Lab Stoichiometry

Topics: Chemical reaction, Stoichiometry, Hydrochloric acid Pages: 3 (671 words) Published: March 3, 2013
John Smith
Stoichiometry Relationships in Reactions Lab
Purpose: To compare the experimental mass of a product of a chemical reaction with the mass predicted for that product by calculation. Materials:
* Balance
* Evaporating Dish
* Pipette
* Iron Ring
* Scoopula
* Goggles
* Apron
* Burner
* Ring Stand
* Watch glass
* Wire Gauze
* Test Tube
* 6M HCl
Important Info: The reaction you will be working with is that of sodium bicarbonate (NaHCO ) reacting with hydrochloric acid (HCl) to produce sodium chloride, carbon dioxide, and water. Procedure:

1. Find the combined mass of the evaporating dish and watch glass; record this mass in Data Table Entry 1. 2. Add 2.50 grams of NaHCO to the evaporating dish. Record this mass in Data Table Entry 2. 3. Set up the heating apparatus as usual. DO NOT LIGHT THE BUNSEN BURNER. Place evaporating dish on top of wire gauze. And the watch glass on top of the dish, curved side down. 4. Obtain approximately 5mL of 6M HCl in a clean dry test tube. Using the pipette slowly add the HCl to the evaporating dish. You may have to slightly lift the watch glass in order to insert the pipette. Add a few drops at a time. Continue to add the acid in this manner until the reaction (bubbling) has stopped. Carefully tilt the evaporating dish back and forth a couple of times to make sure that the acid has contacted all of the NaHCO . 5. Remove the watch glass from the evaporating dish and place it curve side up on the lab top. Now light the Bunsen burner. Holding the bottom of the burner in your hand, gently heat the evaporating dish. Use a low flame and move the burner back and forth to avoid spattering. When almost all of the liquid has evaporated, remove the burner and place the watch glass on the evaporating dish (curved side down) leaving a small opening for the vapor to escape, heat gently until no liquid remains. (HINT: When all the...
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