title: Spectrophotometric determination of the first protonation constant of orthovanadate.
abstract: The first protonation constant for VO(3-)(4) has been determined spectrophotometrically at 25 degrees in 1M sodium chloride and found to have the value log K = 13.29 +/- 0.01. Individual absorption spectra for VO(3-)(4) and HVO(2-)(4) have been calculated (for the range 218-350 nm) from experimental absorbance measurements.
authors.affiliation: Department of Chemistry, University of Stellenbosch, Stellenbosch 7600, Republic of South Africa.
authors.forename: J J
authors.initials: JJ
authors.lastname: Cruywagen
authors.forename: J B
authors.initials: JB
authors.lastname: Heyns