Lab on Stoichiometry

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Stoichiometry/Percent Yield Lab Purpose: to predict the amount of product generated from a double displacement reaction. In class, you have learned how to use stoichiometry to determine the amount of a product generated from a chemical reaction. We call this the theoretical yield. In this lab, sodium bicarbonate (NaHCO3, a.k.a. baking soda) will be mixed with acetic acid (HC2H3O2, a.k.a. vinegar) to generate sodium acetate (NaC2H3O2) and carbonic acid (H2CO3). The carbonic acid will rapidly decompose to generate gaseous carbon dioxide and liquid water. You will calculate your theoretical yield of NaC2H3O2 For this reaction, we will need to use 0.025 moles of NaHCO3. Procedure: 1. Calculate how many grams of sodium bicarbonate (NaHCO3) you will need to measure out to obtain 0.025 moles. Record the quantity to measure out here: ____________________ 2. Measure out the amount of NaHCO3 you calculated using a balance and a weighing paper. Attempt to get as close to your calculated amount as possible. Record this amount in your data table. 3. Weigh a clean 500 mL Erlenmeyer flask. Record this amount in your data table. 4. Dissolve the NaHCO3 in about 15 milliliters of distilled water in the 500 mL flask. Stir until it is mostly dissolved. (It is okay if some remains undissolved.) 5. Obtain approximately 75 mL of acetic acid (a.k.a. vinegar) and slowly add it in small quantities to the flask containing the sodium bicarbonate solution. Wait for the bubbling to subside between additions so that the reaction does not overflow the flask. 6. When all the acetic acid has been added, swirl flask or stir for two minutes with a glass stirring rod. 7. When the solution is completely calm, move the flask to a hot plate and heat it to boiling. Be careful that the flask does not overflow, as this will hurt your calculations. 8. When all the liquid

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