Acoustic absorption in aqueous potassium phosphate |
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Authors: | L Madsen L J Slutsky R D White J Harkness |
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Institution: | (1) Department of Chemistry, University of Washington, 98195 Seattle, WA;(2) Department of Chemistry, University of Idaho, 83843 Moscow, ID |
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Abstract: | Measurements of acoustic absorption and velocity as a function of frequency and concentration in KH2PO4–K2HPO4 buffers at 4°C and pH 5-7 are reported. The dependence of the observed acoustic relaxation parameters on concentration is consistent with that to be expected from perturbation of a monomer-dimer equilibrium with an equilibrium constant for 2H2PO
4
–
(H2PO4)2
2–] of 0.21 M–1, a bimolecular rate constant of 5×108 M–1-sec–1 and a standard volume change of –5 cm3 mole. The equilibrium constant for H2PO
4
–
+ HPO4
2–H3(PO4)2
3– is estimated to be 0.7 M–1. |
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Keywords: | Ultrasonics kinetics of association volume change phosphate ions phosphate buffer |
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