Acid Base Extraction Essay

1356 words - 5 pages

The purpose of this laboratory assignment was two-fold, first, we were todemonstrate the extraction of acids and bases, finally, determining what unknowns werepresent. Second, we were to extract caffeine from tea. These two assignment will bedocumented in two separate entities.Introduction: Acid/base extraction involves carrying out simple acid/base reactions inorder to separate strong organic acids, weak organic acids neutral organic compoundsand basic organic substances. The procedure for this laboratory assignment are on thefollowing pages.3) Separation of Carboxylic Acid, a Phenol and a Neutral SubstanceThe purpose of this acid/base extraction is to separate a mixture of equal parts ofbenzoic acid(strong acid) and 2-naphthanol(weak base) and1,4-dimethoxybenzene(neutral) by extracting from tert-butylmethyl ether(veryvolatile).The goal of this experiment was to identify the three components in the mixtureand to determine 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 either naphthalene orbenzoin and a basic substance containing either 4-chloroaniline or ethyl 4-aminobenzoatewere to be separated by extraction from an ether solution. Once the separation tookplace, and crystallization was carried out, it became possible to determine whatcomponents were in the unknown mixture, by means of a melting point determination.ResultsProcedure Observations InferenceDissolve 3.05g Phenol Mixture was a golden-Neutral acid in 30ml brown/yellow colort-butyl methyl ether inErlenmeyer flask and transfermixture to 125ml separatoryfunnel using little ether tocomplete the transferAdd 10 ml of water Organic layer=mixtureaqueous layer=water(clear)Add 10 ml saturated aqueous Sodium bicarbonate NaHCO3 dissolves insolution sodium bicarbonate funnel and mix cautiouslywith stopper onVent liberated carbon Carbon dioxide gasdioxide and shake the mixture was released three timesthoroughly with frequent ventingof the funnelAllow layers to separate Layer = H2O +NaHCO3completely and draw offlower layer into 50ml Erlenmeyerflask 1Add 10ml of 1.5 aqueous NaOH Flask 2 = H2O + NaHCO3(5ml of 3M and 5ml H2O) toseparatory funnel, shake mixture,allow layers to separate and drawoff lower layer into a 25mlErlenmeyer flask 2. Add additional5ml of water to funnel, shake as beforeAdd 15 ml NaCl to funnel. Shake Bottom layer is white and NaCl was added tothe mixture and allow layers to separate gooey. wash the etherand draw off lower layer, which is layer and to removediscarded organic substancesNaOH and NaHCO3Pour ether layer into 50mlErlenmeyer flask from the topof the separatory funnel(not allowing any waterdroplets to be transferred)Flask 3Add anhydrous NaSO4to ether extract until it nolonger clumps togetherand set it asideAcidify contents of flask 2 Litmus went from Acidification was nowby dropwise addition of blue to pink. Flask completeconcentrated HCl while 2 = creamy...

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