A Review of Sodium Fluoride Solubility in Water

Reynolds, Jacob G.; Belsher, Jeremy D.

doi:10.1021/acs.jced.7b00089

Cited by 43 publications

(31 citation statements)

References 38 publications

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“…The suspension sedimented by NaOH and then only washed with ethanol was characterized by XRD (Supporting Information Figure S2). NaF solubility in ethanol being lower than in water, , the presence of NaF in the XRD pattern indicates that some of the Na + ions react with the F-terminations to form NaF. The replacement of −F by −O terminations has been documented previously, , but, to our knowledge, the loss mechanism was not discussed.…”

Section: Discussionmentioning

confidence: 61%

“…To determine whether this loss was due to the formation of fluoride salts or simply due to an exchange with hydroxyls in solution, one part of the sedimented powders, obtained by the addition of NaOH, was washed with EtOH only, instead of water, and then dried. Since in general, fluoride salts have higher solubilities in water than EtOH, , the use of the latter increased the chances that any fluoride salts formed are not washed away and could thus be detected.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions

et al. 2018

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Herein, the stabilities of aqueous Ti 3 C 2 T z (MXene) colloidal suspensions were studied as a function of pH and sodium chloride concentrations using ς-potential and dynamic light scattering measurements. Complete sedimentation was observed when the pH was changed to 5 or 10. In the low pH regime, protons saturate the surface functional groups, rendering the ς-potential less negative that, in turn, leads to aggregation. In the high pH regime, the ς-potential remained constant up to a pH of almost 12. As the molarity of NaCl increases from 0 to 0.04, the ς-potential goes from −35 to −22.5 mV. At a molarity of 0.02, sedimentation was observed. When the pH or NaCl concentration is high, sedimentation occurred, presumably, because of a reduction in the double-layer thickness. In all cases, the sediment comprised crumpled Ti 3 C 2 T z flakes. After adding charged nanoparticles to the colloidal suspension, at neutral pH, subsequent transmission electron microscope micrographs showed that the negative gold nanoparticles preferred the edges, whereas the positive ones preferred the surfaces. The charge differences between the edges and faces open opportunities for direct edge or face-specific organic functionalizations, similar to work done on other twodimensional materials.

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Section: Discussionmentioning

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions

et al. 2018

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“…Despite the weak interaction with water, NaNO 2 has an extremely high water solubility, demonstrating that strong interactions with water are not a prerequisite for high water solubility. Indeed, NaF is much less soluble in water, only ∼0.99 mol·kg –1 water at 25 °C, even though fluoride has a strong interaction with water. , A strong water interaction is not the dominant criteria for controlling solubility.…”

Section: Discussionmentioning

confidence: 99%

A Review of Sodium Nitrite Solubility in Water and Physical Properties of the Saturated Solutions

2021

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The solubility of sodium nitrite (NaNO2) in water is important to many industries, including those of heat pumps, oil extraction, and the management of alkaline nuclear waste. This study reviews solubility data for NaNO2 in water between the freezing point (−19 °C) and boiling point (128 °C) of a saturated solution. The temperature of the transition between the hemihydrate and anhydrous NaNO2 solid phases occurs at ca. −5 °C. There is excellent agreement between most studies above 0 °C, with the average solubility at 25 °C reported being 12.4 mol·kg–1 water. The electrical conductivity, viscosity, and density of saturated solutions were also reviewed, with mean values from several studies reported at 25 °C. The intrinsic volume of dissolved NaNO2 determined in this study (36.5 cm3·mol–1) is only 6% different from the value determined by extrapolating the density of molten salt to ambient temperatures. The flow in concentrated NaNO2 solutions behaves more like a molten salt than a soft colloidal behavior that more hydrated electrolytes resemble. Indeed, given that there is only ∼0.87 mol of water per mole of dissolved ion at 128 °C, the extremely high solubility of NaNO2 in water resembles a hydrated molten salt. A thermodynamic-based solubility model was developed.

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“…The overall variation is on the order of a factor of five. A more detailed study could yield quantitative data about reaction volume as the 19 F signals are complemented with 11 B NMR spectra at pressure (see Reynolds and Belsher, 2017). Fig.…”

Section: Discussionmentioning

confidence: 99%

Aqueous geochemistry at gigapascal pressures: NMR spectroscopy of fluoroborate solutions

Ochoa

Pilgrim

Kerr

et al. 2019

Geochimica et Cosmochimica Acta

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Aqueous geochemistry could be extended considerably if nuclear-magnetic resonance (NMR) methods could be adapted to study solutions at elevated temperatures and pressures. We therefore designed an NMR probe that can be used to study aqueous solutions at gigapascal pressures. Fluoride solutions were chosen for study because 19 F couples to other nuclei in the solutions (31 P and 11 B) in ways that make peak assignments unequivocal. Correspondingly, NMR spectra of 19 F-and 11 B were collected on aqueous HBF 4-NH 4 PF 6 solutions to pressures up to 2.0 GPa. At pressure, peaks in the 19 F spectra were clear and assignable to the BF 4 À (aq), F À (aq) and BF 3 OH À (aq) ions, and these aqueous complexes varied in signal intensity with pressure and time, for each solution. Peaks in the 11 B spectra at pressure could be assigned to the BF 4 À (aq) and BF 3 OH À (aq) species. Additionally, there is a single peak that is assignable to H 3 BO 3 o (aq) and B(OH) 4 À (aq) in rapid-exchange equilibria. These peaks broaden and move with pressure in ways that suggest reversible interconversion of borate and fluoroborate species. The PF 6 À ion was found to provide a suitable 19 F shift and intensity standard for high-pressure spectra because it was chemically inert. The positions and intensities of the doublet peak also remains constant as a function of pressure and pH. Addition of electrolytes considerably distorts the phase diagram of water such that the stability region of the aqueous solution expands to well beyond the 0.8 GPa freezing pressure of pure water; some fluoroborate solutions remain liquid until almost 2.0 GPa.

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A Review of Sodium Fluoride Solubility in Water

Cited by 43 publications

References 38 publications

Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions

Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions

A Review of Sodium Nitrite Solubility in Water and Physical Properties of the Saturated Solutions

Aqueous geochemistry at gigapascal pressures: NMR spectroscopy of fluoroborate solutions

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A Review of Sodium Fluoride Solubility in Water

Cited by 43 publications

References 38 publications

Effect of Edge Charges on Stability and Aggregation of Ti3C2Tz MXene Colloidal Suspensions

Effect of Edge Charges on Stability and Aggregation of Ti3C2Tz MXene Colloidal Suspensions

A Review of Sodium Nitrite Solubility in Water and Physical Properties of the Saturated Solutions

Aqueous geochemistry at gigapascal pressures: NMR spectroscopy of fluoroborate solutions

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Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions

Effect of Edge Charges on Stability and Aggregation of Ti₃C₂T_z MXene Colloidal Suspensions