the fractional contributions for apparent molar heat capacities {C p,/ (i)/C p,/ (obs)} of the various terms in equation (17) for aqueous solutions of equimolal (serine + HCl) calculated using equations (14) to (18) and figure 27 shows the fractional contributions of the various terms in equation (20) for aqueous solutions of equimolal (serine + NaOH) calculated using equations (14), (16), and (18) to (20). These two figures illustrate the importance of accounting for changes in the equilibrium distribution of species as the there are changes in T and stoichiometric molality m. This is particularly important at low m, especially as one extrapolates to m = 0 mol AE kg À1 to determine standard state values.…”

Section: Figures 21 To 23mentioning

confidence: 99%

A new tool for an old job: Using fixed cell scanning calorimetry to investigate dilute aqueous solutions

Woolley

2007

The Journal of Chemical Thermodynamics

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Section: Figures 21 To 23mentioning

confidence: 99%

A new tool for an old job: Using fixed cell scanning calorimetry to investigate dilute aqueous solutions

Woolley

2007

The Journal of Chemical Thermodynamics

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“…In addition to the references listed in Table 2, another paper (Ford et al 2001) gives data from which the molar enthalpy change for ionization of HP − can be calculated. However, because the values are at 3.5 bar instead of atmospheric pressure, we decided not to use these values in the present paper.…”

Section: Literature Values Of Relevant Quantities and Derived Quantitiesmentioning

confidence: 99%

Reaction of KHP with excess NaOH or TRIS as standard reactions for calibration of titration calorimeters from 0 to 60 °C

Kenealey,

Bastos,

Assaf

et al. 2024

Eur Biophys J

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Calibration of titration calorimeters is an ongoing problem, particularly with calorimeters with reaction vessel volumes < 10 mL in which an electrical calibration heater is positioned outside the calorimetric vessel. Consequently, a chemical reaction with a known enthalpy change must be used to accurately calibrate these calorimeters. This work proposes the use of standard solutions of potassium acid phthalate (KHP) titrated into solutions of excess sodium hydroxide (NaOH) or excess tris(hydroxymethyl)aminomethane (TRIS) as standard reactions to determine the collective accuracy of the relevant variables in a determination of the molar enthalpy change for a reaction. KHP is readily available in high purity, weighable for easy preparation of solutions with accurately known concentrations, stable in solution, not compromised by side reactions with common contaminants such as atmospheric CO2, and non-corrosive to materials used in calorimeter construction. Molar enthalpy changes for these reactions were calculated from 0 to 60 °C from reliable literature data for the pKa of KHP, the molar enthalpy change for protonation of TRIS, and the molar enthalpy change for ionization of water. The feasibility of using these reactions as enthalpic standards was tested in several calorimeters; a 50 mL CSC 4300, a 185 μL NanoITC, a 1.4 mL VP-ITC, and a TAM III with 1 mL reaction vessels. The results from the 50 mL CSC 4300, which was accurately calibrated with an electric heater, verified the accuracy of the calculated standard values for the molar enthalpy changes of the proposed reactions.

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Thermodynamics of proton dissociations from aqueous glycine at temperatures from 278.15 to 393.15 K, molalities from 0 to 1.0 mol·kg−1, and at the pressure 0.35 MPa: Apparent molar heat capacities and apparent molar volumes of glycine, glycinium chloride, and sodium glycinate

Ziemer

Niederhauser

Merkley

et al. 2006

The Journal of Chemical Thermodynamics

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Apparent molar volumes and apparent molar heat capacities of aqueous potassium hydrogen phthalate (KHP) and potassium sodium phthalate (KNaP) at temperatures fromT= 278.15 K toT= 393.15 K at the pressure 0.35 MPa

Cited by 13 publications

References 13 publications

A new tool for an old job: Using fixed cell scanning calorimetry to investigate dilute aqueous solutions

A new tool for an old job: Using fixed cell scanning calorimetry to investigate dilute aqueous solutions

Reaction of KHP with excess NaOH or TRIS as standard reactions for calibration of titration calorimeters from 0 to 60 °C

Thermodynamics of proton dissociations from aqueous glycine at temperatures from 278.15 to 393.15 K, molalities from 0 to 1.0 mol·kg−1, and at the pressure 0.35 MPa: Apparent molar heat capacities and apparent molar volumes of glycine, glycinium chloride, and sodium glycinate

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