Kristalisasi Salol (Fenil Salisilat)

Mengamati pertumbuhan kristal di bawah mikroskop secara real time

Crystallization Intermediate (High School) 30 menit ~$10,00

Tujuan

Amati pertumbuhan kristal salol secara real-time di bawah mikroskop, mempelajari nukleasi, laju pertumbuhan kristal, dan efek suhu pada morfologi kristal.

Latar Belakang

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.

Peringatan Keselamatan

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

APD yang Diperlukan

goggles

Bahan

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

Peralatan

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

Prosedur

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 menit Do not overheat — decomposes above 70°C
2

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

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3

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

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4

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

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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.

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6

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

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Hasil yang Diharapkan

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).

Pembersihan

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

Detail

Kategori
Crystallization
Tingkat Kesulitan
Intermediate (High School)
Durasi
30 menit
Perkiraan Biaya
$10,00
Langkah
6
Bahan
3

Eksperimen Lainnya

Kristalisasi Fraksional Garam dan Pasir 35 min Lewat Jenuh dan Kristalisasi Seketika 35 min Menumbuhkan Kristal Pelangi Bismut 45 min Menumbuhkan Kristal Tawas 30 min Menumbuhkan Kristal Tembaga Sulfat 30 min Permen Batu Kristal Gula 25 min Rekristalisasi Asam Benzoat 45 min

Frequently Asked Questions

What is the objective of Kristalisasi Salol (Fenil Salisilat)?
Amati pertumbuhan kristal salol secara real-time di bawah mikroskop, mempelajari nukleasi, laju pertumbuhan kristal, dan efek suhu pada morfologi kristal.
How difficult is Kristalisasi Salol (Fenil Salisilat)?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Kristalisasi Salol (Fenil Salisilat)?
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 Kristalisasi Salol (Fenil Salisilat)?
The main materials required are: Salol (phenyl salicylate), Microscope slides, Cover slips.
What results should I expect from Kristalisasi Salol (Fenil Salisilat)?
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).