In order to extract isobutyric acid from a solution of diethly ether, one should wash the solution with:
a) 1 30mL wash of water
b) 3 10mL washes of water
c) 1 30mL wash of hexane
d) 3 10mL washes of hexane
Explanation
Isobutyric acid has a carboxylic acid group, is polar, and can readily hydrogen bond. It can be extracted from the organic solvent, diethly ether, by washing with water. Multiple smaller volume washer extract better than one large volume wash. Use of a second organic solvent, hexane, will not extract the isobutyric acid from the diethyl ether.
a) 1 30mL wash of water, incorrect, Multiple smaller volume washes will yield higher extraction results.
b) 3 10mL washes of water, correct, Isobutyric acid will enter the aqueous layer and wash off of the organic layer of diethyl ether.
c) 1 30mL wash of hexane, incorrect, Hexane is another organic solvent like diethyl ether.
d) 3 10mL washes of hexane, incorrect, See c).
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Related Posts
Search the Blog
Free Consultation
Interested in our Online MCAT Course, One-on-One MCAT Tutoring or Med admissions packages? Set up a free consultation with one of our experienced Senior Student Advisors.
Schedule NowPopular Posts
-
-
MCAT Blog What's on the MCAT? -
-
-
MCAT Blog How to Review MCAT Full Lengths
Free MCAT Practice Account
Need great MCAT practice?Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.
Learn More