Experiment: Analysing molar mass of Aspirin Essay

IntroductionIn 1899 the Bayer Company of Germany introduced the ethanoate ester of salicylic vinegarish naming it, aspirin. acetylsalicylic acid is an acid, it eject be titrated with a base such as sodium hydroxide to the equating point. The following chemic equation light upon the acid-base action that will be discover in this essay.H-Aspirin + NaOH > Na-Aspirin + H2O(acid) (base) (salt)The above chemical equation is balanced as create verbally. An index finger will be theatrical roled to offer up a way to visually shape the endpoint of the titration. Phenolphthalein changes from colourless to a perish pink while bromothymol dismal changes from lily-livered to a faint blue at a pH of around 8. objectTo calculate the mill mass of AspirinHypothesisThe chemical formula of Aspirin is C9H8O4. It heap to a fault be written as C6H5(OCOCH3)COOH. In this experiment, Aspirin, which is an acid, will react with sodium hydroxide, NaOH in an acid-base reaction to cause salt and water. This analysis makes use the event that aspirin is a monoprotic acid and thus reacts with NaOH according to the equationConclusionThe observational molar mass of Aspirin, C6H5(OCOCH3)COOH is close to the hypothetic encourage. The difference among the data-based value and the accepted value is not really big. However, there are difference between the experimental molar mass of aspirin when employ phenolphthalein and bromothymol blue as index number. The obtained molar mass of aspirin when development phenolphthalein exponent is smaller than using bromothymol blue as index. The difference with the theoretical value is also less. Due to this difference, the percentage error when using phenolphthalein is smaller than bromothymol blue. Therefore, phenolphthalein is a better indicator in this acid-base titration reaction. This is because the last pH or the endpoint of titration lies in between pH range of phenolphthalein that is 8.2-10.0 and not in bromothymol blue which is 6.0-7.6 . This is the reason why phenolphthalein indicator is fitting to produce more accurate emergence than bromothymol blue.EvaluationThere are near weaknesses that were detected throughout the experiment. Firstly, the lot of indicator are not fix in this experiment. Using drops is not really adequate as it may distort the volume of indicator in this experiment. The difference may not really big scarce it still can affect the final result.Secondly, the mixture of aspirin, C6H5(OCOCH3)COOH and sodium hydroxide, NaOH is not aflame during the titration. This may produce uneven and not uniform result as the NaOH is not totally mix with the aspirin. The neutralization edge may only occur on the surface of the aspirin solution.Having said that, this experiment is successfully analyzing the molar mass of aspirin. The experimental value is close to the theoretical value. promote cleansementIn order to improve the results of the future experiments, several ways can be i mplemented. Firstly, the volume of indicator use should be fixed instead of using drops. By using this way, the level of scruple of the final results can be reduced. overly that, the mixture of aspirin solution and NaOH aim to be stirred throughout the titration process. to a greater extent uniform results can be obtained by implementing this method.