Acid Base Extraction Essay -- essays research papers

Acid Base ExtractionThe purpose of this science lab assignment was devil-fold, first, we were todemonstrate the extraction of pane of glasss and floorings, finally, determining whatunknowns were present. Second, we were to extract caffeine from tea. These twoassignment will be documented in two take away entities.Introduction Acid/base extraction involves carrying out simple bitter/basereactions in order to separate strong organic acids, creaky organic acids neutralorganic compounds and elemental organic substances. The procedure for this science laboratory assignment are on the following pages.3) Separation of Carboxylic Acid, a Phenol and a apathetic SubstanceThe purpose of this acid/base extraction is to separate a concoction 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 mark the percent recovery of each 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 stay determination.ResultsProcedure ObservationsInferenceDissolve 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 water ingrained layer=mixtureaqueous layer=water(clear)Add 10 ml saturated aqueous Sodium bicarbonateNaHCO3dissolves in solution atomic number 11 bicarbonate... ...spCaffeinesalicylate is a Pasteur pipette while theisolate d(white color)formed. beaker is in the chalk bath then vacuum filter.Caffeine beaker51.61g -51.56g.05g = 50mg% yield = .05g x speed of light% = 20% .25gCaffeine salicylate17.198g -17.036g .062g% yield = .062g x 100% = 25% .25g resultAccording to the HPLC graph that follows, my product was very pure. Theactual melting localize of caffeine salicylate is 137 degree(C), my product wasfound to have a melting stratum of 138 degrees (C). As before, of course thisexperiment was not done completely demerit-free, the error is due almost entirelyon human error.