What is Ethanol: Definition and 110 Discussions

Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic chemical compound. It is a simple alcohol with the chemical formula C2H6O. Its formula can be also written as CH3−CH2−OH or C2H5OH (an ethyl group linked to a hydroxyl group), and is often abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with a slight characteristic odor. It is a psychoactive drug, recreational drug, and the active ingredient in alcoholic drinks.
Ethanol is naturally produced by the fermentation of sugars by yeasts or via petrochemical processes such as ethylene hydration. It has medical applications as an antiseptic and disinfectant. It is used as a chemical solvent and in the synthesis of organic compounds. Ethanol is a fuel source.

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  1. dddd

    Molecular iodine in ethanol solution

    Hello everyone, Does iodine specie change after diluting in ethanol 99%? I’m talking about I-, KI or other kinds of of iodine species. Or it stays in I2 form? I’m looking to make 1% I2 molecular iodine ethanol solution from iodine crystals. Would the ratio be 10 g per 1 liter? Thank you all for...
  2. N

    Why and How Ethanol + Water + Raw Material contain Essential Oil

    Dear everyone. I wish you all happy and healthy after this Covid pandemic.Last week i used ethanol mixed with raw materials, got the solution ( suppose ethanol + oil + wax +etc ). And I add water to that Ethanol Solution above with ratio 1/1...inside the mixing solution it formed a resin ( slime...
  3. K

    Ethanol (Alcohol) 75% and isopropyl alcohol (75%) - any difference?

    I was buying and studying the label on a bottle of alcohol spray and a bottle of liquid alcohol. Their ingredients were Ethanol(Alcohol) 75% and isopropyl alcohol(75%) respectively. Is there any difference?
  4. I

    Chemistry Vapor pressure of ethanoic acid vs. ethanol

    I think the answer is D because both molecules can hydrogen bond with their OH groups, but the C=O bond in ethanoic acid is polar and contributes to dipole-dipole interactions. The solution says B is the correct answer, because ethanoic acid molecules strongly hydrogen bond so that most...
  5. D

    Chemistry Enthelpy chage for the production of ethanol

    from table the standard enthalpy of ethanol is ##\Delta H°=-277 \frac{KJ}{mol}## the grams of ethanol are ##0,002 cm^3*0,79\frac {g}{cm^3}=1,58*10^{-3}g## and the moles are ##\frac{1,58*10^{-3}g}{(24,02+16,00+6,06)\frac g {mol}}= 3,43*10^{-5}##mol By proportionality, having already the...
  6. W

    Why are Water and Ethanol densities specified at different temperatures?

    Why is the standard density of water given at 4°C while the density of ethanol is generally given at 20°C?
  7. W

    Find the amount of ethanol (70 degC) in gas phase in a tank at atm

    I first found the partial pressure of ethanol at 70 degrees using Antoine coefficients: Coefficients: A 7.68117 B 1332.04 C 199.2 Equation: And found a partial pressure of 0.7 bar...
  8. Roy S Ramirez

    Adjusting the pressure drop in an injection plate

    Hello everybody, I'm designing a gas pressure feed system for a hydrogen peroxide - ethanol rocket engine, and after analyzing the devised injection plate, I noticed it is very sensitive to the propellants' pressure drops and discharge coefficients. Once the plate is manufactured, the only...
  9. navneet9431

    NaOH vs C2H5OH: Reason for Disassociation

    If we put NaOH in water then it disassociates into ##OH^{-}## ions(hydroxyl ions) but if we put ##C_2H_5OH## in water it does not disassociates into ##OH^{-}## ions. What is the reason that ##NaOH## disassociates into ##OH^{-}## ions(hydroxyl ions) whereas ##C_2H_5OH## does not disassociate...
  10. J

    Enthelpy of water / ethanol at different ratios -- trend?

