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How do I get the mass of Cu, g produced?

How do I get the mass of Cu, g produced?

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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How do I get the mass of Cu, g produced?

**Laboratory Procedure: Copper and Zinc Reaction and Filtration** 1. **Obtain and Prepare Zinc:** - Obtain a flat piece of clean zinc (Zn), determine its mass, and record it. Ensure any plastic cover is removed before weighing. The mass should be between 1.5 and 2.0 grams. 2. **Add Zinc to Solution:** - Using forceps or crucible tongs, pick up the Zn piece and carefully add it to a beaker at a 45-degree angle. Release it slowly to avoid splashing. 3. **Stirring and Reaction:** - Continuously scrape the Zn surface with a glass-stirring rod to ensure freshly formed solid copper (Cu) adheres to the surface. 4. **Allow Reaction to Complete:** - Let the reaction proceed until the blue color of the solution disappears (10-15 minutes). Add 5-10 drops of 10% hydrochloric acid to remove fine Cu particles and facilitate filtration. 5. **Remove Excess Zinc:** - Using tongs, remove remaining Zn and transfer it to a 50 mL beaker containing 5-7 mL of distilled water. Clean adhering Cu and repeat as needed. Determine residual Zn weight. 6. **Discard Residual Zinc:** - Place Zn in the container labeled "Discarded Zn Residue." 7. **Decant the Solution:** - Carefully decant the supernatant liquid (aqueous solution) from solid Cu into a beaker without losing any metal. Discard in the labeled container "Discarded Zn Solutions." 8. **Set Up Vacuum Filtration Apparatus:** - Refer to Figure 5.1 for setup instructions, if not already done. 9. **Prepare Filter Paper:** - Place a circular filter paper in the Büchner funnel and moisten it with distilled water. Ensure there is a seal between the paper and funnel. 10. **Filtration:** - Add 10 mL distilled water to the reaction beaker and transfer to the Büchner funnel. Use a wash bottle to remove Cu specks until all are transferred. 11. **Operate the Filtration:** - Place the large beaker in the sink under the aspirator. Turn on the aspirator and press the funnel onto the flask for a good vacuum. Stirring rod may help ensure water passage. 12. **Wash the Copper:
Transcribed Image Text:**Laboratory Procedure: Copper and Zinc Reaction and Filtration** 1. **Obtain and Prepare Zinc:** - Obtain a flat piece of clean zinc (Zn), determine its mass, and record it. Ensure any plastic cover is removed before weighing. The mass should be between 1.5 and 2.0 grams. 2. **Add Zinc to Solution:** - Using forceps or crucible tongs, pick up the Zn piece and carefully add it to a beaker at a 45-degree angle. Release it slowly to avoid splashing. 3. **Stirring and Reaction:** - Continuously scrape the Zn surface with a glass-stirring rod to ensure freshly formed solid copper (Cu) adheres to the surface. 4. **Allow Reaction to Complete:** - Let the reaction proceed until the blue color of the solution disappears (10-15 minutes). Add 5-10 drops of 10% hydrochloric acid to remove fine Cu particles and facilitate filtration. 5. **Remove Excess Zinc:** - Using tongs, remove remaining Zn and transfer it to a 50 mL beaker containing 5-7 mL of distilled water. Clean adhering Cu and repeat as needed. Determine residual Zn weight. 6. **Discard Residual Zinc:** - Place Zn in the container labeled "Discarded Zn Residue." 7. **Decant the Solution:** - Carefully decant the supernatant liquid (aqueous solution) from solid Cu into a beaker without losing any metal. Discard in the labeled container "Discarded Zn Solutions." 8. **Set Up Vacuum Filtration Apparatus:** - Refer to Figure 5.1 for setup instructions, if not already done. 9. **Prepare Filter Paper:** - Place a circular filter paper in the Büchner funnel and moisten it with distilled water. Ensure there is a seal between the paper and funnel. 10. **Filtration:** - Add 10 mL distilled water to the reaction beaker and transfer to the Büchner funnel. Use a wash bottle to remove Cu specks until all are transferred. 11. **Operate the Filtration:** - Place the large beaker in the sink under the aspirator. Turn on the aspirator and press the funnel onto the flask for a good vacuum. Stirring rod may help ensure water passage. 12. **Wash the Copper:
**Section:** Chem 1063-07 **Data:** - **Mass of copper chloride in 25.0 mL of solution:** 2.021 g - **Initial mass of Zn:** 1.636 g - **Mass of Zn after reaction:** 0.685 g - **Mass of Zn reacted:** 0.951 g (calculated as 1.636 g - 0.685 g) - **Mass of filter paper:** 0.298 g - **Mass of wax paper + Cu\(_g\):** 0.816 g - **Mass of wax paper + Cu after 5 min. on Büchner funnel:** 0.816 g - **After additional 5 min. on bench:** 0.814 g - **After another 5 min. on bench:** 0.804 g - **Glass dish:** 50.572 g **Calculation:** - **Mass of Cu produced:** (To be calculated) - **Mass of Cl in copper chloride:** (To be calculated) - **Moles of Cu in copper chloride (mol):** (To be calculated) - **Moles of Cl in copper chloride (mol):** (To be calculated) **Empirical Formula:** - (To be determined) --- **Graph/Diagram Explanation:** There are no graphs or diagrams included in the image.
Transcribed Image Text:**Section:** Chem 1063-07 **Data:** - **Mass of copper chloride in 25.0 mL of solution:** 2.021 g - **Initial mass of Zn:** 1.636 g - **Mass of Zn after reaction:** 0.685 g - **Mass of Zn reacted:** 0.951 g (calculated as 1.636 g - 0.685 g) - **Mass of filter paper:** 0.298 g - **Mass of wax paper + Cu\(_g\):** 0.816 g - **Mass of wax paper + Cu after 5 min. on Büchner funnel:** 0.816 g - **After additional 5 min. on bench:** 0.814 g - **After another 5 min. on bench:** 0.804 g - **Glass dish:** 50.572 g **Calculation:** - **Mass of Cu produced:** (To be calculated) - **Mass of Cl in copper chloride:** (To be calculated) - **Moles of Cu in copper chloride (mol):** (To be calculated) - **Moles of Cl in copper chloride (mol):** (To be calculated) **Empirical Formula:** - (To be determined) --- **Graph/Diagram Explanation:** There are no graphs or diagrams included in the image.
Expert Solution
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Mass of copper(Cu) produced is equal to the mass of the last weighed amount of copper that is within 0.05 g range of the previously weighed mass. 

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