Experimental Procedure, Part A.3b. Explain how a water-filled graduated cylinder

Question

Experimental Procedure, Part A.3b. Explain how a water-filled graduated cylinder is inverted in a pan of water. a. b. Experimental Procedure, Part A4. What is the proper procedure for inserting a piece of glass tubing into a rubber stopper? 4. Experimental Procedure, Part C 1. How is the volume of the congo collected (over water) measured in this experiment? 5. A thermometer is not present in the space (or volume in which the colg iscollected in this experiment. a. How then is une temperature of the Cor(g)determined in this experiment? b. The mass of a gas is elusive. How is the mass of the co (g) collected over water determined in this experiment? Experiment 13 185

Explanation / Answer

3 (a) The gas pushes the water down (as gases are relatively insoluble in water) and out of the water-filled gas-collecting vessel. The gas-collecting vessel (generally a flask or test tube) is first filled with water, covered with a glass plate or plastic wrap (make sure no air bubbles must enter the vessel), and then inverted into a deep pan or tray half-filled with water. The glass plate or plastic wrap is removed.

(b) Inserting a tubing into a rubber stopper

First lubricate the end of the glass tubing with a few drops of water, washing-up liquid, glycerol, or vegetable oil and protect your hands with work gloves or pieces of cloth. Then hold the glass tubing close to where it enters the hole in the rubber stopper. Ease the tubing into the hole with a gentle twisting motion. Push the tubing through the hole as far as is required. Do not use force!

Caution: Avoid cuts from other sources by discarding chipped and cracked glassware

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