Hexane Answers
what is the significance of performing solvent partitioning using hexane and ethyl acetate?
Q. if you have a source, id very much appreciate it. im performing solvent partitioning (using hexane and ethyl acetate) from an ethanolic plant extract. i need sources! :) ill be using hexane and ethyl acetate separately. hexane first, then ethyl acetate. my extract was soaked in ethanol.
Asked by marketer - Tue Feb 10 04:30:49 2009 - Chemistry - 2 Answers - Comments
A. ethanol is miscible with wataer that you have in plants, when you add solvents that are immiscible with water to your extract, you will get 2 partiions: 1.organic that will contain hexane and ethylacetate. This layer will pull all stuff soluble in organics. It will also contain some ethanol. 2. aqueous that will contain inorganics and other stuff insoluble in organic layer thus you achieve extraction of organic compounds from your plant. You can evaporate organic layer and use it for what whatever you need, like chromatography. You use ethanol for initial extraction because it is miscible with water and extraction is more effective, and then you rid of water and compounds soluble in it using extraction with hexanes/ethylacetate.
Answered by Anatol - Tue Feb 10 05:49:42 2009
Q. if you have a source, id very much appreciate it. im performing solvent partitioning (using hexane and ethyl acetate) from an ethanolic plant extract. i need sources! :) ill be using hexane and ethyl acetate separately. hexane first, then ethyl acetate. my extract was soaked in ethanol.
Asked by marketer - Tue Feb 10 04:30:49 2009 - Chemistry - 2 Answers - Comments
A. ethanol is miscible with wataer that you have in plants, when you add solvents that are immiscible with water to your extract, you will get 2 partiions: 1.organic that will contain hexane and ethylacetate. This layer will pull all stuff soluble in organics. It will also contain some ethanol. 2. aqueous that will contain inorganics and other stuff insoluble in organic layer thus you achieve extraction of organic compounds from your plant. You can evaporate organic layer and use it for what whatever you need, like chromatography. You use ethanol for initial extraction because it is miscible with water and extraction is more effective, and then you rid of water and compounds soluble in it using extraction with hexanes/ethylacetate.
Answered by Anatol - Tue Feb 10 05:49:42 2009
Hexane evaporates much faster than ethanol evaporates because?
Q. a. ethanol forms internal hydrogen bonds that require more energy to break. b. hexane forms hydrogen bonds with ethanol. c. more than one of these. d. hexane forms internal hydrogen bonds which require more energy to break.
Asked by La la Lynn - Wed May 11 14:16:29 2011 - Chemistry - 2 Answers - Comments
A. a.
Answered by Purna chandra Sahu - Wed May 11 14:19:13 2011
Q. a. ethanol forms internal hydrogen bonds that require more energy to break. b. hexane forms hydrogen bonds with ethanol. c. more than one of these. d. hexane forms internal hydrogen bonds which require more energy to break.
Asked by La la Lynn - Wed May 11 14:16:29 2011 - Chemistry - 2 Answers - Comments
A. a.
Answered by Purna chandra Sahu - Wed May 11 14:19:13 2011
What happens when hexane is ignited in an evaporating basin?
Q. What happens when you add bromine water to hexane? What is the reaction type for the reaction with bromine? Also what would happen if you did the same experiments with cyclohexane? Please help! Thanks =)
Asked by Janey - Wed May 27 09:32:04 2009 - Chemistry - 2 Answers - Comments
A. This is a topic in organic chemistry under qualitative analysis of organic compounds. Hexane is a good example of saturated hydrocarbon which means that all carbons have either four or three hydrogens bonded to them and there are no double bonds, triple bonds or rings. Saturated hydrocarbons are also grouped together because they react more or less the same way. These two procedures (igniting and adding bromine water) that you've mentioned in fact tests for the unsaturation of compounds. The first one--called the ignition test (for unsaturation)--is where you ignite a substance in the evaporating dish and you observe the smoke above the flame. The darker or sootier the smoke, the more unsaturated the compound. On the other hand if the… [cont.]
