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Need help with question #24  Results  Trial 1 :  Initial Volume = 0 0.5143g=KHP 14.3 = Buret Measurment    Trial 2: Initial Volume= 0  0.5615g = KHP  14.1 = Buret Measurement

Need help with question #24  Results  Trial 1 :  Initial Volume = 0 0.5143g=KHP 14.3 = Buret Measurment    Trial 2: Initial Volume= 0  0.5615g = KHP  14.1 = Buret Measurement

Chemistry
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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Need help with question #24 

Results 

Trial 1 : 

Initial Volume = 0

0.5143g=KHP

14.3 = Buret Measurment 

 

Trial 2:

Initial Volume= 0 

0.5615g = KHP 

14.1 = Buret Measurement 

**Analysis of Unknown Sample of KHP** 1. Place the pure bottle of KHP back onto the stockroom shelf for acids. 2. Drag the bottle of KHP with unknown purity onto the bottom stockroom shelf and zoom out. 3. Place the bottle of KHP with unknown purity onto the bench near the balance. 4. Drag a new clean beaker onto the bench near the balance. 5. Weigh out approximately 0.5 g of KHP with unknown purity and add it to the beaker as before. 6. Place beaker onto stir plate and add 100 mL of DI water and a few drops of phenolphthalein as before. 7. Stir the solution in the beaker. 8. Refill the buret with the now standardized Sodium Hydroxide solution. Record initial volume reading. 9. Open the stopcock so the solution from the buret is delivered in a dropwise fashion. 10. When a pink color forms, close the stopcock and record the final volume reading. 11. Dispense of the solution in the beaker and repeat the titration of KHP with unknown purity for a second trial. 12. Calculate the percent of KHP (mass of KHP in sample/total mass of sample) in the bottle of unknown purity for each trial as well as an average value and standard deviation. 13. Before quitting the program, click on the laboratory notebook. Click on practice and then report. Input values for molarity and percent KHP and click submit. Take a screenshot of the submitted laboratory notebook page that includes actual values for the molarity and percent purity.
Transcribed Image Text:**Analysis of Unknown Sample of KHP** 1. Place the pure bottle of KHP back onto the stockroom shelf for acids. 2. Drag the bottle of KHP with unknown purity onto the bottom stockroom shelf and zoom out. 3. Place the bottle of KHP with unknown purity onto the bench near the balance. 4. Drag a new clean beaker onto the bench near the balance. 5. Weigh out approximately 0.5 g of KHP with unknown purity and add it to the beaker as before. 6. Place beaker onto stir plate and add 100 mL of DI water and a few drops of phenolphthalein as before. 7. Stir the solution in the beaker. 8. Refill the buret with the now standardized Sodium Hydroxide solution. Record initial volume reading. 9. Open the stopcock so the solution from the buret is delivered in a dropwise fashion. 10. When a pink color forms, close the stopcock and record the final volume reading. 11. Dispense of the solution in the beaker and repeat the titration of KHP with unknown purity for a second trial. 12. Calculate the percent of KHP (mass of KHP in sample/total mass of sample) in the bottle of unknown purity for each trial as well as an average value and standard deviation. 13. Before quitting the program, click on the laboratory notebook. Click on practice and then report. Input values for molarity and percent KHP and click submit. Take a screenshot of the submitted laboratory notebook page that includes actual values for the molarity and percent purity.
**Title: Understanding Percent Purity in Chemistry - Educational Guide** --- **5. Percent Purity Calculation** What is meant by percent purity? If a sample of KHP has a percent purity of 40%, how many grams of KHP are in 0.965 g of the sample? --- **Procedure:** 1. Open Beyond Labz software. 2. Download and open the Chemistry Lab tab. 3. Click on the Titrations bench. --- **Standardization of NaOH Solution** 1. Click on the stockroom shelves. 2. Click on the unknowns shelf. 3. Create one unknown of Sodium Hydroxide with a concentration between 0.1000 M and 0.1200 M and another unknown of Potassium Hydrogen Phthalate (KHP) with 50.00% to 90.00% weight percent purity. 4. Return to stockroom and drag the 100% pure bottle of KHP and the unknown Sodium Hydroxide solution. 5. Return to lab. 6. Drag the unknown Sodium Hydroxide onto the bench near the buret stand and drag the pure KHP bottle onto the bench near the balance. 7. Click on the beakers drawer and drag the beaker to the bench near the bottle of KHP. 8. Click on the balance and drag a piece of weigh paper onto the pan. Tare the balance. 9. Click on the bottle cap to open the bottle of KHP. 10. Add the smallest amount of KHP onto the spatula by clicking and holding onto the top image of solid on a spatula on the bottle label. Drag over the weigh paper and let go. 11. Repeat until the mass of KHP on the weigh paper is close to 0.5 g. Record the exact mass. 12. Drag the weigh paper with solid over the beaker and let go to add the solid to the beaker. Click the top of the bottle to cap it and zoom out. 13. Drag the beaker onto the stir plate. 14. Click and drag the 50 mL graduated cylinder over to the sink to fill with DI water. 15. Drag the filled graduated cylinder over the beaker and let go to add 50 mL of water to the beaker. 16. Repeat steps 13–14 so there is a total of 100 mL in the beaker. 17. Add phenolphthalein indicator by dragging the
Transcribed Image Text:**Title: Understanding Percent Purity in Chemistry - Educational Guide** --- **5. Percent Purity Calculation** What is meant by percent purity? If a sample of KHP has a percent purity of 40%, how many grams of KHP are in 0.965 g of the sample? --- **Procedure:** 1. Open Beyond Labz software. 2. Download and open the Chemistry Lab tab. 3. Click on the Titrations bench. --- **Standardization of NaOH Solution** 1. Click on the stockroom shelves. 2. Click on the unknowns shelf. 3. Create one unknown of Sodium Hydroxide with a concentration between 0.1000 M and 0.1200 M and another unknown of Potassium Hydrogen Phthalate (KHP) with 50.00% to 90.00% weight percent purity. 4. Return to stockroom and drag the 100% pure bottle of KHP and the unknown Sodium Hydroxide solution. 5. Return to lab. 6. Drag the unknown Sodium Hydroxide onto the bench near the buret stand and drag the pure KHP bottle onto the bench near the balance. 7. Click on the beakers drawer and drag the beaker to the bench near the bottle of KHP. 8. Click on the balance and drag a piece of weigh paper onto the pan. Tare the balance. 9. Click on the bottle cap to open the bottle of KHP. 10. Add the smallest amount of KHP onto the spatula by clicking and holding onto the top image of solid on a spatula on the bottle label. Drag over the weigh paper and let go. 11. Repeat until the mass of KHP on the weigh paper is close to 0.5 g. Record the exact mass. 12. Drag the weigh paper with solid over the beaker and let go to add the solid to the beaker. Click the top of the bottle to cap it and zoom out. 13. Drag the beaker onto the stir plate. 14. Click and drag the 50 mL graduated cylinder over to the sink to fill with DI water. 15. Drag the filled graduated cylinder over the beaker and let go to add 50 mL of water to the beaker. 16. Repeat steps 13–14 so there is a total of 100 mL in the beaker. 17. Add phenolphthalein indicator by dragging the
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