칼륨 불꽃 반응

라일락/보라색 불꽃으로 칼륨 확인하기

Flame Tests Beginner (Middle School) 20 분 ~$6.00

목표

칼륨 이온이 나타내는 라일락/보라색 불꽃을 관찰하고, 코발트 블루 유리를 사용해 나트륨 오염과 구별하는 방법을 배운다.

배경

Potassium produces a pale lilac or violet flame when heated. The emission occurs at 766.5 nm and 769.9 nm (near-infrared/deep red doublet). Because the flame is quite faint and easily overwhelmed by sodium's intense yellow, cobalt blue glass is used as a filter to block sodium emission and reveal potassium's true color.

안전 경고

  • Wear safety goggles at all times
  • Keep hair tied back near open flames
  • Handle HCl with care

필수 개인 보호 장비

goggles lab_coat

재료

  • Potassium chloride (KCl) (1 g)
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Cobalt blue glass (1 piece)
    For filtering sodium light

장비

Bunsen burner Nichrome wire loop Watch glass Forceps

실험 절차

1

Clean the nichrome wire thoroughly by dipping in HCl and heating.

2 분
2

Place potassium chloride on the watch glass and collect a sample on the clean wire.

1 분
3

Hold the sample in the Bunsen burner flame. Observe with the naked eye first.

2 분
4

Now observe the flame through cobalt blue glass to filter out any sodium contamination.

2 분
5

Record the difference in appearance with and without the cobalt blue glass filter.

2 분

예상 결과

Without the filter, you may see a faint lilac color possibly masked by yellow from sodium impurities. Through the cobalt blue glass, a clear violet/lilac flame should be visible as the glass absorbs the yellow sodium emission.

정리

Clean the wire loop with HCl. Return cobalt blue glass to storage.

세부 정보

카테고리
Flame Tests
난이도
Beginner (Middle School)
소요 시간
20 분
예상 비용
$6.00
단계
5
재료
3

더 많은 실험

스트론튬 불꽃 반응 15 min 나트륨 불꽃 반응 15 min 구리 불꽃 반응 15 min 리튬 불꽃 반응 15 min 바륨 불꽃 반응 20 min 칼슘 불꽃 반응 15 min 불꽃 반응 비교 실험 45 min

Frequently Asked Questions

What is the objective of 칼륨 불꽃 반응?
칼륨 이온이 나타내는 라일락/보라색 불꽃을 관찰하고, 코발트 블루 유리를 사용해 나트륨 오염과 구별하는 방법을 배운다.
How difficult is 칼륨 불꽃 반응?
This experiment is rated as Beginner (Middle School). It takes approximately 20 minutes to complete.
What safety precautions are needed for 칼륨 불꽃 반응?
Key safety precautions include: Wear safety goggles at all times; Keep hair tied back near open flames; Handle HCl with care.
What materials are needed for 칼륨 불꽃 반응?
The main materials required are: Potassium chloride (KCl), Hydrochloric acid (HCl), Cobalt blue glass.
What results should I expect from 칼륨 불꽃 반응?
Without the filter, you may see a faint lilac color possibly masked by yellow from sodium impurities. Through the cobalt blue glass, a clear violet/lilac flame should be visible as the glass absorbs the yellow sodium emission.