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Extraction Lab Report - Sai Kottapalli

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Separation and purification extraction of an organic base (4-ethyl aminobenzoate) using an

acid (HCl)

Abstract:
The purpose of this experiment is to extract an organic base, 4-ethyl aminobenzoate,
using an acid (HCl) and naphthalene from a starting 1:1 mixture of naphthalene and 4-ethyl
aminobenzoate. The objective of the base extraction experiment was primarily achieved through
acid base reactions allowing for changes in solubility to extract the 4-ethyl aminobenzoate. The
addition of HCl protonated the base, therefore ionizing it and allowing it to be water soluble.
Consequently, the addition of NaOH deprotonates the base and returns it to its neutral form
allowing it to precipitate out and be extracted. This process led to a 113.94% recovery of 4-ethyl
aminobenzoate (the greater than 100% percent recovery could have come from excess water
weight from the base crystals being dried insufficiently) and an experimental melting point range
of 87.2-89.1 °C. In addition, naphthalene was extracted with the aid of sodium sulfate and its
strong ion dipole interactions with water. This process led to a 89.7% recovery of naphthalene
with an experimental melting point range of 78.4-80 °C.
Introduction:
Extraction is an important analytical chemistry technique based on separation and
purification of substances/chemicals in a mixture. It has many applications which outlines its
importance because it is used to separate and increase the purity of the chemicals based on
different solubilities of the parts of the mixture in the context of different solvents.

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Extraction Lab Report - Sai Kottapalli

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