    Hello, I was doing some research on enthalpy of water-ethanol mixtures at different ratios, and when looking at all the information graphed, I don't understand why it produces the trend line it does. Why doesn't it produce a 'quadratic' trend line? Shouldn't having a 10:90 water-ethanol exert...
  11. N

    Fuel Cells for Isolated Electric Generation

    Hello, I am researching about fuel cells that use Ethanol as a fuel, because I want to buy a equiptment of approximate 5 Kw (Electric) that uses Ethanol as a fuel for electric generation in anyplace, where yet there is not supply of electrical Energy by wire. Have you heard anything about this...
  12. M

    MHB Why is Water Less Dense than Ethanol?

    Why is ethanol less dense than water if ethanol has a larger molecular weight. I think i heard it's something to do with water molecules being closer to each other. Why is this?
  13. G

    I How to remove Ethanol from Gasoline?

    I have an idea that should work but I need some accurate numbers. If i mix 1 gallons of gasoline with 1 gallon of water then let is separate i should get approx 90% gas and 110% water that contains the alcohol. I think I can use less water but don't know how much less, 1 pint, 2 pints, 3...
  14. Emmanuel74

    Bioethanol & Water Mixing: Solve Separation Problem

    I have been on a project for awhile now and it has to do with production of bio ethanol production from biomass,and also how to add water in ratio 60:40. i.e ethanol will be 60% while water will be 40% without separating. I have tried to mix water with ethanol in this ratio but it keeps...
  15. Saharka

    Heat of combustión of a mixture of two substances?

    Hello chemists, need some help here. I'm trying to calculate the power output of a certain otto cycle using different fuels, specifically gasoline, ethanol and different combinations of the two like 85% ethanol and 15% gasoline or 50% ethanol and 50% gasoline. However I have found it difficult...
  16. OMANII_93

    Calculating Heat Exchange Requirements for Ethanol Condenser

    Homework Statement Hi, I need someone to help me with this question. I tried to find the answer for two weeks I could not finde it. Anyone with the required experience can help! I will be so grateful. Question: A shell-and-tube heat exchanger is to act as a condenser: saturated ethyl alcohol...
  17. B

    Where does ethanol gas go in an enclosed space?

    What happens to ethanol vapor in an enclosed space like a room? Does it end up dissolving, or accumulating somewhere like the floor or towards the ceiling? If it does dissolve how long does it take?
  18. CMATT

    Organic Chemistry Recrystallization

    Homework Statement Why is ethanol a bad choice for recrystallization of phthalic acid? 2. The attempt at a solution I know phthalic acid is very soluble in water, so water is a great candidate to recrystallize phthalic acid. I also know water and ethanol are not miscible. But I don't know how...
  19. Harry Smith

    I Will ethanol destroy double layered graphene?

    I am doing a lab and we get silver epoxy resin on our double layered graphene sample where we didn't want it. We can take off the silver paint using ethanol but worry it may destroy the thin layer. Will ethanol be okay to use? Are there any suggestions on what to use?
  20. A

    Detecting drug in ethanol solvent using UV-Vis

    Hey Everyone, I'm having trouble detecting my drug dissolved in ethanol using UV-Vis spectroscopy. The peak absorbance of the drug is at 240 nm while the peak absorbance of the ethanol seems to be around 190 nm. Are these peaks too close to each other to get an accurate measurement? In the...
  21. P

    Ethanol gasoline blends - reality vs science

    Hello everyone, (Hope this is the right place to post this) I am wondering, and have for a while, if there is any "real" answers, as to why some people report much lower fuel economy running ethanol mixed gasoline fuel. Math says, that ethanol fuel is lower in BTU's than gasoline, so taking...
  22. MexChemE

    Psychrometry -- Ethanol in dry air

    Homework Statement Ethanol evaporates in a 10 x 20 x 50 ft3 room. Air is initially dry at a temperature of 30 °C and 765 mmHg of pressure. a) If the partial pressure of ethanol after vaporization is 40 mmHg, how many pounds of ethanol evaporated? b) The same air is compressed until it reaches a...
  23. A

    Ethanol Extraction for Food Flavors: Natural or Synthetic?

    I'm curious, in many flavors used in food (such as vanilla extract and other "natural flavors"), ethanol is used as a solvent to extract the flavors. Is this ethanol synthetic ethanol, or do companies normally get it from the wine/beer industries?
  24. E

    Can Ammonium Bicarbonate 'salt out' ethanol alcohol?

