How do i collect oxygen produced in a reaction?
1. Obtain the following equipment: • A 250-mL Erlenmeyer flask • The “two-hole stopper + thistle tube + glass tubing + rubber tubing” apparatus • Five wide mouth ‘gas-collecting’ bottles • Four glass ‘cover’ plates • A pneumatic trough filled with water to ½ inch above the metal shelf 2. Fill four of the five wide-mouth bottles to the brim with water (the fifth will be used later). Then gently slide a glass plate over the mouth of each bottle. Make sure that there are no air bubbles at the top of the glass plate. 3. While holding the glass plate with your fore and middle finger, gently invert a bottle and lower it into the water in the pneumatic trough. Remove the glass plate when the mouth of the bottle is below the water level in the pneumatic trough. Repeat this for all four bottles. Place the glass plates aside on a paper towel, as they will be used later. 4. Place one gas-collecting bottle on the metal shelf. Make sure that the mouth of the bottle does not come out of the water. 5
