Decomposition of Baking Soda

Name:______Period:______Decomposition of Baking Soda Purpose: To determine the possible decomposition reactions of sodium bicarbonate (commonly called baking soda). Baking soda is used to prepare cakes in order to insure that cakes "rise" as they bake. The three possible decomposition reactions theoretically possible are: (only one reaction actually occurs) 1. sodium bicarbonate(s) sodium hydroxide(s) + carbon dioxide(g) 2. sodium bicarbonate(s) sodium oxide(s) + carbon dioxide(g) + water(g) 3. sodium bicarbonate(s) sodium carbonate(s) + carbon dioxide(g) + water(g) Procedures: 1. Measure the mass of the empty crucible and record (1). 2. Place the empty crucible on the balance pan, press tare (zero), add a baking soda (≈ 5g) and record (2). 3. Set up the ring stand with clay triangle. Heat 10 minutes. Use a stirring rod to carefully break up any "clumps" that form. Cool (≈ 5 minutes). Measure the mass of crucible and final product and record (3) 4. Write and balance the 3 possible reactions. 5. Use the mass of the baking soda from procedure #2 to calculate grams of solid product formed in each of the 3 reactions. Compare to your experimental value of product formed to determine which reaction actually took place! Data Table: 1. Mass of crucible_____ 2. Mass of baking soda____ 3. Mass of crucible and product_____ Calculations: (LABEL and SHOW ALL WORK) Mass of product= mass of crucible and product – mass of crucible Balanced Equations 1. 2. 3. Mass to mass stoichiometry calculations 1.

Conclusion: Which reaction happened? How do you know? (Compare your experimental value of product formed to your three answers above.)

Decomposition of Baking Soda Purpose: To determine the possible decomposition reactions of sodium bicarbonate (commonly called baking soda). Baking soda is used to prepare cakes in order to insure that cakes "rise" as they bake. The three possible decomposition reactions theoretically possible are: (only one reaction actually occurs) 4. sodium bicarbonate(s) sodium hydroxide(s) + carbon dioxide(g) 5. sodium bicarbonate(s) sodium oxide(s) + carbon dioxide(g) + water(g) 6. sodium bicarbonate(s) sodium carbonate(s) + carbon dioxide(g) + water(g) Procedures: 1. Measure the mass of the empty crucible and record (1). 2. Place the empty crucible on the balance pan, press tare (zero), add a baking soda (≈ 5g) and record (2). 3. Set up the ring stand with clay triangle. Heat 10 minutes. Use a stirring rod to carefully break up any "clumps" that form. Cool (≈ 5 minutes). Measure the mass of crucible and final product and record (3) 4. Write and balance the 3 possible reactions. 5. Use the mass of the baking soda from procedure #2 to calculate grams of solid product formed in each of the 3 reactions. Compare to your experimental value of product formed to determine which reaction actually took place! Data Table: 4. Mass of crucible_____ 5. Mass of baking soda____ 6. Mass of crucible and product_____ Calculations: (LABEL and SHOW ALL WORK) Mass of product= mass of crucible and product – mass of crucible Balanced Equations 1. 2. 3. Mass to mass stoichiometry calculations 1.

Conclusion: Which reaction happened? How do you know? (Compare your experimental value of product formed to your three answers above.)