1. Quick Review of Experiment

2. Today’s Objectives
Students will conduct an experiment to collect and identify a gas.
Students will identify and conduct proper lab safety.
Students will properly set up apparatus to collect a gas.
Students will identify all reactions as physical or chemical and support their decision with evidence.
Students will identify the gas produced by experimental results.

3. Sodium Bicarbonate solution and Calcium Chloride solution
NaHCO3 + CaCl2
Sodium Bicarbonate solution and Calcium Chloride solution
Purpose: To determine if the reaction is a chemical or physical reaction. To identify an unknown gas.

4. Materials: Ring Stand with clamp NaHCO3 CaCl2 Water Bucket
Large test tube w/ stopper
Small test tube w/stopper
Rubber tubing
Glass elbow
2 drops of phenolphthalein
Glass stirring rod
Metal spatula
(2) Beakers or Erlenmeyer flasks
Wood Splint
Graduated Cylinder

5. 1. Add 20 mL of water into flask A 2. Add 1 drop of Phenolphthalein
Procedure:
1. Add 20 mL of water into flask A
2. Add 1 drop of Phenolphthalein
Add 60 mL of water into flask B. + +
5 mL of CaCl2
5mL of NaHCO3

6. Set up gas capturing apparatus as shown in the diagram
Set up gas capturing apparatus as shown in the diagram. Have teacher check.__________
Of the solution you made in beaker B Add 10 mL of the NaHCO3 solution to the large test tube in the ring stand.

7. Add 10 mL of the solution from beaker A (CaCl2) to the large test tube and immediately stopper test tube.

8. Place test tube full of gas into the Clamp in the test tube holder
1. Allow the liquid in the large test tube to settle for several minutes.
2. Stopper the inverted test tube in the bucket and remove. Be careful not to lose any of the gas.
Place test tube full of gas into the Clamp in the test tube holder

9. HOW DO WE IDENTIFY THE GAS????

10. 1. Use tongs to hold splint 2. I will ignite wood splint
Steps for flame test:
1. Use tongs to hold splint
2. I will ignite wood splint
3. Carefully put flame into test tube
4. Record Observations
Flame
Steps for glowing splint test :
Extinguish flame if necessary
Carefully put glowing splint into test tube
Record Observations 10

11. Flame & glowing splint tests to identify a gas: