Quick Review of Experiment

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.

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.

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

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

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.

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

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

HOW DO WE IDENTIFY THE GAS????

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

Flame & glowing splint tests to identify a gas: