Exactly 1.50 g of an organic compound A is completely dissolved in the indicate

Question

Exactly 1.50 g of an organic compound A is completely dissolved in the indicate quantities of each one of the following (separate) solvents at 25 degree C 40.0mL of water 48.0 mL of hexane: 42.0 mL of diethyl ether Calculate the solubility or concentration of compound in g/10.0 mL of each one of the four solvents at 25 degree C. Show your calculation providing all answer in the correct numbers of significant figures and units. water hexane diethyl ether pentane Using the values determined in) above, estimate the value of the distribution or partition coefficient (K) of compound A at 25 degree C between hexane and water diethyl ether and water pentane and water Which one of the above three organic solvents would you choose to extract organic compound A from an aqueous solution? (Insert the letter corresponding to the correct choice in the adjacent blank). Hexane diethyl ether pentane

Explanation / Answer

(a) Water

40.0 mL = 1.5 g of organic compound

then, 10.0 mL of water = 10 x 1.5 / 40 = 0.375 g/10.0 mL

(b) Hexane

48.0 mL of hexane = 1.5 g. of organic compound

then, 10.0 mL of hexane = 10 x 1.5 / 48 = 0.3125 g/10 mL

(c) diethyl ether

42.0 ml of diethyl ether = 1.5 g. of organic compound

then, 10.0 mL of diethyl ether = 10 x 1.5 / 42 = 0.3571 g /10mL

(d) Pentane

36.0 mL of pentane = 1.5 g. of organic compound

then, 10.0 mL of pentane = 10 x 1.5 / 36 = 0.417 g/ 10.0 mL

Part (C) Since the organic compound is more soluble in pentane than in water, it can be extracted by using pentane.

so then answer is (c)

Part (B)

(a)

Partion coefficient = Log ([soltue]hexane/[solute]water = Log (0.3125/0.375) = - 0.0792

(b) Partion coefficient = Log ([soltue]ether/[solute]water = Log ( 0.3571/0.375) = - 0.0212

(c) Partion coefficient = Log ([soltue]pentane/[solute]water = Log ( 0.417/0.375) = 0.0461

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