Demonstration: Decomposition Reaction using Sodium Bicarbonate

Materials Needed

• Sodium bicarbonate
• Test tube
• Test tube clamp
• Bunsen burner
• Wood splint
• Water source (sink)

Procedure

1. Prepare the Test Tube

   • Place a small amount of sodium bicarbonate in the test tube, about 2 cm high.
   • Fasten the test tube using a test tube clamp at a 30-degree angle, facing a wall.
   • Ensure the setup allows the Bunsen burner to fit underneath the test tube.

2. Safety Precautions

   • Make sure the test tube is not pointed at anyone.

3. Conduct the Reaction

   • Turn on the gas line and light the Bunsen burner.
   • Carefully position the Bunsen burner under the test tube.

4. Observation

   • Look for any changes appearing on the walls of the test tube.

5. Test for Carbon Dioxide (CO2)

   • Light a wood splint.
   • Insert the lit wood splint into the open end of the test tube.
   • If the flame goes out, CO2 presence is confirmed.

6. Cleanup Procedure

   • Wash the test tube in the sink for the next group.
   • Run water over the used wood splint before disposal.

Key Points

• The test tube must be heated by the Bunsen burner for testing CO2 efficiently.
• Safety is crucial; always ensure proper handling and positioning of the test tube and burner.