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Determining Molar Mass of Magnesium

Conduct an experiment to determine the molar mass of magnesium using gas evolution. Follow precise steps to measure gas volume and solution levels, while considering temperature and pressure factors. Referencing CHEM 1110 Laboratory Manual for guidance.

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Determining Molar Mass of Magnesium

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  1. Molar Mass of Magnesium Go to browse and set to full screen.

  2. Stand and buret clamp 100 mL Gas buret 40 mL 6 M HCl 600 mL beaker Copper gauze Magnesium turnings

  3. Accurately weigh by difference between 50 and 70 mg of magnesium turnings.

  4. Place the magnesium turnings in a copper gauze under a small funnel inverted on the bottom of 600 mL beaker.

  5. Add 450 mL of tap water to the beaker.

  6. Carefully pour 40 mL of 6M HCl through a funnel into a 100 mL gas buret.

  7. Fill the buret right to the top with distilled water,

  8. Then seal it with a rubber stopper so that all air bubbles are excluded.

  9. Carefully invert the 100 mL gas buret,

  10. And place the stopper end under the surface of the water in the 600 mL beaker.

  11. Remove the stopper and carefully lower the open end of the gas buret over the stem of the small funnel until the gas buret rests on it.

  12. Grasping the whole assembly, clamp the gas buret in a buret clamp to maintain it in a vertical position.

  13. Evolution of hydrogen gas

  14. After hydrogen gas evolution has ceased, tap the gas buret to dislodge any bubbles trapped in the copper gauze..

  15. Measure the volume (in mL) of the hydrogen gas. 62.5 mL

  16. Measure the difference in height (in mm) of the solution levels in the buret and the beaker.

  17. Measure the temperature of the solution in the beaker.

  18. Record the vapour pressure of water in mm Hg. Record the atmospheric pressure in mm Hg.

  19. Review the page 26 in the CHEM 1110 Laboratory Manual for reading the barometer.

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