CHE 111 Molar Volume of a Gas.pdf - The Molar Volume of a...

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Chapter 5 / Exercise 28
Chemical Principles
DeCoste/Zumdahl
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The Molar Volume of a Gas 1 In this experiment, you will determine the molar volume of a gas by conducting a chemical reaction that produces a gas, as shown in the reaction equation below. Mg(s) + 2HCl(aq) MgCl 2 (aq) + H 2 (g) You will react a known mass of solid magnesium with an excess of hydrochloric acid, in a sealed vessel, and use the pressure change to calculate molar volume at STP. OBJECTIVES In this experiment, you will 1. Measure the amount of gas produced in a chemical reaction using the pressure change. 2. Determine the volume of gas produced in the chemical reaction. 3. Determine the molar volume of the gas produced in the reaction. 4. Calculate the molar volume of a gas at STP. MATERIALS Vernier computer interface magnesium ribbon, pre-cut Computer 3.0 M HCl solution Vernier Gas Pressure Sensor small beaker for HCl solution Temperature Probe Analytical (digital) balance 600 mL or one liter beaker 125 mL Erlenmeyer flask 10 mL graduated cylinder Syringe PROCEDURE Mg is the limiting reactant. The number of moles of H 2 expected ( n ) can be calculated using the balanced chemical reaction and mole ratio. The H 2 gas produced in the flask increases the pressure by P ( the experiment is done under constant-volume and constant-temperature conditions ; Assume that H 2 is an Ideal Gas and that the observed increase in pressure in the experiment is due entirely to generation of H 2 gas ). You are however interested in finding the volume occupied by H 2 ( V ) produced under constant-pressure and constant-temperature conditions, so that the molar volume can be calculated. 1. Start the Logger Pro program on your computer. Open the file “Molar Volume of a Gas” (File under: Advanced Chemistry with Vernier, 05MolarVolume.cmbl ) 2. Connect a Gas Pressure Sensor to Channel 1 of the Vernier computer interface. Connect a Temperature Probe into Channel 2 of the interface. Connect the interface to the computer with the proper cable. 3. Obtain and wear goggles. 4. Obtain a 125 mL Erlenmeyer flask. Measure the volume of gas the flask will hold when set up in the manner described for the experiment.. Remember: a. A 125 mL flask does not have a volume of exactly 125 mL. b. During the experiment, you will seal the flask with a rubber stopper and the stopper will occupy some of the volume of the flask. c. You will add 5 mL of solution (3M HCl solution) to the flask. Look at Figure 1 and the answer to Pre-Lab question 1 . Record this value in your data table 5. Prepare a room temperature water bath in a large beaker. The bath should be deep enough to completely cover the gas level in the Erlenmeyer flask. (see Figure 1)
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Chapter 5 / Exercise 28
Chemical Principles
DeCoste/Zumdahl
Expert Verified
2 6. Obtain a piece of magnesium ribbon ( pre-cut OR about 1 to 1.5 inch long ). Weigh the piece of

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