Benzoic acid

You will compare the melting point of this impure sample to the benzoic acid recovered from recrystallization. The name was derived from gum benzoin.

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You will also determine the recovery for the recrystallization you carry out.

. To demonstrate benzoic acid was refluxed in ethanol along with concentrated sulfuric acid in order to form ethyl benzoate Figure 456ab. A TLC plate of the reaction mixture at 1 hour of reflux showed residual unreacted carboxylic acid Figure 456c which is not uncommon due to the energetics of the reaction. It was first prepared from coal tar.

It is white and belongs to the family of carboxylic acid. It is used in various ways like manufacturing of insect repellents below are some uses of benzoic acid. Like other peroxyacids it may be used to generate epoxides such as styrene oxide from styrene.

The goal of this weeks lab is to recrystallize the benzoic acid you isolated last week. Calculate the volume of boiling water needed to dissolve 10 g of benzoic acid. Any of various typically water-soluble and sour compounds that in solution are capable of reacting with a base to form a salt redden litmus and have a pH less than 7 that are hydrogen-containing molecules or ions able to give up a proton to a base or that are substances able to accept an unshared pair of electrons from a base.

Benzoic acid C 7 H 6 O 2 was first described in the 16 th century. A Refluxing reagents b. It is a crystalline organic compound.

Of or relating to one of three possible isomers of a benzene ring with two attached chemical groups in which the carbon atoms with attached groups are separated by two unsubstituted carbon atoms. The meaning of ACID is a sour substance. Explain why a Büchner or Hirsh funnel is used to isolate the final crystallized product instead of stem funnel.

1 Set a small amount of the impure benzoic acid aside and keep it until next week. It is the simplest aryl peroxy acidIt may be synthesized from benzoic acid and hydrogen peroxide or by the treatment of benzoyl peroxide with sodium methoxide followed by acidification. In asymmetrical acid anhydrides where two different carboxylic acids were used to give the anhydride for example the dehydration between benzoic acid and propanoic acid C 6 H 5 COOH CH 3 CH 2 COOH C 6 H 5 COOCO CH 2 CH 3 H 2 O the prefixes from both acids reacted are listed before the suffix in this case giving benzoic propanoic anhydride which may.

Peroxybenzoic acid is an organic compound with the formula C 6 H 5 CO 3 H. Using the solubility data you found for benzoic acid calculate the volume of water required to dissolve 10 g of benzoic acid at room temperature.

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