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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Madsen, L., Slutsky, L.J., White, R.D. et al. Acoustic absorption in aqueous potassium phosphate. J Solution Chem 9, 715–722 (1980). https://doi.org/10.1007/BF00646792
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DOI: https://doi.org/10.1007/BF00646792