Question

In: Chemistry

Draw a label flow diagram to represent the steps in this sublimation process of benzoic acid

Draw a label flow diagram to represent the steps in this sublimation process of benzoic acid

Solutions

Expert Solution

Solution:

i. Apparatus required:

  • Cold finger
  • Hot plat & heat dissipation block
  • Suction flask
  • Miniature water pump
  • Spatula

ii. Procedural flow diagram:

  1. Place a known quantity, accurately weighed, of benzoic acid in the suction flask placed in a well with a window for observation in a heat dissipation block..
  2. Assemble the cold finger with the flask. Connect it to a miniature water pump with water hoses. Note: Ice can be added to the water container to obtain much cooler water for circulating in the cold finger.
  3. Turn on the heat.
  4. Keep the heat stable at 150 - 155oC. Note: The pure benzoic acid sublimes, crystals form on the cold finger.   
  5. Continue heating until no more crystals form on the cold finger.
  6. Turn off the heat.
  7. Remove the apparatus from the heat, allow it to cool at room temperature.
  8. Carefully, dissemble the cold finger from the suction flask.
  9. Scarp the crystals onto a tared piece of weighing paper and reweigh.
  10. Record the mass of pure benzoic acid.
  11. Calculate the percent recovery using the below formula. % recovery = (Mass recovered / Input mass) x 100%
  12. Measure the melting point the pure benzoic acid to identify its purity.

queen_honey_blossom answered 3 years ago
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