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In a liquid-liquid extraction, the first liquid added was 30mL of 0.20M NaOH wit

ID: 228074 • Letter: I

Question

In a liquid-liquid extraction, the first liquid added was 30mL of 0.20M NaOH with Thymolphalein Indicator (blue color). Then, 30mL of 0.25M of Cinnamic Acid in Ethyl Acetate was added. These two immiscible liquids formed two layers when added together.

Using the table of dielectric constants provided, explain why the organic layer containing the cinnamic acid and the aqueous layer containing NaOH separate before the extraction in the separatory funnel.

Common Organic Solvents: Table of Properties solubility Dielectric in water (g/100g) Constant 34 point boiling melting density Solvent formula point 1.0446 Miscible 94.70.7845 Miscible 43.8 0.7857 Miscible acetic acid acetone acetonitrile benzene 1-butanol 2-butanol 2-butanone t-butyl alcohol carbon tetrachloride chlorobenzene chlorofom cyclohexane 1.2-dichloroethane diethylene glycol diethyl ether diglyme (diethylene glycol dimethyl ether) 1,2-dimethoxy- ethane (glyme, DME) dimethv C2H402 60.052 118 58.079 56.05 41.052 81.65 6.20 C3H6O C2H3N 0.8765 -88.60.8095 -88.5 0.8063 0.7999 74.12117.7 74.12 99.5 72.11 74.1282.4 153.82 76.8 112.56 131.7 119.38 61.2 15 C4HgO 86.6 12.5 2.24 0.7887 Miscible CC14 C6HsCl CHC13 0.08 1.594 1.1058 1.4788 0.7739 1.245 1.1197 0.795 0.0055 0.861 -63.4 12 2.02 98.96 83.5 106.12 246 74.12 34.5 134.17 162 C2H4Cl2 13 116.2 0.713 4.267 C6H1403 C4H1002 C3H7NO 0.943 Miscible 7.23 -69.2 0.8637 Miscible 73.09 -60.48 0.9445 Miscible 38.25 formamide (DMF) dimethyl sulfoxide (DMSO) 1.4-dioxane 189 95 88.11 101.1 1.033 Miscible 2.21(25) 12

Explanation / Answer

from the data,

ethyl acetate has solubility in aqueous=8.7g/100 g water

&dielectric constant=6

water has a dielectric constant= 78.54

Dielectric constant of a liquid is the measure of the polar nature or polarity of the liquid.Highly polar liquids have a high value of dielectric constant.,the ability to discharge/stabilize electric charges

Thus, water has very high relative polarity than that of ethyl acetate ,so they separate out immediately ,forming two different layers and cinnamic acid (non-polar ) remains dissolved in ethyl acetate.

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