할로겐에 대한 베이슈타인 시험

구리선 불꽃 시험으로 유기 화합물의 할로겐 원자 검출하기

Qualitative Analysis Beginner (Middle School) 25 분 ~$5.00

목표

베이슈타인 구리선 시험으로 유기 화합물에 할로겐 원자(Cl, Br, I)가 포함되어 있는지 확인한다.

배경

The Beilstein test is a simple qualitative test for halogens in organic compounds. A copper wire is heated in a flame to form copper(II) oxide, then dipped in the test substance and returned to the flame. If a halogen is present, volatile copper halide forms and imparts a green or blue-green color to the flame. The test is sensitive but not specific (it does not distinguish between Cl, Br, and I, and can give false positives with some nitrogen compounds).

안전 경고

  • Chloroform is toxic — avoid inhalation and skin contact
  • Work in a fume hood when testing volatile organics
  • Hot copper wire can cause burns
  • Keep flammable solvents away from the flame

필수 개인 보호 장비

goggles gloves lab_coat

재료

  • Copper wire (20 gauge) (15 cm)
    Make a small loop at one end
  • Chloroform (CHCl₃) (2 mL)
    Positive control
  • Ethanol (C₂H₅OH) (2 mL)
    Negative control
  • Unknown organic samples (2 mL each)
    3–4 samples
  • Cork or holder for copper wire (1)

장비

Bunsen burner Watch glasses (6) Forceps

실험 절차

1

Heat the copper wire loop in the oxidizing zone of the Bunsen burner until it glows red and no green color is visible (this burns off contaminants and forms CuO).

3 분 Wire is extremely hot
2

Allow the wire to cool slightly, then dip it into the chloroform (positive control). Return the wire to the flame.

3 분 Chloroform is volatile — use fume hood
3

Observe the bright green flame (positive result for halogen). Record the color and intensity.

2 분
4

Clean the wire by heating until green color disappears. Repeat the test with ethanol (negative control). No green color should appear.

3 분
5

Test each unknown sample using the same procedure. Record whether each gives a positive (green) or negative result.

10 분 Clean wire between samples
6

Record all results and identify which unknowns likely contain halogen atoms.

4 분

예상 결과

Chloroform produces a vivid green flame (positive). Ethanol produces no green color (negative). Halogen-containing unknowns show green coloration of varying intensity.

정리

Allow copper wire to cool. Store organic waste in halogenated or non-halogenated solvent waste containers as appropriate. Wipe down surfaces.

세부 정보

카테고리
Qualitative Analysis
난이도
Beginner (Middle School)
소요 시간
25 분
예상 비용
$5.00
단계
6
재료
5

더 많은 실험

탄수화물의 아이오딘-전분 시험 30 min 음이온 확인 시험 60 min 침전에 의한 양이온 확인 90 min 비누 용액으로 경수 시험 40 min 식물 색소의 크로마토그래피 60 min 금속 이온에 대한 붕사 구슬 시험 45 min 미지 물질 확인 도전 75 min 불꽃 발광 분광 분석 60 min pH 지시약 무지개 45 min

Frequently Asked Questions

What is the objective of 할로겐에 대한 베이슈타인 시험?
베이슈타인 구리선 시험으로 유기 화합물에 할로겐 원자(Cl, Br, I)가 포함되어 있는지 확인한다.
How difficult is 할로겐에 대한 베이슈타인 시험?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for 할로겐에 대한 베이슈타인 시험?
Key safety precautions include: Chloroform is toxic — avoid inhalation and skin contact; Work in a fume hood when testing volatile organics; Hot copper wire can cause burns.
What materials are needed for 할로겐에 대한 베이슈타인 시험?
The main materials required are: Copper wire (20 gauge), Chloroform (CHCl₃), Ethanol (C₂H₅OH), Unknown organic samples, Cork or holder for copper wire.
What results should I expect from 할로겐에 대한 베이슈타인 시험?
Chloroform produces a vivid green flame (positive). Ethanol produces no green color (negative). Halogen-containing unknowns show green coloration of varying intensity.