Chem 3A - Acid-Base Experiment - Part KHP Unknown Each student is to determine the percent of KHP (remember the exact formula for your calculations), in his or her sample using the acid/base titration method. You will use 2.5 grams of sample each time. First weigh your flask, then the flask plus your sample, add 40 mls of DI water and the indicator, then titrate using your base to the same endpoint. Determine the moles of base used, moles of acid present, grams of acid and percent KHP (acid) in your sample. Give the percentage in 3 sig figs. Weight of flask Weight of flask plus sample Weight of sample used Initial base buret reading Final base buret reading Volume of base used Molarity of base used Moles of base used Moles of acid (KHP) Grams of KHP Percent KHP in sample Trail One 120,49 123.4 2.4 ml 0.10 ml 14.1ml 8.315 M 0.00444 0.00 944 Unknown Number Average percent KHP in sample Trail Two 120.49 124.49 2.5 m 0.13 ml 14.8 ml. 14.67m1 0.315 m 0.00462 0.00462 Trail Three 120.49 123.49 2.5 ml 0.13 ml 15,0 m/ 14.87m1 0.315 m 0.00468 0.00 468
Chem 3A - Acid-Base Experiment - Part KHP Unknown Each student is to determine the percent of KHP (remember the exact formula for your calculations), in his or her sample using the acid/base titration method. You will use 2.5 grams of sample each time. First weigh your flask, then the flask plus your sample, add 40 mls of DI water and the indicator, then titrate using your base to the same endpoint. Determine the moles of base used, moles of acid present, grams of acid and percent KHP (acid) in your sample. Give the percentage in 3 sig figs. Weight of flask Weight of flask plus sample Weight of sample used Initial base buret reading Final base buret reading Volume of base used Molarity of base used Moles of base used Moles of acid (KHP) Grams of KHP Percent KHP in sample Trail One 120,49 123.4 2.4 ml 0.10 ml 14.1ml 8.315 M 0.00444 0.00 944 Unknown Number Average percent KHP in sample Trail Two 120.49 124.49 2.5 m 0.13 ml 14.8 ml. 14.67m1 0.315 m 0.00462 0.00462 Trail Three 120.49 123.49 2.5 ml 0.13 ml 15,0 m/ 14.87m1 0.315 m 0.00468 0.00 468
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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How to solve for grams of KHP and the percent of KHP?
Transcribed Image Text:**Chem 3A – Acid – Base Experiment – Part Four: KHP Unknown**
The goal of this experiment is to determine the percent of KHP in your sample using an acid/base titration method. Each student will use 2.5 grams of their sample each time. The procedure is as follows:
1. Weigh your flask.
2. Weigh the flask plus your sample.
3. Add 40 mL of DI water and the indicator to the flask.
4. Titrate using your base to the same endpoint.
**Data Collection:**
Determine the moles of base used, moles of acid present, grams of acid, and percent KHP (acid) in your sample. Report your findings with three significant figures.
| | Trail One | Trail Two | Trail Three |
|-------------------------|-----------|-----------|-------------|
| Weight of flask | 129.4 g | 120.4 g | 120.4 g |
| Weight of flask plus sample | 123.4 g | 125.4 g | 123.4 g |
| Weight of sample used | 2.9 g | 2.5 g | 2.9 g |
| Initial base buret reading | 0.1 mL | 0.13 mL | 0.12 mL |
| Final base buret reading | 14.2 mL | 14.8 mL | 15.0 mL |
| Volume of base used | 14.1 mL | 14.7 mL | 14.8 mL |
| Molarity of base used | 0.715 M | 0.315 M | 0.315 M |
| Moles of base used | 0.01014 | 0.00462 | 0.00468 |
| Moles of acid (KHP) | 0.01014 | 0.00462 | 0.00468 |
| Grams of KHP | | | |
| Percent KHP in sample | | | |
**Additional Data:**
- Unknown Number: ________
- Average percent KHP in sample: ________
This experiment involves careful measurement and titration to accurately
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