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Questions and Answers
What is the initial temperature requirement to fully melt the refined bleached and deodorized palm oil?
What is the initial temperature requirement to fully melt the refined bleached and deodorized palm oil?
- 70ºC (correct)
- 22ºC
- 30ºC
- 14ºC
At what time intervals were observations made to measure the morphology of the crystals?
At what time intervals were observations made to measure the morphology of the crystals?
- 10, 30, 60, and 90 minutes
- 5, 15, 30, 60, and 90 minutes (correct)
- 5, 10, 40, and 90 minutes
- 1, 15, 45, and 90 minutes
What was the constant stirring speed maintained during the crystallization process?
What was the constant stirring speed maintained during the crystallization process?
- 100 rpm
- 80 rpm
- 60 rpm
- 90 rpm (correct)
Which tool was used to photograph the crystals during the observations?
Which tool was used to photograph the crystals during the observations?
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What was the crystallization temperature range used in this experiment?
What was the crystallization temperature range used in this experiment?
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Study Notes
Aim
- Investigate the relationship between time and the rate of crystallization in palm oil.
Materials
- Beakers
- Slides
- Cover slips
- Microscope
- Thermally controlled water bath
- Stirring motor with paddle propeller
Procedure
- Palm oil is melted in a beaker at 70°C for 30 minutes.
- The temperature is decreased to 30°C over an hour.
- Then, the temperature is further reduced to 14°C or 22°C over 30 minutes.
- The oil is allowed to crystallize for 90 minutes, with samples taken at 5, 15, 30, 60, and 90 minutes.
- Samples are placed on slides, covered with cover slips, and observed under a microscope at 200x magnification.
- The lengths of the four longest dimensions of each crystal are measured, and an average of at least six crystals is recorded for each observation.
Observation
- The size of the crystals is recorded at each time point in a table.
Analysis
- The rate of crystallization is determined by analyzing the change in crystal size over time.
- The report will likely include the average crystal size at the 90-minute mark.
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