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Can you help me with this question from organic chemistry lab? Let me give you information about the lab. separation of organic substances. A mixture
Can you help me with this question from organic chemistry lab? Let me give you information about the lab.
separation of organic substances.
A mixture of three solid organic substances is to be separated by an acidbase extraction of a
organic solution. These substances must be used:
Benzoic acid acidic compound
Nitroaniline basic compound
Naphthalene neutral
All the substances are easily soluble in organic solvents approximately in the middle of the polarity scale, but
not soluble in water. In this assignment, dichloromethane will be used as the organic phase.
Execution:
Weigh out from a finished mixture, about grams of a :: mixture of the substances mentioned above.
Record the exact weight.
Dissolve the mixture in approx. mL of dichloromethane in a beaker and transfer the solution to a
separatory funnel.
Acidic and basic components are then extracted by extracting with basic and respectively
acidic water solution use M NaOH or M HCl Neutral component remains dissolved in organic
phase.
All extractions are done times with mL portions each time. The portions are beaten
together in an a flask which is labeled with the substance it contains.
To ensure purity of the water phases, these phases must also be extracted with a little organic
solvent: take the combined acidic water phase in the separatory funnel and extract once with approx
mL of dichloromethane. This residue is transferred to the organic phase. Do the same
with the overall basic water phase. Wash the combined organic phase with clean
water at the end. All substances are now available in hopefully pure solutions.
The pH is measured in the water solutions and they are neutralized NOTEM NaOH or M HCl Precipitated
substance is filtered off with suction filtration, dried with a desiccator and weighed.
Yield must be determined by weighing the flask before and after evaporation.
Organic solution is cleaned of water residues by adding a desiccant MgSO
let the solution dry with stirring for minutes. The desiccant is then filtered off I need help with these two questions:
Which reaction occurs during extraction with alkaline water solution? Please draw the reaction equation with structural formulas and use resonance arrows. organic chemistry
What reaction occurs during extraction with an acidic water solution? draw the reaction equation with structural formulas and use resonance arrows. please draw the way its done in organic chemistry. Thank you for the help.
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