Which of the following correctly lists the reagents in terms of increasing pKa?
A) Nitric Acid, Acetic Acid, Calcium Hydroxide
B) Calcium Hydroxide, Acetic Acid, Nitric Acid
C) Acetic Acid, Nitric Acid, Calcium Hydroxide
D) Calcium Hydroxide, Nitric Acid, Acetic Acid
Explanation
The reagents listed are all common ones that the MCAT will expect you to be familiar with:
Nitric Acid: HNO3, strong acid, pKa = -1.4
Acetic Acid: CH3COOH, weak acid, pKa = 4.76
Calcium Hydroxide: Ca(OH)2, strong base, pKa = 12.4
Acid strength correlates with pKa, so choice (A) is correct.
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.