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Thermodynamics of the Second Dissociation Constant and Standards for pH of 3-(NMorpholino) Propanesulfonic Acid (MOPS) Buffers from 5 to 55°C (1998)

Roy, Rabindra N. ; Mrad, Dawn R. ; Lord, P. A. ; [et al.]

Springer

Journal of solution chemistry 27 (1998), S. 73-87

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ISSN: 1572-8927

Keywords: Dissociation constant ; buffers ; NaMOPS ; temperature dependence ; emf ; Gibbs energy ; enthalpy ; entropy ; heat capacity ; zwitterion ; liquid junction

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The second dissociation constant pK2 of 3-(N-morpholino)propanesulfonic acid (MOPS) has been determined at eight temperatures from 5 to 55°C by measurements of the emf of cells without liquid junction, utilizing hydrogen electrodes and silver–silver chloride electrodes. The pK2 has a value of 7.18 ± 0.001 at 25°C and 7.044 ± 0.002 at 37°C. The thermodynamic quantities ΔG°, ΔH°, ΔS°, and ΔC p o have been derived from the temperature coefficients of the pK 2. This buffer at ionic strength I = 0.16 mol-kg−1 close to that of blood serum, has been recommended as a useful secondary pH standard for measurements of physiological fluids. Five buffer solutions with the following compositions were prepared: (a) equimolal mixture of MOPS (0.05 mol-kg−1) + NaMOPS, (0.05 mol-kg−1); (b( MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1) + NaCl (0.05 mol-kg−1); (c) MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1); + NaCl (0.11mol-kg−1); (d) MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1); and (e)MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1) + NaCl (0.08 mol-kg−1).The pH values obtained by using the pH meter + glass electrode assembly are compared with those measured from a flow–junction calomel cell saturated with KCl (cell B), as well as those obtained from cell (A) without liquid junction at 25 and 37°C. The conventional values of the liquid junction potentials E j have been obtained at 25 and 37°C for the physiological phosphate reference solution as well as for the MOPS buffers (d) and (e) mentioned above.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1022692629289

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Die Schwingungsspektren der Methyl- und Phenylchlorphosphine (1965)

Goubeau, J. ; Baumgärtner, R. ; Koch, W. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für anorganische Chemie 337 (1965), S. 174-182

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ISSN: 0044-2313

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Description / Table of Contents: The vibrational spectra of PCl(CH3)2, PCl2CH3, PCl(C6H5)2 and PCl2C6H5 are reported and discussed. For the methyl compounds the force constants are calculated.

Notes: Es werden die Schwingungsspektren von PCl(CH3)2, PCl2CH3, PCl(C6H5)2 und PCl2C6H5 mitgeteilt, mit den Spektren von PCl3, P(CH3)3 und P(C6H5)3 verglichen und den Grundschwingungen zugeordnet. Für die Methylverbindungen werden die Kraftkonstanten berechnet und die Bindungsverhältnisse diskutiert. Darstellung und Eigenschaften der Methylverbindungen werden beschrieben.

Additional Material: 5 Tab.