Answered by happyman - Wed May 27 10:53:23 2009
Q. What happens when you add bromine water to hexane? What is the reaction type for the reaction with bromine? Also what would happen if you did the same experiments with cyclohexane? Please help! Thanks =)
Asked by Janey - Wed May 27 09:32:04 2009 - Chemistry - 2 Answers - Comments
A. This is a topic in organic chemistry under qualitative analysis of organic compounds. Hexane is a good example of saturated hydrocarbon which means that all carbons have either four or three hydrogens bonded to them and there are no double bonds, triple bonds or rings. Saturated hydrocarbons are also grouped together because they react more or less the same way. These two procedures (igniting and adding bromine water) that you've mentioned in fact tests for the unsaturation of compounds. The first one--called the ignition test (for unsaturation)--is where you ignite a substance in the evaporating dish and you observe the smoke above the flame. The darker or sootier the smoke, the more unsaturated the compound. On the other hand if the… [cont.]
Answered by happyman - Wed May 27 10:53:23 2009
What is the boiling point of hexane at 600 mm Hg?
Q. What is the boiling point of hexane at 600 mm Hg?
Asked by behappy94 - Sat Dec 12 15:03:36 2009 - Chemistry - 1 Answers - Comments
A. 61.6 C or 334.7 K
Answered by C K - Sat Dec 12 15:30:21 2009
Q. What is the boiling point of hexane at 600 mm Hg?
Asked by behappy94 - Sat Dec 12 15:03:36 2009 - Chemistry - 1 Answers - Comments
A. 61.6 C or 334.7 K
Answered by C K - Sat Dec 12 15:30:21 2009
You spot an unknown on TLC plate and used 90:10 hexane/ethyl acetate solvent and saw a single spot at origin?
Q. Now how would you fix the 90:10 hexane/ethyl acetate ratio to get a better tlc analysis? any possible ideas of what mixture would be best?
Asked by Mathquestion - Fri Jul 16 21:13:28 2010 - Chemistry - 3 Answers - Comments
A. Not answerable unless you tell me what the stationary phase is. If it's a plain silica coating (or it's derivatized with some hydrophilic moiety) then you probably need to increase the proportion of ethyl acetate and/or add a little Ac OH. If the coating is derivatized with C-18 (or some other hydrophobic moiety), you probably need to increase the proportion of hexane.
Answered by Kellie Y - Fri Jul 16 23:08:42 2010
Q. Now how would you fix the 90:10 hexane/ethyl acetate ratio to get a better tlc analysis? any possible ideas of what mixture would be best?
Asked by Mathquestion - Fri Jul 16 21:13:28 2010 - Chemistry - 3 Answers - Comments
A. Not answerable unless you tell me what the stationary phase is. If it's a plain silica coating (or it's derivatized with some hydrophilic moiety) then you probably need to increase the proportion of ethyl acetate and/or add a little Ac OH. If the coating is derivatized with C-18 (or some other hydrophobic moiety), you probably need to increase the proportion of hexane.
Answered by Kellie Y - Fri Jul 16 23:08:42 2010
can hexane be used in place of toluene for extraction of the same substance?
Q. I want to know whether they are same enough so that if toluene extracts something out from a solution, will hexane do it? I only have hexane in my lab right now... I am trying to extract a secondary plant product-a terpene
Asked by rubens gates - Mon Jan 11 06:49:59 2010 - Chemistry - 3 Answers - Comments
A. quite likely, but without you telling us exactly what you are trying to extract, people answering can only guess!
Answered by Colin - Mon Jan 11 07:19:33 2010
Q. I want to know whether they are same enough so that if toluene extracts something out from a solution, will hexane do it? I only have hexane in my lab right now... I am trying to extract a secondary plant product-a terpene
Asked by rubens gates - Mon Jan 11 06:49:59 2010 - Chemistry - 3 Answers - Comments
A. quite likely, but without you telling us exactly what you are trying to extract, people answering can only guess!
Answered by Colin - Mon Jan 11 07:19:33 2010
Why is salicylic acid soluble in hexane and not water?