    I'm testing Ammonium Bicarbonate in a fermentation process. Is it possible for Ammonium Bicarbonate to 'salt out' Ethanol? Compounds such as Sodium Carbonate and Ammonium Sulfate are able to salt out ethanol.
  25. A

    Does ethanol evaporate in dried food?

    I was wondering, if ethanol is used in a food, as it commonly is with food flavorings (as a solvent), and that food is then dried out such that It is made into a powder or cereal or something, does all the ethanol completely evaporate? I know ethanol is very volatile and has a low boiling...
  26. S

    Calculating the Maximum Safe Volume of Ethanol in a Confined Space

    Hello The lower flammability point of ethanol is 3.5% v/v. How can I work out the max volume of ethanol in a specified space to be lower than the flammability point Eg If I have a 100l vessel 3.5% will be 3.5l of vapour in that 100l vessel that will make it ignitable - how can I convert 3.5 l of...
  27. nirmaljoshi

    Why Does Heat Generate When Mixing Ethanol and Water?

    Why heat is generated when ethanol is mixed with water? Please also explain why the existing hydrogen bond of water disintegrated to accommodate ethanol molecule?
  28. L

    Can Anyone Share an Ethanol Dielectric Function with Frequency Dependence?

    Hi, Does anyone have a dielectric function for ethanol or a paper where I can find it ? Thanks
  29. A

    Ethanol Acidity: Does It Gain or Lose a Proton?

    Is ethanol basic or acidic? It has an -OH group... but that does not necessarily mean basicity. How does ethanol react in water? Does it gain a proton, does it lose one, or does it lose the hydroxyde...?
  30. R

    Distilled Ethanol Safe To Drink?

    So I've read lab grade ethanol is dangerous, and so is alcohol made at home that is distilled because of methanol. My question is, if I used Vodka from the LCBO and distilled it at a temperature around ~78C, would 1-2 shots be safe to drink? I also understand that there is small amounts of...
  31. Superposed_Cat

    Determining ethanol and methanol content in homemade booze

    Hi, I've recently made some very budget homemade 'beer', butt I'm wondering is there an easy (doesn't have to be accurate) way to determining ethanol and methanol content. any help appreciated.
  32. Low-Q

    80% ethanol mixed with 20% diesel

    Would this mixdure be equivalent in performance and fuel economy as 95 octane gasoline? Any possible damages to the engine if I try this mixdure? Br. Vidar
  33. trollcast

    Physical Properties Dimethyl ether vs ethanol

    Homework Statement Explain the difference in the following properties of dimethyl ether and ethanol: 1) Solubility in water 2) Rate of evaporation Homework Equations The Attempt at a Solution 1) Due to the oxygen being bonded to 2 carbon atoms none of the hydrogen atoms in the...
  34. S

    Boiling Ethanol & Using a kitchen exhaust hood instead of a fume hood

    Hi, I'm doing a lab at home on photosynthesis for biology, in which I have to boil leaves in ethanol, and I have a few questions about safety for this. First of all, is it at all safe to actually boil denatured alcohol/ethanol, especially where people might inhale it? And depending on how safe...
  35. M

    Determination of Ethanol Content Using Titration

    Hi everyone! So, something sort of weird happened in analytical lab and I was wanting some guidance. I was trying to determine the ethanol concentration in a 4 Loko, a red wine, and a beer through acid/base titration. I pipetted a little bit of a diluted alcohol sample into a small beaker and...
  36. P

    Understanding Hydrogen Bonding in Ethanol Molecules

    Hey, How do you know how many hydrogen bonds ethanol molecules will form with each other? I know there are 3 sites where H bonds could form (2 lone pairs on oxygen and the hydrogen) but with something like hydrogen fluoride, each molecule only forms 1 H bond on average so shouldn't something...
  37. L

    Speed of sound - why does adding ethanol to water increase the speed of sound

    If you have a tank of water then the speed of sound is 1482 m/s. If you add ethanol, the speed of sound increases. This seems to be pretty linear with the % concentration of ethanol. why does ethanol (or propanol) increase the speed of sound? thanks
  38. J

    Chemistry % / Volume of ethanol

    Homework Statement Using the density of ethanol at 24 degrees Celsius how would I find the %/volume? I can find lots of places that have 20 or 25 degrees but I don't know where to find something referring to 24 degrees? Homework Equations The Attempt at a Solution I have to...
  39. A

    Chlorine (bleach) and alcohol (ethanol?).

