루미놀 화학발광

가열 없이 화학 반응으로 청색 빛 생성하기

Classroom Demonstrations Intermediate (High School) 30 분 ~$15.00

목표

촉매 존재 하에 과산화수소로 루미놀을 산화시켜 가시적인 청색 빛을 생성함으로써 화학발광을 실증한다.

배경

Luminol (3-aminophthalhydrazide) produces an eerie blue glow when oxidized by hydrogen peroxide in basic solution with a transition metal catalyst. The oxidation produces 3-aminophthalate in an excited electronic state, which releases energy as a photon of blue light (425 nm) as it returns to the ground state. This is the same reaction used by forensic scientists to detect trace amounts of blood at crime scenes, where the iron in hemoglobin acts as the catalyst.

안전 경고

  • NaOH is corrosive — handle with care
  • Potassium ferricyanide is harmful if ingested
  • Perform in a dark room for best effect
  • Do not mix stock solutions until ready to demonstrate

필수 개인 보호 장비

goggles gloves lab_coat

재료

  • Luminol (0.5 g)
    3-aminophthalhydrazide
  • Sodium hydroxide (NaOH) (5 g)
    To make solution basic
  • Hydrogen peroxide (3%) (50 mL)
    Household concentration
  • Potassium ferricyanide (K₃[Fe(CN)₆]) (0.5 g)
    Catalyst
  • Distilled water (500 mL)

장비

Beakers (500 mL, 2) Spiral glass tubing or clear tubing Dark room or blackout curtains Magnetic stirrer (optional)

실험 절차

1

Prepare Solution A: Dissolve 0.5 g luminol and 5 g NaOH in 250 mL distilled water.

5 분 NaOH is corrosive
2

Prepare Solution B: Dissolve 0.5 g K₃[Fe(CN)₆] in 250 mL of 3% H₂O₂.

5 분
3

Darken the room completely. Allow eyes to adjust for 1–2 minutes.

2 분
4

Pour both solutions simultaneously into a large beaker or through spiral glass tubing. A bright blue glow appears immediately.

3 분
5

Observe the glow lasting for several minutes. Stirring or agitation renews the glow by mixing fresh reactants.

10 분
6

Discuss the mechanism: luminol oxidation → excited 3-aminophthalate → photon emission (425 nm). Compare with bioluminescence and fluorescence.

5 분

예상 결과

A vivid blue glow appears when the solutions are mixed. The light intensity peaks immediately and fades over several minutes. The glow is bright enough to read by in a completely dark room.

정리

The spent solution is relatively non-toxic. Pour down the drain with copious water. Rinse all glassware.

세부 정보

카테고리
Classroom Demonstrations
난이도
Intermediate (High School)
소요 시간
30 분
예상 비용
$15.00
단계
6
재료
5

더 많은 실험

드라이아이스 속 마그네슘 연소 25 min 진동하는 브릭스-라우처 반응 40 min 나트륨과 물의 반응 25 min 아이오딘 시계 반응 45 min 사라지는 비커(굴절률 매칭) 15 min 코끼리 치약 20 min 테르밋 반응 30 min 비뉴턴 유체: 우블렉 20 min 밀도 컬럼 무지개 30 min 순간 냉동: 과냉각수 120 min

Frequently Asked Questions

What is the objective of 루미놀 화학발광?
촉매 존재 하에 과산화수소로 루미놀을 산화시켜 가시적인 청색 빛을 생성함으로써 화학발광을 실증한다.
How difficult is 루미놀 화학발광?
This experiment is rated as Intermediate (High School). It takes approximately 30 minutes to complete.
What safety precautions are needed for 루미놀 화학발광?
Key safety precautions include: NaOH is corrosive — handle with care; Potassium ferricyanide is harmful if ingested; Perform in a dark room for best effect.
What materials are needed for 루미놀 화학발광?
The main materials required are: Luminol, Sodium hydroxide (NaOH), Hydrogen peroxide (3%), Potassium ferricyanide (K₃[Fe(CN)₆]), Distilled water.
What results should I expect from 루미놀 화학발광?
A vivid blue glow appears when the solutions are mixed. The light intensity peaks immediately and fades over several minutes. The glow is bright enough to read by in a completely dark room.