Q. Please help! I thought that non-polar dissolve in non-polar and polar dissolve in polar...but salicylic acid is polar and water is polar but everywhere says it doesn't dissolve in water! And I don't even know about hexane!
Asked by GirlieChica - Thu Nov 5 18:13:18 2009 - Chemistry - 1 Answers - Comments
A. Not all acids are necessary highly polar. Some organic acids such as this are more nonpolar and don't freely give up the proton to be water soluble. That benzene or phenyl group on it makes it hydrophobic instead of hydrophilic.
Answered by Chris G - Thu Nov 5 18:18:08 2009
Q. Please help! I thought that non-polar dissolve in non-polar and polar dissolve in polar...but salicylic acid is polar and water is polar but everywhere says it doesn't dissolve in water! And I don't even know about hexane!
Asked by GirlieChica - Thu Nov 5 18:13:18 2009 - Chemistry - 1 Answers - Comments
A. Not all acids are necessary highly polar. Some organic acids such as this are more nonpolar and don't freely give up the proton to be water soluble. That benzene or phenyl group on it makes it hydrophobic instead of hydrophilic.
Answered by Chris G - Thu Nov 5 18:18:08 2009
How do you draw a Newman projection for hexane while sighting down C2-C3?
Q. This projection is not for cyclohexane, but for the alkane chain hexane.
Asked by Cody - Sat Feb 19 02:40:18 2011 - Chemistry - 1 Answers - Comments
Q. This projection is not for cyclohexane, but for the alkane chain hexane.
Asked by Cody - Sat Feb 19 02:40:18 2011 - Chemistry - 1 Answers - Comments
How many grams of hexane must be burned to produce one million kj of heat?
Q. How many grams of hexane must be burned to produce one million kj of heat? the heat of combusion of hexane is 4163 k J/mole...
Asked by ruflubber - Sat Feb 7 14:36:03 2009 - Chemistry - 1 Answers - Comments
A. 1 mole hexane weights 86 g 86 g : 4163 = x : 1000 x = 20658 g
Answered by Dr.A - Sat Feb 7 15:01:27 2009
Q. How many grams of hexane must be burned to produce one million kj of heat? the heat of combusion of hexane is 4163 k J/mole...
Asked by ruflubber - Sat Feb 7 14:36:03 2009 - Chemistry - 1 Answers - Comments
A. 1 mole hexane weights 86 g 86 g : 4163 = x : 1000 x = 20658 g
Answered by Dr.A - Sat Feb 7 15:01:27 2009
Why do some compounds dissolve in both water and hexane?
Q. Why do some compounds dissolve in both water and hexane? So how do you tell is a compound is going to be attracted to water or hexane or both?
Asked by I S - Wed Nov 7 23:26:09 2007 - Chemistry - 3 Answers - Comments
A. it doesnt necessarily need to be a soap or detergent, compounds like acetone or butanol can often dissolve both due to the presence of both polar and non-polar regions on the molecules. a compound may be able to dissolve both hexane and water, but a solvent like that would probably saturate with one or both of the compounds as opposed to being infinitely soluble in either.
Answered by Mojo - Wed Nov 7 23:36:03 2007
Q. Why do some compounds dissolve in both water and hexane? So how do you tell is a compound is going to be attracted to water or hexane or both?
Asked by I S - Wed Nov 7 23:26:09 2007 - Chemistry - 3 Answers - Comments
A. it doesnt necessarily need to be a soap or detergent, compounds like acetone or butanol can often dissolve both due to the presence of both polar and non-polar regions on the molecules. a compound may be able to dissolve both hexane and water, but a solvent like that would probably saturate with one or both of the compounds as opposed to being infinitely soluble in either.
Answered by Mojo - Wed Nov 7 23:36:03 2007
What type of intermolecular forces operate for hexane and water individually?