    I recently saw a few videos on Youtube of people making a reaction by putting chlorine and alcohol together in a bottle. For the life of me I can't figure out why that reaction would work, and I wondered if anybody could give me an equation. Thanks.
  40. Q

    Can alcohol (ethanol) remove or destroy dishwasher liqiud?

    Can alcohol (ethanol) remove or destroy dishwasher liqiud?!? hello friends..please answer me on this question .. if there was a little dishwasher liquid on skin with and contacted with some alcohol on it,and if alcohol mixed with dishwasher can it destroy or remove dishwasher?i ask this...
  41. M

    Help finding data for specific volume of ethanol in a water mixture?

    I have just done a lab on measuring the change in volume of an ethanol-water mixture. One of our tasks is to use the intercept method to determine the specific volumes of both the water and ethanol components at certain concentrations using a tangent line. I have the tangent line at 50%...
  42. J

    What Is the Role of Ethanol in Precipitating Salts?

    Homework Statement what is the purpose of adding ethanol in step 5 in the following description? http://www.creative-chemistry.org.uk...s/N-ch5-08.pdf Homework Equations The Attempt at a Solution Does adding ethanol make the liquid phase (which is now a homogenous mixture) less...
  43. I

    Finding Mass through Stoichiometry of Ethanol in a chemical equation

    Homework Statement 1) What is the mass of 100% Ethanol? 2) How much ethanol would be expected from 18% glucose solution? 3) What else will be generated? How can we calculate this amount? Given: Fermentation Equation: C6H12O6(aq) + 2C2H5OH(aq) + 2CO2(g) + Heat...
  44. Z

    Chemistry Calculating the Mass of a Mole of Ethanol (C2H6O)

    Homework Statement How would I relate the molecular mass of ethanol (46.07 g/mol) to its formula (C2H6O) and indicate how much a mole of ethanol would weigh? Homework Equations The Attempt at a Solution
  45. M

    How does temperature affect volume contraction in ethanol-water mixtures?

    Homework Statement Ok, I have a volumetric flask filled with 67ml of ethanol and 36.38ml of water to make up 100ml of solution. My experiment was to find out how temperatue affects volume contraction. Part of my analysis was to justify how much volume contracion changed due to volume, a...
  46. M

    Strength of hyrdrogen charges between ethanol and water

    Is a hydrogen on an ethanol more or less positive than on a water molecule. I think the hydrogen is more positive on a water molecule, but I still don't understand why? Could someone help me figure this out... please and thank you :wink:
  47. J

    Thermodynamic Ethanol Saturation

    I am doing a project and this is a problem were are having: We are trying to calibrate a MQ-3 sensor with an arduino uno board, however we have to do a hand calculation to arrive at the theoretical ethanol content (amount of ethanol saturated in the air) before we can calibrate the sensor...
  48. J

    Thermodynamic Ethanol Saturation

    I am try to calibrate an MQ-3 sensor with and Arduino board. However, I need a little help with thermodynamics, I am using a container of alcohol which has a volume of 591.470 mL, only 100mL is filled with 100 proof (50%) alcohol. However I need to calibrate the sensor to the content of...
  49. E

    Energy resultant of Solidification Point Of Ethanol

    1. Homework Statement a beaker contains 200mL of ethyl alcohol at 22 C degrees. what is the minumum amount of energy that must be removed to produce solid ethyl alcohol.. the melting/freezing pt is -114 C degrees Latent heat fusion = 1.09x10^5 density is 790kg/m^3 specific heat capacity...
  50. F

    Reaction of Fructose with Ethanol

    Homework Statement Show the reaction of fructose and ethanol. This is an example of the formation of ______. The homework concerns the formation of hemiacetals and hemiketals as well as the cyclic forms of important sugars.Homework Equations NoneThe Attempt at a Solution I believe my...