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Chem 105 Online Post Laboratory Questions: Boo 20550 ante 1. What is the purpose of rinsing the precipitate at the end of the reaction? How would your calculation for percent yield be affected if this were not rinsed thoroughly? OBJECT In t

Chem 105 Online Post Laboratory Questions: Boo 20550 ante 1. What is the purpose of rinsing the precipitate at the end of the reaction? How would your calculation for percent yield be affected if this were not rinsed thoroughly? OBJECT In t

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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of prelab (see tion. You may also I solution stays in overfill the has a uniform umber 2 of prelab ed cylinder. tion. You may also solution stays in overfill the as a uniform mass for the second 0.250M CaCl2 into a graduated measuring a new 1. The mixture will This Photo by Unknown Author is licensed un pernatant until it is passes. itate a few times Ditate. This ensures Chem 105 Online that all the spectator ions are rinsed off the filter paper and precipitate and not recrystallize-which would add an additional mass on the filter paper when dried. 7. Carefully remove the filter paper (it will still be very moist) and place it on a paper towel to dry overnight. a. If you are cramped for time, an oven will work set at 200-225°F. Set the wet filter paper on a baking sheet and place in the oven. Check it regularly to not burn the filter paper. b. A sunny window is a happy medium for wet filter paper as well. Ⓒ 8. Repeat the process one more time for a second trial. This time you will measure 10.0mL of 0.750M Na2CO3 and 50.0mL of 0.250M CaCl₂ into a new plastic cup.. Don't forget your documentation! Data Table Data Entry Quantities Used Theoretical Yield of Precipitate (record here, show calculations below table) Mass of Filter Paper BEFORE experiment Mass of DRY Filter Poper and Precipitate (day 2) Mass of Calcium Carbonate (Precipitate, day 2) Percent Yield Trial 2 Trial 1 30.0mL of 0.250M CaCl₂ 15.0mL of 0.750M Na2CO3 .53g Trial 2 50.0mL of 0.250M CaCl2 10.0mL of 0.750M Na2CO3 .53g Calculations For each trial, show the theoretical yield of Calcium Carbonate produced based on your limiting reactant and amounts of each reactant used. Trial 1 Cat Naz
Transcribed Image Text:of prelab (see tion. You may also I solution stays in overfill the has a uniform umber 2 of prelab ed cylinder. tion. You may also solution stays in overfill the as a uniform mass for the second 0.250M CaCl2 into a graduated measuring a new 1. The mixture will This Photo by Unknown Author is licensed un pernatant until it is passes. itate a few times Ditate. This ensures Chem 105 Online that all the spectator ions are rinsed off the filter paper and precipitate and not recrystallize-which would add an additional mass on the filter paper when dried. 7. Carefully remove the filter paper (it will still be very moist) and place it on a paper towel to dry overnight. a. If you are cramped for time, an oven will work set at 200-225°F. Set the wet filter paper on a baking sheet and place in the oven. Check it regularly to not burn the filter paper. b. A sunny window is a happy medium for wet filter paper as well. Ⓒ 8. Repeat the process one more time for a second trial. This time you will measure 10.0mL of 0.750M Na2CO3 and 50.0mL of 0.250M CaCl₂ into a new plastic cup.. Don't forget your documentation! Data Table Data Entry Quantities Used Theoretical Yield of Precipitate (record here, show calculations below table) Mass of Filter Paper BEFORE experiment Mass of DRY Filter Poper and Precipitate (day 2) Mass of Calcium Carbonate (Precipitate, day 2) Percent Yield Trial 2 Trial 1 30.0mL of 0.250M CaCl₂ 15.0mL of 0.750M Na2CO3 .53g Trial 2 50.0mL of 0.250M CaCl2 10.0mL of 0.750M Na2CO3 .53g Calculations For each trial, show the theoretical yield of Calcium Carbonate produced based on your limiting reactant and amounts of each reactant used. Trial 1 Cat Naz
3 C Chem 105 Online Post Laboratory Questions: broshan 1. What is the purpose of rinsing the precipitate at the end of the reaction? How would your calculation for percent yield be affected if this were not rinsed thoroughly? 2. Suppose a student introduces an object to aid in stirring the solution but does not rinse the object and places it directly on their countertop. They notice a white powder that resides on the stirrer. How will their calculation for percent error be affected? Explain. The percent error would be incorrect because we wouldn't 3. Why must the filter paper be dried before obtaining the final mass? 4. Would you classify this process as an effective method to form Calcium Carbonate? What are the limitations of the experiment if it were to be done on a commercial level? What changes would you make if you needed to perform this in a commercial setting? Chem 10 OBJECT In t СОГ CO BACKG Che On mc Spe ter me ab Ta CO C Er te W I (
Transcribed Image Text:3 C Chem 105 Online Post Laboratory Questions: broshan 1. What is the purpose of rinsing the precipitate at the end of the reaction? How would your calculation for percent yield be affected if this were not rinsed thoroughly? 2. Suppose a student introduces an object to aid in stirring the solution but does not rinse the object and places it directly on their countertop. They notice a white powder that resides on the stirrer. How will their calculation for percent error be affected? Explain. The percent error would be incorrect because we wouldn't 3. Why must the filter paper be dried before obtaining the final mass? 4. Would you classify this process as an effective method to form Calcium Carbonate? What are the limitations of the experiment if it were to be done on a commercial level? What changes would you make if you needed to perform this in a commercial setting? Chem 10 OBJECT In t СОГ CO BACKG Che On mc Spe ter me ab Ta CO C Er te W I (
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Precipitation is the technique which involves formation of a solid substance in a solution by means of a chemical process.

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