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Author Question: Complete the following equations. If no appreciable reaction occurs, write no reaction. ... (Read 143 times)

pragya sharda

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on: Aug 23, 2018
Complete the following equations. If no appreciable reaction occurs, write no reaction.
 

Question 2

The pain reliever phenacetin is soluble in cold water to the extent of 1.0 g/1310 mL and soluble
  in diethyl ether to the extent of 1.0 g/90 mL.
  (a) Determine the approximate distribution coefficient for phenacetin in these two solvents.
  (b) If 50 mg of phenacetin were dissolved in 100 mL of water, how much ether would be
  required to extract 90 of the phenacetin in a single extraction?
  (c) What percent of the phenacetin would be extracted from the aqueous solution in (b) by
  two 25-mL portions of ether?
  answers



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kardosa007

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Reply #1 on: Aug 23, 2018
Answer to Question 1

(a)
(b) no reaction
(c) no reaction
(d) CH3CH2CH2CO2 Na+ + H2O + CO2
(e) no reaction
(f) no reaction
(g) no reaction
(h) no reaction
(i) CH3N+HCH2CH2NH2+



Answer to Question 2

(a) K (ether/water) = (1.0 g/90 mL)/(1.0 g/1310 mL) = 14.6
(b) K = (0.045 g/X mL ether) / (0.05 g/100 mL water) = 14.6; X = 6.2 mL
(c) first extraction: (X/25 mL)/((50-X)/100 mL = 14.6
X = 39 mg in ether
second extraction: 9 mg in ether
Total: (39 + 9) mg = 48 mg (96)



pragya sharda

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Reply #2 on: Aug 23, 2018
Thanks


kardosa007

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Reply #3 on: Aug 23, 2018
Welcome :)


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