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- W2023205928 endingPage "9642" @default.
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- W2023205928 abstract "Phosphoric acid in water and heavy water has been studied by Raman and infrared spectroscopy over a broad concentration range (0.00873–1.560 mol kg−1) at 23 °C. The vibrational modes of the PO4 skeleton (C3v symmetry) of H3PO4(aq) and D3PO4(D2O) have been assigned. In addition to the P–O stretching modes a deformation mode has been detected, δPO–H(D) at 1250 and 935 cm−1, respectively. In addition to the modes of the phosphoric acid and heavy phosphoric acid a mode of the dissociation product H2PO4− and D2PO4− has been detected at 1077 cm−1 and 1084 cm−1 respectively. H3PO4 and D3PO4 is hydrated in aqueous solution which could be verified by Raman spectroscopy following the νPO and νsP(OH)3 mode as a function of temperature. These modes show a pronounced temperature dependence inasmuch as νPO shifts to higher wavenumbers with temperature increase and νsP(OH)3 to lower wavenumbers. In the range between 300–600 cm−1 the deformation modes have been observed. In very dilute H3PO4 solutions however, the dissociation product is the dominant species. The dissociation degree, α for H3PO4(aq) and D3PO4(D2O) as a function of dilution has been measured at 23 °C. In these dilute H3PO4(aq) and D3PO4(D2O) solutions no spectroscopic features for a dimeric species of the formula H6P2O8 and D6P2O8 could be detected. Quantitative Raman measurements have been carried out to follow the dissociation of H3PO4 and D3PO4 over a very broad concentration range and also as a function of temperature. From the dissociation data, the pK1 value for H3PO4 has been determined to 2.14(1) and for D3PO4 to 2.42(1) at 23 °C. In the temperature interval from 24.5 to 99.7 °C the pK1 values for H3PO4(aq) have been determined and thermodynamic data have been derived." @default.
- W2023205928 created "2016-06-24" @default.
- W2023205928 creator A5028495012 @default.
- W2023205928 date "2010-01-01" @default.
- W2023205928 modified "2023-10-16" @default.
- W2023205928 title "Raman- and infrared-spectroscopic investigations of dilute aqueous phosphoric acid solutions" @default.
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- W2023205928 doi "https://doi.org/10.1039/c0dt00417k" @default.
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