Acid Base Extraction Essay

1356 words - 5 pages

Acid Base Extraction

The purpose of this laboratory assignment was two-fold, first, we were to
demonstrate the extraction of acids and bases, finally, determining what
unknowns were present. Second, we were to extract caffeine from tea. These two
assignment will be documented in two separate entities.

Introduction: Acid/base extraction involves carrying out simple acid/base
reactions in order to separate strong organic acids, weak organic acids neutral
organic compounds and basic organic substances. The procedure for this
laboratory assignment are on the following pages.

3) Separation of Carboxylic Acid, a Phenol and a Neutral Substance

     The purpose of this acid/base extraction is to separate a mixture of
equal parts of benzoic acid(strong acid) and 2-naphthanol(weak base) and 1,4-
dimethoxybenzene(neutral) by extracting from tert-butylmethyl ether(very
volatile).The goal of this experiment was to identify the three components in
the mixture and to determine the percent recovery of each from the mixture.

4) Separation of a Neutral and Basic Substance

     A mixture of equal parts of a neutral substance containing either
naphthalene or benzoin and a basic substance containing either 4-chloroaniline
or ethyl 4-aminobenzoate were to be separated by extraction from an ether
solution. Once the separation took place, and crystallization was carried out,
it became possible to determine what components were in the unknown mixture, by
means of a melting point determination.


Procedure Observations

Dissolve 3.05g Phenol Mixture was a golden-Neutral acid
in 30ml brown/yellow color t-butyl methyl ether in
Erlenmeyer flask and transfer mixture to 125ml separatory funnel using little
ether to complete the transfer

Add 10 ml of water               Organic layer=mixture
                         aqueous layer=water(clear)

Add 10 ml saturated aqueous           Sodium bicarbonate          NaHCO3
dissolves in solution sodium bicarbonate                    
     water. to funnel and mix cautiously with stopper on

Vent liberated carbon               Carbon dioxide gas dioxide and shake the
mixture     was released three times thoroughly with frequent venting of the

Allow layers to separate          Layer = H2O +NaHCO3 completely and draw
off lower layer into 50ml Erlenmeyer flask 1

Add 10ml of 1.5 aqueous...

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