All questions
AP Chemistry
8.9 Henderson-Hasselbalch Equation
8.8 Properties of Buffers
8.5 Acid-Base Titrations
8.3 Weak Acid and Base Equilibria
AdvancedMCQGraphicalConceptual17.8k
A titration graph plotting \(\text{pH}\) on the vertical y-axis (scale \(0\) to \(14\), gridlines every \(2\) units) versus Volume of \(0.100\text{ M }\text{NaOH}\) added (\(\text{mL}\)) on the horizontal x-axis (scale \(0\) to \(60\), gridlines every \(10\text{ mL}\)). A legend in the upper left indicates: solid line = Acid 1, dashed line = Acid 2. Curve 1 (solid line) starts at \(\text{pH} = 2.5\) at \(0\text{ mL}\), shows a buffer plateau at \(\text{pH} = 3.8\) at \(12.5\text{ mL}\), a first inflection at \(25.0\text{ mL}\) (\(\text{pH} = 6.0\)), a second buffer plateau at \(\text{pH} = 8.2\) at \(37.5\text{ mL}\), a second inflection at \(50.0\text{ mL}\) (\(\text{pH} = 10.0\)), and levels off at \(\text{pH} = 12.5\). Curve 2 (dashed line) starts at \(\text{pH} = 0.7\) at \(0\text{ mL}\), rises smoothly below \(\text{pH} = 2.0\) until \(45\text{ mL}\), undergoes a single steep inflection at \(50.0\text{ mL}\) through \(\text{pH} = 7.0\), and merges with Curve 1. No other curves, points, labels, or annotations appear.
Titration curves for \(25.0\text{ mL}\) samples of two \(0.100\text{ M}\) diprotic acids titrated with \(0.100\text{ M }\text{NaOH}\).
A student titrates separate \(25.0\text{ mL}\) samples of two different \(0.100\text{ M}\) diprotic acids, Acid 1 (\(\text{H}_2\text{A}\)) and Acid 2 (\(\text{H}_2\text{B}\)), with a standardized \(0.100\text{ M }\text{NaOH(aq)}\) solution at \(298\text{ K}\). The resulting titration curves are shown in the graph below.

Which of the following statements correctly explains the differences in the shapes of the two curves and the number of equivalence points observed?

Log In to Continue

Accounts are free! Log in to try this question, see explanations, save progress, and more!

Similar Questions

Tools for a 5

The Quiz Lab library of AP Physics quizzes 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.Find a Tutor 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