Question

Using your notetbook (which should have any equaitons/tables/ vital information) answer the questions below. Showing ALL math when needed. (20 pts) 1. The pain reliever phenacetin is soluble in cold water to an extent of 1.0 g/1310 ml and soluble in diethyl ether to an exient of 1.0 g/90ml. Determine the approximate distribution coefficient for phenacetin in those two solvents. (6 pts) 2. Why must the stopper be removed from the separatory funnel before the lower layer is removed? (4 pts) 3. Student during an extraction experiment lost track of which layer is the aqueous layer. How could a student determine which layer is which by a simple test? (4 pts) 4. The distribution coefficient, K, 10 for compound Y. What weight of compound Y would be removed from a solution of 4.0 g of Y in 100 ml water by a single extraction with 100 ml of ether? (6 pts)

Answer 1

the formula of the distribution coeficient

K_D = Concentration_organic / Concentration_aqueous

K_D = (Y_organic / Volume_organic) / (Y_aqueous / Volume_aqueous)

the mass in organic phase is an unknown number ''w''

the mass in the aqueous phase is 4 - w

volume is 100 ml in both cases

the equation to solve is :

10 = (w/100) / ((4-w)/100)

if we arrange the equation we get

10(4-w) =w

40 = 11w

w = 3.6363 grams

that's the amount of Y extracted

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