सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण

वास्तविक समय में माइक्रोस्कोप के तहत क्रिस्टल वृद्धि का अवलोकन

Crystallization Intermediate (High School) 30 मिनट ~$10.00

उद्देश्य

माइक्रोस्कोप के तहत सैलोल क्रिस्टल की वास्तविक-समय वृद्धि का अवलोकन करें, नाभिकीकरण, क्रिस्टल वृद्धि दर, और तापमान के क्रिस्टल आकारिकी पर प्रभाव का अध्ययन करें।

पृष्ठभूमि

Salol (phenyl salicylate) has a melting point of 43°C, making it perfect for observing crystallization under a microscope in real time. It can be melted on a microscope slide and watched as it crystallizes, with the crystal fronts growing visibly. Supercooling is easily demonstrated.

सुरक्षा चेतावनियाँ

  • Salol can irritate skin — wash hands after handling
  • Handle microscope slides carefully — breakage risk
  • Do not overheat salol (decomposes above 70°C)

आवश्यक PPE

goggles

सामग्री

  • Salol (phenyl salicylate) (2 g)
    Melting point 43°C
  • Microscope slides (3)
  • Cover slips (3)

उपकरण

Microscope (at least 40x) Hot plate or warm water bath Tweezers Timer

प्रक्रिया

1

Place a small amount of salol on a microscope slide. Warm gently on the hot plate until the salol melts (43°C). Place a cover slip on top.

5 मिनट Do not overheat — decomposes above 70°C
2

Place the slide on the microscope stage. Focus at low magnification (40x). Allow to cool.

3 मिनट
3

Watch for nucleation points — small bright spots where crystal growth begins.

5 मिनट
4

Observe the crystal growth fronts expanding across the field of view. Time the growth rate.

5 मिनट
5

Touch a cold metal object to one edge of the slide to create a temperature gradient. Observe how crystal morphology changes with cooling rate.

5 मिनट
6

Draw or photograph the crystal patterns. Note the needle-like or fan-shaped morphology.

5 मिनट

अपेक्षित परिणाम

Needle-like or fan-shaped crystal fronts should be visible growing across the field of view in real time. Faster cooling produces finer needles; slower cooling produces larger, more regular crystals. Supercooling may be observed (liquid persists below 43°C until nucleation occurs).

सफाई

Allow slides to cool completely. Scrape off salol and dispose in solid waste. Clean slides with ethanol.

Frequently Asked Questions

What is the objective of सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण?
माइक्रोस्कोप के तहत सैलोल क्रिस्टल की वास्तविक-समय वृद्धि का अवलोकन करें, नाभिकीकरण, क्रिस्टल वृद्धि दर, और तापमान के क्रिस्टल आकारिकी पर प्रभाव का अध्ययन करें।
How difficult is सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण?
Key safety precautions include: Salol can irritate skin — wash hands after handling; Handle microscope slides carefully — breakage risk; Do not overheat salol (decomposes above 70°C).
What materials are needed for सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण?
The main materials required are: Salol (phenyl salicylate), Microscope slides, Cover slips.
What results should I expect from सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण?
Needle-like or fan-shaped crystal fronts should be visible growing across the field of view in real time. Faster cooling produces finer needles; slower cooling produces larger, more regular crystals. Supercooling may be observed (liquid persists below 43°C until nucleation occurs).