サロール（サリチル酸フェニル）の結晶化

顕微鏡下でリアルタイムの結晶成長を観察する

Crystallization Intermediate (High School) 30 分 ~$10.00

目的

顕微鏡下でサロール結晶のリアルタイムの成長を観察し、核形成・結晶成長速度・温度が結晶形態に与える影響を調べる。

背景

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.

安全上の警告

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

必要なPPE

goggles

材料

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

器具

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

手順

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 分 Do not overheat — decomposes above 70°C
2

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

3 分
3

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

5 分
4

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

5 分
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 分
6

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

5 分

予想される結果

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).

後片付け

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

詳細

カテゴリ
Crystallization
難易度
Intermediate (High School)
所要時間
30 分
推定費用
$10.00
ステップ数
6
材料
3

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Frequently Asked Questions

What is the objective of サロール（サリチル酸フェニル）の結晶化?
顕微鏡下でサロール結晶のリアルタイムの成長を観察し、核形成・結晶成長速度・温度が結晶形態に与える影響を調べる。
How difficult is サロール（サリチル酸フェニル）の結晶化?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for サロール（サリチル酸フェニル）の結晶化?
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 サロール（サリチル酸フェニル）の結晶化?
The main materials required are: Salol (phenyl salicylate), Microscope slides, Cover slips.
What results should I expect from サロール（サリチル酸フェニル）の結晶化?
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).