Lab 2 Results (2)

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Jan 9, 2024

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Name: Student ID: Date: Lab 2 Results Conservation of Mass Record the uncertainties for which blanks are provided. Thereafter, we will assume that the uncertainties are the same for the rest of the values that are measured with that particular device. This will save a lot of tedium. Part 1: Copper(II) Ions and Glucose 1. Mass of container and cap, g 74.99 ± 0.1 2. Mass of paper, g 2.14 3. Mass of glucose tablet pieces, g 3.97 4. Mass of sodium carbonate, g 1.99 5. Mass of sodium citrate, g 3.50 6. Mass of copper(II) sulfate pentahydrate, g 0.37 7. Mass of container, cap, and contents before adding glucose burrito, g 120.83 8. Mass of water in container (Line 7 minus Lines 1, 4, 5, and 6), g 39.98 9. Total mass of container, cap, and contents after the reaction, g 126.91 Evidence that a chemical reaction has occurred: Glucose gets converted into gluconic acid Predicted mass of container and contents after the reaction according to the law of conservation of mass (add Lines 1, 2, 3, 4, 5, 6, and 8), g 126.94 Measured mass of container, cap, and contents (Line 9 above), g 126.91 According to your results, does the law of conservation of mass appear to be valid? Use the guideline of agreement within ± 0.20 g, as in Lab Exercise 1B. If the masses above are within ± 0.20 g, we will assume that the law is valid. Explain. The law appears valid because the masses are within 0.20g Part 2: Vinegar and Lye 1. Mass of container, cap, and vinegar, g 116.33 2. Mass of container and cap, g 76.01

3. Mass of vinegar, g 40.32 4. Mass of paper, g 2.21 5. Mass of paper and lye, g 3.53 6. Mass of lye, g 1.32 7. Total mass of container, cap, and contents after the reaction, g 119.85 Evidence that a chemical reaction has occurred: Heat was created Predicted mass of container and contents according to the law of conservation of mass (add Line 1 and Line 5), g 119.86 Measured mass of container, cap, and contents (Line 7 above), g 119.85 According to your results, does the law of conservation of mass appear to be valid? Use the guideline of agreement within ± 0.20 g, as in Lab Exercise 1B. If the masses above are within ± 0.20 g, we will assume that the law is valid. Explain. The law is valid because the masses are within 0.20g Part 3: Vinegar and Baking Soda, Round 1 1. Mass of container, cap, and vinegar, g 115.33 2. Mass of container and cap, g 75.36 3. Mass of vinegar, g 39,97 4. Mass of paper, g 2.11 5. Mass of paper and baking soda, g 4.93 6. Mass of baking soda, g 2.82 7. Total mass of container, cap, and contents, g 120.20 Evidence that a chemical reaction has occurred: Gas was produced Predicted mass of container and contents according to the law of conservation of mass (add Line 1 and Line 5), g 120.26 Measured mass of container, cap, and contents (Line 7 above), g 120.20

According to your results, does the law of conservation of mass appear to be valid? Use the guideline of agreement within ± 0.20 g, as in Lab Exercise 1B. If the masses above are within ± 0.20 g, we will assume that the law is valid. Explain. The law is valid because the masses are within 0.20g Part 4: Vinegar and Baking Soda, Round 2 1. Mass of container and vinegar, g 115.08 2. Mass of container, g 75.48 3. Mass of vinegar, g 40.32 4. Mass of paper, g 2,13 5. Mass of paper and baking soda, g 4.9 6. Mass of baking soda, g 2.77 7. Total mass of container and contents after the reaction, g 119.98 Evidence that a chemical reaction has occurred: Gas was produced Predicted mass of container and contents according to the law of conservation of mass (add Line 1 and Line 5), g 115.32 Measured mass of container and contents (Line 7 above), g 119.98 According to your results, does the law of conservation of mass appear to be valid? Use the guideline of agreement within ± 0.20 g, as in Lab Exercise 1B. If the masses above are within ± 0.20 g, we will assume that the law is valid. Explain. The law is not valid because the masses are within 0.20g Questions 1. The law of conservation of mass should not appear to be valid in part 4. Why not? Because I didn't screw the cap on and the gasses escaped

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2. Suppose that in Part 2 the vinegar, which contains an acid, reacts with the container, but not enough to put a hole in it. Would this ruin our attempts to investigate the Law of Conservation of Mass? Explain. Yes becaause the container would mix with the contents