살롤(살리실산페닐) 결정화

현미경으로 실시간 결정 성장 관찰하기

Crystallization Intermediate (High School) 30 분 ~$10.00

목표

현미경 아래에서 살롤 결정의 실시간 성장을 관찰하고, 핵 생성·결정 성장 속도·온도가 결정 형태에 미치는 영향을 연구한다.

배경

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.

안전 경고

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

필수 개인 보호 장비

goggles

재료

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

장비

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

실험 절차

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 분 Do not overheat — decomposes above 70°C
2

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

3 분
3

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

5 분
4

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

5 분
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 분
6

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

5 분

예상 결과

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).

정리

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

세부 정보

카테고리
Crystallization
난이도
Intermediate (High School)
소요 시간
30 분
예상 비용
$10.00
단계
6
재료
3

더 많은 실험

비스무트 무지개빛 결정 키우기 45 min 안식향산 재결정 정제 45 min 과포화와 순간 결정화 35 min 황산구리 결정 키우기 30 min 소금과 모래의 분별 결정화 35 min 명반 결정 키우기 30 min 설탕 결정(락캔디) 25 min

Frequently Asked Questions

What is the objective of 살롤(살리실산페닐) 결정화?
현미경 아래에서 살롤 결정의 실시간 성장을 관찰하고, 핵 생성·결정 성장 속도·온도가 결정 형태에 미치는 영향을 연구한다.
How difficult is 살롤(살리실산페닐) 결정화?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for 살롤(살리실산페닐) 결정화?
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 살롤(살리실산페닐) 결정화?
The main materials required are: Salol (phenyl salicylate), Microscope slides, Cover slips.
What results should I expect from 살롤(살리실산페닐) 결정화?
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).