Ethanol freezing point

Ethyl alcohol (ethanol, freezing point -114.1°C, boiling point 78.3°C, density 0.7893, flashpoint 14°C) is also named, industrial alcohol, grain alcohol, and alcohol. Ethyl alcohol is miscible in all proportions with water or with ether. When ignited, ethyl alcohol burns in air with a pale blue, transparent flame, producing water and carbon dioxide. The vapor forms an explosive mixture with air and is used in some internal combustion engines under compression as a fuel such mixtures are frequently referred to as gasohol. 

Like brines, alcohols were readily available and widely used as antifreeze Hquids in the early 1900s. Both methanol and ethanol offer exceUent heat transfer and efficient freeze point depression. However, the alcohols have the distinct disadvantage of their low boiling points. During the summer months when the engines operate hot, significant amounts of the alcohols are lost because of evaporation. These evaporative losses result in cosdy make-up requirements. Additionally, the alcohols have very low flash points and potentially flammable vapors. These safety concerns have, particularly in recent years, caused the use of alcohols to be completely discontinued for most heat-transfer systems. 

Vodka is advertised to be 80 proof. That means that the ethanol (C2H5OH) concentration is 40% (two significant figures) by volume. Assuming the density of the solution to be 1.0 g/mL, what is the freezing point of vodka The density of ethanol is 0.789 g/mL. 

Mono ethanol amine (MEA). A solvent used to dissolve other laundry detergent ingredients. It also lowers the freezing point of liquid laundry products to allow them to be transported in cold weather. 

C12-0065. Estimate the freezing point of a wine that is 12% by mass ethanol. (Ignore all other solutes.)... 

C12-0097. When an aqueous solution cools to low temperature, part of the water freezes as pure ice. What happens to the freezing point of the remaining solution when this occurs A glass of wine placed in a freezer at -10 C for a very long time forms some ice crystals but does not completely freeze. Compute the molality of ethanol in the remaining liquid phase. 

The freezing of liquids in vials, bottles or flasks in a liquid bath is the most common freezing method used in laboratories. As the liquid must have a low melting point, alcohol (ethanol, melting point -114 °C) cooled by C02 (boiling point -80 °C at 1 atm) is frequently used. The bath can also be cooled by refrigerated coils. 

Ethanol (C2HgO) has a freezing point of -114°C. 1-propanol (CgHgO) has a melting point of -88°C. At 25°C (where both compounds are liquids), which one is likely to have the higher vapor pressure, and why ... 

Ethanol has the higher vapor pressure at 25°C. First, notice that a freezing point and a melting point are the same thing — that point is the temperature at which a substance undergoes the liquid-to-solid or solid-to-liquid phase transition. Next, compare the freezing/melting points of... 

Ethanol s freezing point is much lower than gasoline, though it rises quickly as the water content of ethanol increases. Freezing of ethanol in fuel storage and distribution systems is not a concern. 

Ethanol can be used for the short-term preservation of tissue. Calculate the freezing point of a solution mixed if you were to dissolve 0.500 g of a nonvolatile triose, C3H6O3, in 25 g ethanol (C2H5OH, freezing point pure = — 114.6°C, kf = 1.99°C hn). 

Example 4. The freezing point of a 20% by weight aqueous solution of ethanol is 10.92°C. What is the activity coefficient of water in this solution ... 

Calculate approximately how much ethanol (CgHgOH) would be needed per gallon of radiator water to keep it from freezing at temperatures down to 10° F below the freezing point. 

What are the boiling point and freezing point of a 0.40m solution of sucrose in ethanol ... 

The freezing-point depression constant of pure H2SO4 is 6.12 K kg mol . When 2.3 g of ethanol (C2H5OH) is dissolved in 1.00 kg of pure sulfuric acid, the freezing point of the solution is 0.92 K lower than the freezing point of pure sulfuric acid. Determine how many particles are formed as 1 molecule of ethanol goes into solution in sulfuric acid. 

In order to minimize protein-protein interactions the concentration of protein is kept as low as possible, but high enough to permit practical large-scale processing. Concentration of the organic solvent (mostly ethanol) and the temperature are maintained as low as possible in order to minimize protein denaturation. The mole fractions of ethanol in the mixture do not generally exceed 0.163, and the temperature is maintained between 0°C and the freezing point. Concen-... 

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