Q. What type of intermolecular forces operate for hexane and water individually? When they are mixed are there stronger or weaker forces operating between the two components of the mixture than within each pure liquid? And which operate for 1-butanol and water, and acetone and water.
Asked by Chelsey - Tue Feb 2 16:15:53 2010 - Chemistry - 3 Answers - Comments
A. Hexane C6H14 - has London dispersion forces Water-H2O has hydrogen bonds when hexane and water are mixed the intermolecular force is weak London dispersion forces When 1-butanol and water are mixed the intermolecular force is H-bonding( both have -OH groups) When acetone and water are mixed the intermolecular force is dipole-dipole attraction
Answered by halogen - Tue Feb 2 16:23:29 2010
Q. What type of intermolecular forces operate for hexane and water individually? When they are mixed are there stronger or weaker forces operating between the two components of the mixture than within each pure liquid? And which operate for 1-butanol and water, and acetone and water.
Asked by Chelsey - Tue Feb 2 16:15:53 2010 - Chemistry - 3 Answers - Comments
A. Hexane C6H14 - has London dispersion forces Water-H2O has hydrogen bonds when hexane and water are mixed the intermolecular force is weak London dispersion forces When 1-butanol and water are mixed the intermolecular force is H-bonding( both have -OH groups) When acetone and water are mixed the intermolecular force is dipole-dipole attraction
Answered by halogen - Tue Feb 2 16:23:29 2010
what is primarily responsible for the difference in the boiling points of hexane and octane?
Q. what is primarily responsible for the difference in the boiling points of the two liquids ( hexane and octane) ?
Asked by JY - Mon Mar 21 03:29:36 2011 - Botany - 1 Answers - Comments
A. Molecular weight. Also, think of the chains as being able to line up with each other. The longer chain gets more points of contact (if you like) than the shorter one so octane has a higher boiling point.
Answered by El Wardano - Mon Mar 21 04:14:10 2011
Q. what is primarily responsible for the difference in the boiling points of the two liquids ( hexane and octane) ?
Asked by JY - Mon Mar 21 03:29:36 2011 - Botany - 1 Answers - Comments
A. Molecular weight. Also, think of the chains as being able to line up with each other. The longer chain gets more points of contact (if you like) than the shorter one so octane has a higher boiling point.
Answered by El Wardano - Mon Mar 21 04:14:10 2011
What is the equation of hexane and benzene in baeyer's test?
Q. we pour 1 m L of hexane with 3 drops of KMn O4 and cover with cork and then shake... we do the same test with Benzene. but our assignment is about the equation.but we haven't yet discuss about equation...i hope you can help me...thank you
Asked by may ann - Fri Jan 18 23:59:52 2008 - Chemistry - 1 Answers - Comments
A. Hexane is not going to react with the oxidizing agent, KMn O4. Hexene will however to form a vicinal diol (two hydroxy substituents on adjacent carbons). This is confirmed by the loss of purple permangante color and the formation of a brown precipitate, Mn O2. Benzene however will not react with the permanganate since the resonance of the benzene ring (aromaticity, specifically) renders it more stable, and less prone to oxidation. The equation would depend on what alkene was used and the position of the double bond, but you will end up with a vicinal diol and manganese (IV) oxide.
Answered by gestralt - Sat Jan 19 20:12:05 2008
Q. we pour 1 m L of hexane with 3 drops of KMn O4 and cover with cork and then shake... we do the same test with Benzene. but our assignment is about the equation.but we haven't yet discuss about equation...i hope you can help me...thank you
Asked by may ann - Fri Jan 18 23:59:52 2008 - Chemistry - 1 Answers - Comments
A. Hexane is not going to react with the oxidizing agent, KMn O4. Hexene will however to form a vicinal diol (two hydroxy substituents on adjacent carbons). This is confirmed by the loss of purple permangante color and the formation of a brown precipitate, Mn O2. Benzene however will not react with the permanganate since the resonance of the benzene ring (aromaticity, specifically) renders it more stable, and less prone to oxidation. The equation would depend on what alkene was used and the position of the double bond, but you will end up with a vicinal diol and manganese (IV) oxide.
