Salol (Fenil Salisilat) Kristallenmesi

Kristal büyümesini mikroskopla gerçek zamanlı gözlemleme

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

Hedef

Salol kristallerinin büyümesini mikroskop altında gerçek zamanlı olarak incelemek; çekirdeklenmeyi, kristal büyüme hızlarını ve sıcaklığın kristal morfolojisine etkisini araştırmak.

Arka Plan

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.

Güvenlik Uyarıları

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

Gerekli KKD

goggles

Malzemeler

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

Ekipman

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

Prosedür

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 dak Do not overheat — decomposes above 70°C
2

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

3 dak
3

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

5 dak
4

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

5 dak
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 dak
6

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

5 dak

Beklenen Sonuçlar

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).

Temizlik

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

Ayrıntılar

Kategori
Crystallization
Zorluk
Intermediate (High School)
Süre
30 dak
Tahmini Maliyet
$10,00
Adımlar
6
Malzemeler
3

Daha Fazla Deney

Aşırı Doygunluk ve Anlık Kristallenme 35 min Bakır Sülfat Kristali Büyütme 30 min Benzoik Asidin Yeniden Kristallendirilmesi 45 min Bizmut Gökkuşağı Kristali Büyütme 45 min Şap Kristali Büyütme 30 min Şeker Kristali Akide Şekeri 25 min Tuz ve Kumun Kademeli Kristallenmesi 35 min

Frequently Asked Questions

What is the objective of Salol (Fenil Salisilat) Kristallenmesi?
Salol kristallerinin büyümesini mikroskop altında gerçek zamanlı olarak incelemek; çekirdeklenmeyi, kristal büyüme hızlarını ve sıcaklığın kristal morfolojisine etkisini araştırmak.
How difficult is Salol (Fenil Salisilat) Kristallenmesi?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Salol (Fenil Salisilat) Kristallenmesi?
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 Salol (Fenil Salisilat) Kristallenmesi?
The main materials required are: Salol (phenyl salicylate), Microscope slides, Cover slips.
What results should I expect from Salol (Fenil Salisilat) Kristallenmesi?
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).