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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 entitiesIntroduction Acidbase extraction involves carrying out simple acidbase 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 pages3 Separation of Carboxylic Acid a Phenol and a Neutral Substance The purpose of this acidbase extraction is to separate a mixture ofequal parts ofbenzoic acidstrong acid and 2-naphthanolweak base and14-dimethoxybenzeneneutral by extracting from tert-butylmethyl etherveryvolatileThe goal of this experiment was to identify the three components in the mixtureand to determine the percent recovery of each from the mixture4 Separation of a Neutral and Basic Substance A mixture of equal parts of a neutral substance containing eithernaphthalene 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 determinationResultsProcedure Observations InferenceDissolve 305g Phenol Mixture was a golden-Neutral acid in 30ml brownyellow colort-butyl methyl ether inErlenmeyer flask and transfermixture to 125ml separatoryfunnel using little ether tocomplete the transferAdd 10 ml of water Organic layermixtureaqueous layerwaterclearAdd 10 ml saturated aqueous Sodiumbicarbonate NaHCO3 dissolves insolution sodium bicarbonatewaterto funnel and mix cautiouslywith stopper onVent liberated carbon Carbon dioxide gasdioxide and shake the mixture was released three timesthoroughly with frequent venting of the funnelAllow layers to separate Layer H2O NaHCO3completely and draw offlower layer into 50ml Erlenmeyerflask 1Add 10ml of 15 aqueous NaOH Flask 2 H2O NaHCO35ml of 3M and 5ml H2O toseparatory funnel shake mixture allow layers to separate and drawoff lower layer into a 25ml Erlenmeyer flask 2 Add additional5ml of water to funnel shake as beforeAdd 15
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