Some physicochemical data on monohydrate citric acid solutions in water: solubility, density, viscosity, diffusivity, pH of standard solution, and refractive index

Laguérie, C.; Aubry, Michel; Couderc, Jean P.

doi:10.1021/je60068a031

Cited by 47 publications

(39 citation statements)

References 5 publications

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“…The density of citric acid monohydrate as reported by Laguerie et al [15] was d = 1.542 g cm −3 at 25 °C. Wilhoit and Shiao [16] measured, from 20 to 80 °C, the specific volumes of the solid citric acid by using a glass dilatometer and expressed their results by the following quadratic equation The volume expansion and the inner energy coefficients at 25 °C were also determined: ∂ ∂ = − with 1 atm = 101.325 kPa.…”

mentioning

confidence: 71%

Properties of Citric Acid and Its Solutions

Apelblat

2014

Citric Acid

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mentioning

confidence: 71%

Properties of Citric Acid and Its Solutions

Apelblat

2014

Citric Acid

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“…(6,7,11,13,17) In (28) From the knowledge of osmotic coefficients and solubility of acids in water, it is possible to determine the molar enthalpy of solution D sol H m (31) at saturation point:…”

Section: Resultsmentioning

confidence: 99%

“…(12)(13)(14)(15)(16)(17)(18)(19)(20) Applying the isopiestic method, osmotic coefficients of -tartaric, meso-tartaric, and -malic acids in the molality range (0.5 to 6) mol·kg −1 have been evaluated by Robinson, Smith, and Smith (8) and over the entire molality range of citric acid by Levien. (10) Vapour pressures of saturated aqueous solutions of these acids are unknown with the exception of citric acid.…”

Section: Introductionmentioning

confidence: 99%

The vapour pressure of water over saturated aqueous solutions of malic, tartaric, and citric acids, at temperatures from 288 K to 323 K

Apelblat

Dov

Wisniak

et al. 1995

The Journal of Chemical Thermodynamics

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“…The viscosity of aqueous adipic acid, the straight-chain C6 dicarboxylic acid, has only been measured for dilute solutions (Chmielewska and Bald, 2008). In the range where data is available, densities of aqueous solutions of adipic, glutaric, and citric acid show all similar concentration dependences (Laguerie et al, 1976;Chmielewska and Bald, 2008). To estimate the viscosity of the C6-rich phase, we therefore extrapolate the citric acid values to concentrations corresponding to solute mass fractions of 0.75-0.80, yielding viscosities of 100-500 mPa s. Applying these values, settling of 10 and 20 µm diameter AS-rich phase inclusions should occur at a rate of 0.5-3.3 and 2-13 µm min −1 , respectively.…”

Section: Settling Velocitymentioning

confidence: 99%

Liquid-liquid phase separation and morphology of internally mixed dicarboxylic acids/ammonium sulfate/water particles

et al. 2012

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Abstract. Knowledge of the physical state and morphology of internally mixed organic/inorganic aerosol particles is still largely uncertain. To obtain more detailed information on liquid-liquid phase separation (LLPS) and morphology of the particles, we investigated complex mixtures of atmospherically relevant dicarboxylic acids containing 5, 6, and 7 carbon atoms (C5, C6 and C7) having oxygen-to-carbon atomic ratios (O:C) of 0.80, 0.67, and 0.57, respectively, mixed with ammonium sulfate (AS). With micrometer-sized particles of C5/AS/H 2 O, C6/AS/H 2 O and C7/AS/H 2 O as model systems deposited on a hydrophobically coated substrate, laboratory experiments were conducted for various organic-to-inorganic dry mass ratios (OIR) using optical microscopy and Raman spectroscopy. When exposed to cycles of relative humidity (RH), each system showed significantly different phase transitions. While the C5/AS/H 2 O particles showed no LLPS with OIR = 2:1, 1:1 and 1:4 down to 20 % RH, the C6/AS/H 2 O and C7/AS/H 2 O particles exhibit LLPS upon drying at RH 50 to 85 % and ∼90 %, respectively, via spinodal decomposition, growth of a second phase from the particle surface or nucleation-and-growth mechanisms depending on the OIR. This suggests that LLPS commonly occurs within the range of O:C < 0.7 in tropospheric organic/inorganic aerosols. To support the comparison and interpretation of the experimentally observed phase transitions, thermodynamic equilibrium calculations were performed with the AIOMFAC model. For the C7/AS/H 2 O and C6/AS/H 2 O systems, the calculated phase diagrams agree well with the observations while for the C5/AS/H 2 O system LLPS is predicted by the model at RH below 60 % and higher AS concentration, but was not observed in the experiments.Both core-shell structures and partially engulfed structures were observed for the investigated particles, suggesting that such morphologies might also exist in tropospheric aerosols.

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Some physicochemical data on monohydrate citric acid solutions in water: solubility, density, viscosity, diffusivity, pH of standard solution, and refractive index

Cited by 47 publications

References 5 publications

Properties of Citric Acid and Its Solutions

Properties of Citric Acid and Its Solutions

The vapour pressure of water over saturated aqueous solutions of malic, tartaric, and citric acids, at temperatures from 288 K to 323 K

Liquid-liquid phase separation and morphology of internally mixed dicarboxylic acids/ammonium sulfate/water particles

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