Return to Blog
Homepage
MCAT Chemistry Question — Dilution Equation
- by
- Nov 07, 2014
- MCAT Blog, MCAT Chemistry, MCAT Question of the Day
A student prepares a ten liter solution of 0.01M NaOH by starting with 25mL of a stock solution. What is the concentration of the stock solution?
A) 0.1 M
B) 0.4 M
C) 2.5 M
D) 4.0 M
Explanation
The student is only adding water when doing the dilution. Thus moles i = moles f. Because M = mol / volume, you can substitute M x V for moles. Thus the dilution equation is:
M1V1 = M2V2
Plugging in the values given, we get:
(0.01M)(10L) = (0.025L) x M2
0.1 moles = 0.025 L x M2
0.1 / 0.025 = M2
100 / 25 = M2
4 = M2
Therefore, (D) is the answer.
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 Advisor 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