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- W164824703 abstract "Sodium aluminate solutions and their precipitates have been investigated by Raman spectroscopy. All Raman data are consistent with the existence of Al(OH)₄⁻ and Al₂O(OH)₆ ²⁻ anionic species in sodium aluminate solutions. In supersaturated solutions, both anions are in equilibrium during the induction process. After the induction period, sodium aluminate solutions produce a precipitate which contains neither the Al(OH)₄⁻ anion nor the Al₂O(OH)₆ ²⁻ anion. -- Quantitative Raman studies with 0.23 M NaNO₃ as an internal standard were employed to elucidate the equilibria in sodium aluminate solutions. The best values of the molar scattering constants Ji are equal to 0.25 ± 0.03 for the Al(OH)₄⁻ and 0.57 ± 0.18 for the Al₂O(OH)₆ ²⁻ species relative to the 1.0 M NO₃⁻ ionic mode at 1052 cm⁻¹. With these Ji values the formation quotient Q and equilibrium constant K are estimated. -- In addition, studies of the effects of temperature on the Raman frequencies and halfwiths of CO₃²⁻, Al(OH)₄⁻ and Al(OD)₄ anions in H₂O and D₂O reveal evidence for the presence of strong hydrogen bonds between these anions and water. There is no significant change in the hydrogen band strength at temperatures up to 150°C." @default.
- W164824703 created "2016-06-24" @default.
- W164824703 creator A5053008395 @default.
- W164824703 date "1995-01-01" @default.
- W164824703 modified "2023-09-26" @default.
- W164824703 title "Raman studies on the aluminate and carbonate anions in aqueous solutions" @default.
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