Question
Volhard’s method of performing this technique involves first mixing excess silver nitrate with a saline solution. For 10 points each:
[10e] Name this technique to determine the concentration of an analyte. The “acid-base” form of this technique involves slowly adding an acid or base to a solution until an indicator changes color.
ANSWER: titration [accept acid-base titration]
[10h] At this point in an acid-base titration, the pH and pKa of the solution are equal, meaning the concentration of the weak acid equals the concentration of the conjugate base.
ANSWER: half-equivalence point [reject “equivalence (point)”]
[10m] In the Volhard method, silver chloride undergoes this process by settling out of solution to indicate the equivalence point. Compounds with a low Ksp (“K-s-p”) more easily undergo this process.
ANSWER: precipitation [accept word forms like precipitate]
<Chemistry>
Summary
| 2024 ACF Fall at Cornell | fall | Y | 1 | 10.00 | 100% | 0% | 0% |
| 2024 ACF Fall at Ohio State | fall | Y | 9 | 13.33 | 89% | 44% | 0% |
| 2024 ACF Fall at Washington | fall | Y | 7 | 15.71 | 100% | 57% | 0% |
| 2024 ACF Fall at Georgia | fall | Y | 12 | 18.33 | 100% | 75% | 8% |
| 2024 ACF Fall at North Carolina | fall | Y | 10 | 16.00 | 90% | 70% | 0% |
| 2024 ACF Fall at Rutgers | fall | Y | 8 | 16.25 | 100% | 63% | 0% |
| 2024 ACF Fall at Illinois | fall | Y | 9 | 21.11 | 100% | 78% | 33% |
Data
| Tusculum | Appalachian State A | 10 | 0 | 10 | 20 |
| Appalachian State B | UNC D | 10 | 0 | 10 | 20 |
| Duke A | Duke B | 10 | 0 | 10 | 20 |
| Virginia | James Madison A | 10 | 0 | 0 | 10 |
| James Madison B | Liberty C | 0 | 0 | 0 | 0 |
| NC State | VCU | 10 | 0 | 10 | 20 |
| Virginia Tech A | UNC A | 10 | 0 | 10 | 20 |
| UNC B | Liberty B | 10 | 0 | 0 | 10 |
| Liberty A | UNC C | 10 | 0 | 10 | 20 |
| Virginia Tech B | William & Mary | 10 | 0 | 10 | 20 |