AP Chemistry
3.10 Solubility
3.7 Solutions and Mixtures
3.1 Intermolecular and Interparticle Forces
A student investigates how each of the following solutes partitions between equal-volume layers of water, \(\text{H}_2\text{O}\), and hexane, \(\text{C}_6\text{H}_{14}\), at \(25^\circ\text{C}\).
The concentrations are low enough that aggregation of the solute particles can be neglected. After each mixture reaches equilibrium, the student defines the distribution ratio as
\[ D=\dfrac{c_{\mathrm{water}}}{c_{\mathrm{hexane}}} \]
where each concentration represents the total dissolved solute in that layer. Compared with \(D\) for dodecanoic acid, which prediction for \(D\) for sodium dodecanoate is best supported?
| Trial | Solute |
|---|---|
| Acid | Dodecanoic acid, \(\text{CH}_3(\text{CH}_2)_{10}\text{COOH}\) |
| Salt | Sodium dodecanoate, composed of \(\text{Na}^{+}\) and \(\text{CH}_3(\text{CH}_2)_{10}\text{COO}^{-}\) |
The concentrations are low enough that aggregation of the solute particles can be neglected. After each mixture reaches equilibrium, the student defines the distribution ratio as
\[ D=\dfrac{c_{\mathrm{water}}}{c_{\mathrm{hexane}}} \]
where each concentration represents the total dissolved solute in that layer. Compared with \(D\) for dodecanoic acid, which prediction for \(D\) for sodium dodecanoate is best supported?
Similar Questions
Tools for a 5
AP aligned mock tests to help you get a 5.
With grading, adaptive explanations, and more.
Find a Quiz
Find, solve, and grade every AP FRQ ever.
Find an FRQ
Stuck on AP Chemistry? Get unstuck with an AP specialist.1 to 1 tutors who know the exam inside out. Understand weeks of material in a single session.Book a SessionSee all our elite tutors
Learn AP Physics from scratch, quickly. This is the only course you'll need for the year.
A self-paced course with everything you need to get a 5. Trusted by over 15,000 students and 200+ schools. Learn fast, or we'll refund your purchase, backed by our 100% satisfaction guarantee.
Explore the Course