불꽃 발광 분광 분석

분광기와 불꽃으로 금속의 정량적 확인

Qualitative Analysis Advanced (University) 60 분 ~$15.00

목표

분광기를 사용하여 불꽃 속 다양한 금속 이온의 발광선 파장을 관찰하고 측정한다.

배경

While simple flame tests show color, a spectroscope reveals the discrete emission lines responsible for those colors. Each element has a unique set of emission lines (an atomic fingerprint). This experiment bridges qualitative flame testing with the quantitative science of atomic emission spectroscopy, demonstrating Bohr's model of the atom and the origin of spectral lines.

안전 경고

  • Methanol is highly flammable and toxic — handle with extreme care
  • Do not look directly at the flame without the spectroscope
  • Keep all flammable materials away from the burner
  • Ensure good ventilation

필수 개인 보호 장비

goggles gloves lab_coat

재료

  • Metal salt solutions (0.5M) (5 mL each)
    Na, Li, K, Cu, Sr, Ca, Ba chlorides
  • Hydrochloric acid (1M) (20 mL)
    Wire cleaning
  • Methanol (50 mL)
    For solution flame method
  • Distilled water (50 mL)

장비

Handheld spectroscope or diffraction grating Bunsen burner Nichrome wire loops (7) Watch glasses (7) Spray bottle (for mist method)

실험 절차

1

Set up the spectroscope by viewing a fluorescent light to calibrate and identify the mercury emission lines as reference.

5 분
2

Clean a nichrome wire with HCl. Dip in sodium chloride solution and hold in the flame. View through the spectroscope and record the bright yellow emission at 589 nm.

7 분
3

Repeat with lithium chloride. Record the bright red emission line near 671 nm.

7 분
4

Repeat with potassium chloride. View through cobalt glass to filter sodium contamination. Record the violet emission near 766 nm.

7 분
5

Test copper, strontium, calcium, and barium chlorides in sequence. For each, record all visible emission lines and their approximate wavelengths.

20 분 Clean wire between samples
6

Compile an emission spectrum chart showing each element's characteristic lines. Compare with published spectral data.

14 분

예상 결과

Each metal shows distinct spectral lines: Na at 589 nm (yellow doublet), Li at 671 nm (red), K at 766 nm (violet, visible through cobalt glass), Cu at 510–515 nm (green) and 325 nm, Sr at 461 nm (blue) and 606 nm (orange-red).

정리

Clean all nichrome wires with HCl. Dispose of metal salt solutions in inorganic waste. Rinse watch glasses.

세부 정보

카테고리
Qualitative Analysis
난이도
Advanced (University)
소요 시간
60 분
예상 비용
$15.00
단계
6
재료
4

더 많은 실험

탄수화물의 아이오딘-전분 시험 30 min 할로겐에 대한 베이슈타인 시험 25 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 pH 지시약 무지개 45 min

Frequently Asked Questions

What is the objective of 불꽃 발광 분광 분석?
분광기를 사용하여 불꽃 속 다양한 금속 이온의 발광선 파장을 관찰하고 측정한다.
How difficult is 불꽃 발광 분광 분석?
This experiment is rated as Advanced (University). It takes approximately 60 minutes to complete.
What safety precautions are needed for 불꽃 발광 분광 분석?
Key safety precautions include: Methanol is highly flammable and toxic — handle with extreme care; Do not look directly at the flame without the spectroscope; Keep all flammable materials away from the burner.
What materials are needed for 불꽃 발광 분광 분석?
The main materials required are: Metal salt solutions (0.5M), Hydrochloric acid (1M), Methanol, Distilled water.
What results should I expect from 불꽃 발광 분광 분석?
Each metal shows distinct spectral lines: Na at 589 nm (yellow doublet), Li at 671 nm (red), K at 766 nm (violet, visible through cobalt glass), Cu at 510–515 nm (green) and 325 nm, Sr at 461 nm (blue) and 606 nm (orange-red).