March 29, 2024, 05:15:16 AM
Forum Rules: Read This Before Posting


Topic: Can someone please help me with a question for my lab?  (Read 4220 times)

0 Members and 1 Guest are viewing this topic.

Offline sasha.w

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +0/-0
Can someone please help me with a question for my lab?
« on: May 22, 2017, 04:34:19 PM »
Synthesis of n-Propyl Propanoate - we distilled/refluxed

Use a graduated cylinder to add the
following pure liquids to a 200 mL distillation
flask:
 19.0 mL of n-propanol (0.25 mol)
 18.5 mL of propanoic acid (0.25 mol)
 Carefully add 5 drops of concentrated sulfuric acid and 2-4 boiling chips.



My questions:

What would the % yield of ester be if the reaction were simply allowed to equilibrate (i.e. no products are removed)
?


Compare your experimental % yield of n-propyl propanoate to the predicted equilibrium yield. Were you successful in driving the reaction to the right?


My data:

weight of product= 24.39g
volume of water collected=5.2ml

My calculation of the percent yield=

24.39/4.50 (mass of water) = 5.41% yield of the ester

Online Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27633
  • Mole Snacks: +1799/-410
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Can someone please help me with a question for my lab?
« Reply #1 on: May 22, 2017, 05:37:33 PM »
What would the % yield of ester be if the reaction were simply allowed to equilibrate (i.e. no products are removed)

No way to answer that question without knowing equilibrium constant.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info

Offline sasha.w

  • New Member
  • **
  • Posts: 5
  • Mole Snacks: +0/-0
Re: Can someone please help me with a question for my lab?
« Reply #2 on: May 23, 2017, 10:16:02 AM »
Sorry about that  ;DI've attached the first page of the lab manual because I couldn't copy and paste it.

Sponsored Links