Answered by gestralt - Sat Jan 19 20:12:05 2008
Is mixing Iodine and Hexane a chemical change?
Q. As well as mixing iodine in water. The iodine was soluble with the Hexane and only turned purple. Couldnt that possibly be a physical change? Also, the iodine and water produced a precipitate I believe from the iodine not being soluable. Wouldnt that be chemical?
Asked by prettycool - Sat Feb 12 01:14:52 2011 - Chemistry - 1 Answers - Comments
A. its not a chemical change because these two chemical wont react. its just a solution. if you add a potasium iodide in the iodine/hexane solution you will get tri iodide. hexane provides a good condition where iodine can react with other reactants.
Answered by ozisan - Sat Feb 12 01:25:57 2011
Q. As well as mixing iodine in water. The iodine was soluble with the Hexane and only turned purple. Couldnt that possibly be a physical change? Also, the iodine and water produced a precipitate I believe from the iodine not being soluable. Wouldnt that be chemical?
Asked by prettycool - Sat Feb 12 01:14:52 2011 - Chemistry - 1 Answers - Comments
A. its not a chemical change because these two chemical wont react. its just a solution. if you add a potasium iodide in the iodine/hexane solution you will get tri iodide. hexane provides a good condition where iodine can react with other reactants.
Answered by ozisan - Sat Feb 12 01:25:57 2011
How do I know where hexane and toluene fractions are collected in a distillation?
Q. For my chem lab report, I have to graph temperature versus volume for a distillation. The question is, where on the graph would the hexane and toluene fractions be collected? I don't know. How can I tell?
Asked by Thing - Sat Feb 23 00:37:19 2008 - Chemistry - 2 Answers - Comments
A. hexane and toulene fractions come under different temperature of their boiling point!!! and the vary in volume too according to their crude feed. so using the temperature u can find the fraction!!!
Answered by sunil - Sat Feb 23 00:42:55 2008
Q. For my chem lab report, I have to graph temperature versus volume for a distillation. The question is, where on the graph would the hexane and toluene fractions be collected? I don't know. How can I tell?
Asked by Thing - Sat Feb 23 00:37:19 2008 - Chemistry - 2 Answers - Comments
A. hexane and toulene fractions come under different temperature of their boiling point!!! and the vary in volume too according to their crude feed. so using the temperature u can find the fraction!!!
Answered by sunil - Sat Feb 23 00:42:55 2008
How can you tell the difference between a bottle of hexane and a bottle of octane?
Q. They are both colorless liquids and the labels have disappeared from both.
Asked by Maggie - Wed Oct 10 00:30:38 2007 - Non-Alcoholic Drinks - 4 Answers - Comments
A. Hexane tastes sweet. Octane is kinda bitter.
Answered by aybabtu - Wed Oct 10 00:33:04 2007
Q. They are both colorless liquids and the labels have disappeared from both.
Asked by Maggie - Wed Oct 10 00:30:38 2007 - Non-Alcoholic Drinks - 4 Answers - Comments
A. Hexane tastes sweet. Octane is kinda bitter.
Answered by aybabtu - Wed Oct 10 00:33:04 2007
Asking for the balanced equation for the combustion of hexane?
Q. Write the balanced equation for the combustion of hexane and use the average bond energies listed in Table 7-1 to estimate the reaction energy (heat of combustion). Give your answer in k J/mol of hexane
Asked by Monica V - Sun May 17 14:56:24 2009 - Chemistry - 1 Answers - Comments
A. 2 C6H14 +19 O2 = 12 CO2 + 14 H2O
Answered by Dr.A - Sun May 17 15:00:05 2009
Q. Write the balanced equation for the combustion of hexane and use the average bond energies listed in Table 7-1 to estimate the reaction energy (heat of combustion). Give your answer in k J/mol of hexane
Asked by Monica V - Sun May 17 14:56:24 2009 - Chemistry - 1 Answers - Comments
A. 2 C6H14 +19 O2 = 12 CO2 + 14 H2O
Answered by Dr.A - Sun May 17 15:00:05 2009
Why does hexane behave differently then water?
