सैलोल (फेनाइल सैलिसिलेट) का क्रिस्टलीकरण
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वास्तविक समय में माइक्रोस्कोप के तहत क्रिस्टल वृद्धि का अवलोकन
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
सामग्री
-
Salol (phenyl salicylate) (2 g)Melting point 43°C
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Microscope slides (3)
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Cover slips (3)
उपकरण
प्रक्रिया
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.
Place the slide on the microscope stage. Focus at low magnification (40x). Allow to cool.
Watch for nucleation points — small bright spots where crystal growth begins.
Observe the crystal growth fronts expanding across the field of view. Time the growth rate.
Touch a cold metal object to one edge of the slide to create a temperature gradient. Observe how crystal morphology changes with cooling rate.
Draw or photograph the crystal patterns. Note the needle-like or fan-shaped morphology.
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.
विवरण
- श्रेणी
- Crystallization
- कठिनाई
- Intermediate (High School)
- अवधि
- 30 मिनट
- अनुमानित लागत
- $10.00
- चरण
- 6
- सामग्री
- 3