Theoretical Mass of Ethyl-p Aminohenzoic Acid | Experiment

Theoretical Mass of Ethyl-p Aminohenzoic Acid ExperimentThe soften obtained through this try is 63 of the theoretical mass of ethyl-p aminohenzoic irate. There are few events that could be better in order to issue the amount of fruit obtained. First of all, the quality of re operator used is relatively lower-ranking to acquire a good percentage of the product. In order for a greater percentage yield to be attainted this audition, a great amount of reagent should be used. Beside s, that the product is transferred into too many containers repeatedly. This causes a wooly-minded in product between the transfers. Therefore, fewer transfer of product should be done in this experiment to obtain higher percentage of yield. Moreover,. Even though it was only a small portion, it is still pass the amount of purified yield obtained.. Furthermore, more precautions should be taken while performing recrystallization such as adding as little m fermentation alcohol as possible. The yield can be improved by maximizing the organic law of crystals. More crystals can be form by scratching the bottom of the Erlenmeyer flask with a drinking glass rod and adding a crystals seed into the etymon. To add on, it should be given enough time for crystals to be imbed while the flask is placed in the ice water bath. Through this, more yields can be acquired.What is the advantage of using absolute ethanol rather than using 95% ethanol in this experiment?If the 95% ethanol was used the little amount of water present in the diluted ethanol can prevent ester formation. This is because easter the comportment of water could drive the reception to the left. i.e. instead of virulentulateds becoming esters from the alkyl radical group, the esters can become acids because of the hydrogen from the water. Therefore, the use of absolute ethanol is preferred which will drive the reaction to right, rather than using any forms of diluted ethanol that could only negatively influence reactio n for ester formation. wherefore it is great to add the sulfuric acid drop wise to the ethanolic solution of p-aminobenzoic acid?Sulfuric acid has been proven to be the most efficient catalyst for esterification. Water is a product of the esterification reaction, where increase in water quantity would the reverse reaction and decrease the yield of the reaction. But when the reaction is performed in the presence of a concentrated sulfuric acid (hydrophyllic), it will perform as a dehydration agent that will absorb the water molecules by rised from the reaction. So in the presence of a sulfuric acid catalyst, the reaction will be driven towards the right side, which is preferable to yield more ester.The reason for adding this concentric acid in drop wise is mainly to avoid the extreme reaction of the acid with the water. Because, if inordinate water was produced from the ethanolic solution of p-aminobenzoic acid, the sudden addition of large quantity of concentrated sulfuric acid could operate to extreme reaction with this excessive water, and result to a large amount of heat(exothermic). This is not safe and poisonous in particular due to the use of concentrated sulphuric acid. In contrast, if acid was added as drops, the reaction will be still happening in the solution though will be bind only to a smaller extent. Therefore such procedure is preferable to maintain better control. other advantage of using drop wise adding of the acid would permit us to control the acidity of the final examination resultant. Because, if the acid content is increased in the final solution the subsequent neutralization process happens in the presence of an alkaline would lead to an extreme reaction. Therefore adding drop wise acid is essential to control the acidity of the solution, so the stability of the reaction can be maintained through go forth.The structure of the solid formed when the concentrated sulphuric acid is added to the solution of p-aminobenzoic acidFisch er esterification mechanismWhy it is important that all of the solids decide during the reflux period for a good yield of product?The solid precipitate after chill down could be unreached benzoic acid. i.e, not all the solvents are participated in the reaction to produce Benzocaine. This could happen if the amount of the ethanol is too low. But most of occasions this will be mainly due to the lack reaction between the available methanol. This can be however avoided by soul-stirring the mixture to swift the reaction. and then, in order to get good yield of ester, all the precipitants of the mixture become to be dissolved in the first place. However, this is not possible in most of the occasions.Why is it important to neutralize the reaction mixture during the work-upWhen acid is added to the reaction mixture after refluxing, the amino group is protonated, make it soluble in water. When the Na2CO3 is added, the proton is removed and makes the benzocaine is no longer soluble. Thus it begins to precipitate out of solution when the reaction mixture is neutralized. Thus it is important neutralize the moisture in order to filter out the ester from the mixture, which otherwise will be in a dissolved state hence would not be recoverable.Assuming it was necessary to add an additional portion of concentrated sulfuric acid, calculate about how some(prenominal) 10% aqueous sodium carbonate would be required to neutralize the reaction mixture.While the experiment 28.6 ml of sodium carbonate need to neutralized the 18M sulfuric acid.So the add of the other potion 0.5 ml of sulfuric acidWhat is the gas evolved during the neutralization?In presence of sulfuric acid p-amino benzoic acid reacts with ethanol to form ethyl p-aminobenzoate. The reaction medium contains the sulfuric acid and this was neutralized with sodium bicarbonate. Thus the gas evolved during the reaction between the acid and base is carbon dioxide (CO2).