Q. In class, we conducted an experiment in which plastic was rubbed against animal fur, then held next to a steady stream of water and then hexane. When it went next to the water then the water stream bent and was attracted to the plastic. The hexane was left unaffected by the plastic. I know water is polar and hexane is not. Still, how can the above be explained?
Asked by Val - Sat Feb 6 17:08:09 2010 - Chemistry - 1 Answers - Comments
A. you are pretty much on the right track... think of the structure of methane and that of water... when rubbing plastic against animal fur, you are creating an electric charge... think of it like a shock. this electric charge can be attracted to the polar water (positive at H, negative at O). kind of how water conducts electricity. hexane on the other hand, has is completely unpolar, organic molecule. it is completely unaffected by any charge nearby
Answered by marcopolo342 - Sat Feb 6 17:47:55 2010
Q. In class, we conducted an experiment in which plastic was rubbed against animal fur, then held next to a steady stream of water and then hexane. When it went next to the water then the water stream bent and was attracted to the plastic. The hexane was left unaffected by the plastic. I know water is polar and hexane is not. Still, how can the above be explained?
Asked by Val - Sat Feb 6 17:08:09 2010 - Chemistry - 1 Answers - Comments
A. you are pretty much on the right track... think of the structure of methane and that of water... when rubbing plastic against animal fur, you are creating an electric charge... think of it like a shock. this electric charge can be attracted to the polar water (positive at H, negative at O). kind of how water conducts electricity. hexane on the other hand, has is completely unpolar, organic molecule. it is completely unaffected by any charge nearby
Answered by marcopolo342 - Sat Feb 6 17:47:55 2010
What is ethanol and hexane: nonpolar or polar covalent?
Q. What is ethanol and hexane: nonpolar or polar covalent?
Asked by THat girl - Thu Dec 13 21:25:47 2007 - Chemistry - 2 Answers - Comments
A. actually ethanol and hexane while both may be considered non polar, ethanol has a polar OH group in it. The oxygen has a d- charge while the H has a d+ charge
Answered by Shivum P - Thu Dec 13 21:46:39 2007
Q. What is ethanol and hexane: nonpolar or polar covalent?
Asked by THat girl - Thu Dec 13 21:25:47 2007 - Chemistry - 2 Answers - Comments
A. actually ethanol and hexane while both may be considered non polar, ethanol has a polar OH group in it. The oxygen has a d- charge while the H has a d+ charge
Answered by Shivum P - Thu Dec 13 21:46:39 2007
What is the difference between cyclohexane and hexane?
Q. (a). Cyclohexane has one extra C-C bond and two less C-H bonds. (b).Cyclohexane has one extra C-C bond. (c). Cyclohexane has three less C-H bonds. (d).Cyclohexane has two extra C-C bond and one less C-H bonds.
Asked by daddymontreal - Tue Feb 8 04:44:16 2011 - Chemistry - 1 Answers - Comments
Q. (a). Cyclohexane has one extra C-C bond and two less C-H bonds. (b).Cyclohexane has one extra C-C bond. (c). Cyclohexane has three less C-H bonds. (d).Cyclohexane has two extra C-C bond and one less C-H bonds.
Asked by daddymontreal - Tue Feb 8 04:44:16 2011 - Chemistry - 1 Answers - Comments
From Yahoo Answer Search: 'hexane'
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Wed, 28 Jul 2010 12:28:21 GMT+00:00
lonad News 'Rose Absolute' is solvent-extracted with hexane and produces a darker oil, dark yellow to orange in colour. The weight of oil extracted is about one ...
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