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1. A lone pair on oxygen of water attacks a carbon in acetic anhydride, forcing one of the bonds in the carbonyl group (of acetic anhydride) to move onto its oxygen (oxygen of carbonyl group). The oxygen now has a negative charge and water is attached to the carbon that was once doubly bonded to oxygen. The water now has a positive charge, making it an oxonium ion.
2. The lone pair of electrons on the negatively charged oxygen (of the former carbonyl group) moves back down, forming a double bond again with carbon.
3. Carbon now has a negative charge so it has to get rid of it by breaking its bond with oxygen (the one in the middle of the anhydride). You now have 2 molecules.
4. The positive charge of water has to also go away so it loses a hydrogen. You now have one molecule of acetic acid.
5. The hydrogen attaches onto the oxygen that was broken away from carbon (but still attached to the carbonyl group of the other untouched carbon). And you now have your second molecule of acetic acid.
So for every mole of acetic anhydride and water, you form 2 moles of acetic acid.
It may be hard to understand this but i have a link for you if you are still confused.
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What does a anhydride look like?
Acetic anhydride has a very simple appearance that looks very similar to water. It is clear and appears completely colorless.
How do you get Acetic anhydride?
As an anhydride, It can be prepared by dehydrating its acid, i.e. Acetic acid, by strong dessicant such as Tetraphosphorus decaoxide(P4O10) :P4O10 + 12 CH3COOH ----> 4 H3PO4 + 6(CH3CO)2O
Why is acetic anhydride used in the preparation of perchloric acid?
acetyl chloride and acetic anhydride are more preferred as acetylating agents because they show great reactivity and produced irreversible reactions in the preparation of other acid derivatives. They can serve as intermediates in the conversation of the less reactive carboxylic acids to more reactive classes of compounds.
What reaction would occur if toulene were not completely dry in a reaction between maleic anhydride and dimethylbutadiene?
I'm doing the same problem..are u in my chm206 lab? lol anyway..maleic anhydride reacts with water from the toluene to form maleic acid.
Difference between 0.1 M acetic acid and glacial acetic acid?
Glacial acetic acid doesn't have water in it. Acetic acid ordinarily would be in a solution. Acetic acid is a weak acid, but it can be very concentrated. Glacial acetic acid is a acetic acid of a high purity more then 99.75 %
In the preparation of aspirin water is added to the reaction flask Why?
The formation of aspirin will proceed faster if acetic anhydride is used in place of acetic acid. However, acetic anhydride will hydrolyze in the presence of water to form acetic acid, slowing down the reaction.
In the aspirin synthesis excess acetic anhydride is hydrolyzed by the addition of water which converts the anhydride into acetic acid Write the balanced equation for this reaction?
The reaction is: (CH3CO)2O + H2O = 2 CH3COOH
What does a anhydride look like?
Acetic anhydride has a very simple appearance that looks very similar to water. It is clear and appears completely colorless.
How do you get Acetic anhydride?
As an anhydride, It can be prepared by dehydrating its acid, i.e. Acetic acid, by strong dessicant such as Tetraphosphorus decaoxide(P4O10) :P4O10 + 12 CH3COOH ----> 4 H3PO4 + 6(CH3CO)2O
Why is acetic anhydride used in the preparation of perchloric acid?
acetyl chloride and acetic anhydride are more preferred as acetylating agents because they show great reactivity and produced irreversible reactions in the preparation of other acid derivatives. They can serve as intermediates in the conversation of the less reactive carboxylic acids to more reactive classes of compounds.
What is the mechanism involved in Liebermann- Burchard test?
When conc. sulfuric acid is added to cholesterol, a water molecule is removed from C3 of cholesterol molecule, and it is oxidised to form3,5-cholestadiene.This product is converted to a polymer containing a chromophore which results in the green colouration indicating a positive test.
What reaction would occur if toulene were not completely dry in a reaction between maleic anhydride and dimethylbutadiene?
I'm doing the same problem..are u in my chm206 lab? lol anyway..maleic anhydride reacts with water from the toluene to form maleic acid.
Difference between 0.1 M acetic acid and glacial acetic acid?
Glacial acetic acid doesn't have water in it. Acetic acid ordinarily would be in a solution. Acetic acid is a weak acid, but it can be very concentrated. Glacial acetic acid is a acetic acid of a high purity more then 99.75 %
How is a 0.1n solution of perchloric acid prepared?
pipette out 8.5 ml perchloric acid in to 500 ml acetic acid and add 21 ml of acetic anhydride make up to volume to 1000 ml with acetic acid*. * Let this solution stand for one day and check the water content
What is an example of a chemical reaction that occurs quickly?
Ex.: burning of methane, reaction of calcium carbonate with acetic acid, reaction of sodium with water.
What is an anhydride?
An anhydride is a compound formally derived from another by the loss of a water molecule.
Why is paracetamol insoluble in acetic acid?
Paracetamol is produced by reaction of an acetic compound and another compound. So, it already contains an acetic acid molecule. Therefore the 2 molecules cannot recombine unless forced to under reaction circumstances. Also, acetic acid cannot dissolve into water and form an azeotrope
