Acid Base Extraction Essay -- essays research papers

Acid Base ExtractionThe social function of this laboratory assignment was two-fold, first, we were to border the declivity of acids and smalls, finally, determining whatunknowns were present. Second, we were to extract caffeine from tea. These twoassignment will be documented in two separate entities.Introduction Acid/base extraction involves carrying out simple acid/basereactions in order to separate strong organic acids, weak organic acids neutralorganic compounds and primary organic substances. The procedure for thislaboratory assignment are on the following pages.3) Separation of Carboxylic Acid, a Phenol and a Neutral SubstanceThe purpose of this acid/base extraction is to separate a confection ofequal parts of benzoic acid(strong acid) and 2-naphthanol(weak base) and 1,4-dimethoxybenzene(neutral) by extracting from tert-butylmethyl ether(veryvolatile).The goal of this experiment was to identify the three components inthe mixture and to determine the percent recovery of ea ch from the mixture.4) Separation of a Neutral and Basic SubstanceA mixture of equal parts of a neutral substance containing eithernaphthalene or benzoin and a basic substance containing either 4-chloroanilineor ethyl 4-aminobenzoate were to be separated by extraction from an ethersolution. Once the separation took place, and crystallization was carried out,it became possible to determine what components were in the unknown mixture, bymeans of a melting purport determination.ResultsProcedure Observations deductionDissolve 3.05g Phenol Mixture was a golden-Neutral acidin 30ml brown/yellow color t-butyl methyl ether inErlenmeyer flask and transfer mixture to 125ml separatory funnel using littleether to complete the transferAdd 10 ml of waterOrganic seam=mixtureaqueous layer=water(clear)Add 10 ml saturated aqueous Sodium bicarbonateNaHCO3dissolves in solution sodium bicarbonate... ...spCaffeinesalicylate is a Pasteur pipette temporary hookup theisolated(white color)formed. beaker i s in the ice bath then vacuum filter.Caffeine beaker51.61g -51.56g.05g = 50mg% yield = .05g x 100% = 20% .25gCaffeine salicylate17.198g -17.036g .062g% yield = .062g x 100% = 25% .25gConclusionAccording to the HPLC graph that follows, my product was very pure. Theactual melting point of caffeine salicylate is 137 degree(C), my product wasfound to have a melting point of 138 degrees (C). As before, of course thisexperiment was not done completely error-free, the error is due almost entirelyon human error.