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Lab 38

Lab 38. The Ideal Gas Constant. Pre-Lab. Read the Introduction and Procedure sections of the Lab. Answer all questions in the Pre-Lab Discussion except for #2. Procedure Changes :. #2. Mg ribbon should be no longer than 2.6cm! Record the length of Mg in the data table to 2 decimals.

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Lab 38

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  1. Lab 38 The Ideal Gas Constant

  2. Pre-Lab • Read the Introduction and Procedure sections of the Lab. • Answer all questions in the Pre-Lab Discussion except for #2.

  3. Procedure Changes: • #2. Mg ribbon should be no longer than 2.6cm! Record the length of Mg in the data table to 2 decimals. • #3. The mass of 100.0cm of Mg = 1.7196g • #4. Use a string to hold the Mg ribbon instead of the copper wire. • #6. Fill a 2L bottle (not a 400ml beaker)3/4 full of water • #7. Measure 5-10mL of 3.0M HCl(not 3mL) using a 10.0mL graduated cylinder. Carefully pour the HCl into a eudiometer tube (not a graduated cylinder) • #8. Gently fill the eudiometer with water by pouring it down the side. • #9. Insert stopper with Mg into eudiometer. Invert the eudiometer into the 2L bottle. • #12. Record Temperature of water in bottle when reaction stops • #13. Record Barometer Reading • #14 Recordvolume of gas collected. Make sure water levels are the same inside and outside the cylinder.

  4. Calculations: • 1. Calc. moles of Mg reacted: • 2. Write balanced equation: Mg(s) + HCl(aq) → ? • 3. Determine the moles of H2 produced:

  5. Calculations Continued • 4. Determine the value of P: Pressure of H2 = barometer – vapor pressure water Convert answer to atm’s!!!! (760mm = 1 atm) • 5.Determine the value of V: Convert mL of gas collected to L • 6. Determine the value of T: Convert °C to Kelvin • 7. Calculate R: Solve PV = nRT for R,

  6. Critical Thinking Questions: • Page 207 Analysis and C0nclusions skip #3 • Page 208 Applications skip #2 and #4 • Do not do Going Further

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