Ethylene glycol in water

Ethylene glycol, C2H4(OH)2, is a colorless liquid used as automobile antifreeze. If the density at 20°C of a 4.028 m solution of ethylene glycol in water is 1.0241 g/mL, what is the molarity of the solution The molar mass of ethylene glycol is 62.07 g/mol. 

A 4.028 m solution of ethylene glycol in water contains 4.028 mol of ethylene glycol per kilogram of water. To find the solution s molarity, we need to find the number of moles of solute per volume (liter) of solution. The volume, in turn, can be found from the mass of the solution by using density as a conversion factor. 

Liquid Liquid Alcoholic drinks (ethanol in water) Antifreeze (ethylene glycol in water)... 

Volume percent is similar to mass percent. It is generally preferred when working with solutions where all the components are liquids, such as antifreeze solution (ethylene glycol in water). It can be calculated by a formula similar to that of mass percent. 

You have encountered practical applications of freezing point depression if you have added antifreeze—a solution of ethylene glycol in water—to your car s radiator or have seen airplane de-icers used before takeoff. Also, roads are salted with NaCl and CaCl2 in winter to lower the freezing point of water, causing road ice to melt. 

Forty-five kilograms of a solution containing 0.3 wt fraction ethylene glycol in water is to be extracted with furfural. Using Fig. 3.10a and 3.IOe, calculate ... 

Fig. 2. EPR spectra of tyrosine radicals (A) the stable tyrosine radical, Tyr[,-, in photosystem II (65 ij,M) in a frozen solution containing 30% (v/v) ethylene glycol in water and (B) the stable tyrosine radical in the B2 subunit of Escherichia coli ribonucleotide reductase (50 jtiAf) in a frozen solution containing 10% (v/v) ethylene glycol in water. Conditions temperature, 8.0 K microwave frequency, 9.05 GHz magnetic field modulation amplitude, 2 G magnetic field modulation frequency, 100 kHz microwave power, 0.7 /iW.

Zhang et al. [2005b] studied the effects of various percents of ethylene glycol in water (15,20, and 28%) on cationic surfactant solution properties. Using commercial cationics from Akzo Nobel (Ethoquad 012 and 013), they observed that the cosolvent reduced the upper temperature limit for drag reduction, maximum percent drag reduction, maximum critical wall shear stress, and relative shear viscosity. The formation of TLMs was hampered, but the addition of excess sodium salicylate promoted TLM... 

Oesterfelt, F, Rief, M., and Gaub, H. E. 1999. Single molecule force spectroscopy by AFM indicates hleical structure of poly(ethylene-glycol) in water, New J Phys 1, 6.1-6.11. 

Water absorption % volume 168 h, 55% ethylene glycol in water. +1 (23)... 

Automotive antifreeze consists of ethylene glycol, CH2(OH)CH2(OH), a nonvolatile nonelectrolyte. Calculate the boiling point and freezing point of a 25.0 mass % solution of ethylene glycol in water. 

F. Oesterhelt, M. Rief, and H.E. Gaub, Single Molecule Force Spectroscopy by AFM Indicates Helical Structure of Poly(ethylene-glycol) in Water. New J. Phys., 1,6.1-6.11,1999. 

Vapor-liquid equilibrium data of poly(ethylene glycol) in water and ethanol... 

Errors in the short time dynamics of a stochastic simulation can be addressed by comparison to MD simulations, which are expected to be more realistic. This comparison has been performed for ethylene glycol in water by Widmalm and Pastor [51], Xiang et aL compared GLE and BD simulations of nonane [16]. Each of these investigations indicates that the initial drop in the correlation function occurs more rapidly in the more sophisticated simulation. After this initial drop, correlation functions calculated from the various simulations decay at about the same rate. 

Table 1 Dynamic viscosities (mPa s) for different percentages of glycerol and ethylene glycol in water at 25 °C [33, 34]...

Concentration of glycerol/ethylene glycol in water (vol.%) Dynamic viscosity of glycerol-water mixture at 25 °C (mPa s) Dynamic viscosity of ethylene-gly col-water mixture at 25 °C (mPa s)... 

Ethylene glycol, C2H,j02 (antifreeze), is mixed with water in the radiators of cars to protect them against freezing. Draw a molecular representation of a solution of ethylene glycol in water. (Molecular models of ethylene glycol can be found in the margin of Section 2-1.)... 

Le Peuch and Balny have examined the hydrophobic chromatography of a number of proteins on phenylbutylamine-agarose at sub-zero temperatures. They reported that ovalbumin and catalase could be separated from chymo-trypsin and chymotrypsinogen which were retained at —15 °C in the presence of 30% ethylene glycol in water. Chymotrypsinogen was eluted on raising the temperature to 4 °C, and at 20 °C in 1 1 ethylene glycol-water the chymotrypsin was eluted. 

Motokawa, R., Annaka, M., Nakahira, T. and Koizumi, S. (2004) SANS study on microstructure of poly(N-isopropylacrylamide)-block-poly(ethylene glycol) in water. Colloid. Surf. B Biointerf, 38,213-219. 

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