Thử Nghiệm Ngọn Lửa Liti

Nhận biết liti qua ngọn lửa đỏ thắm

Flame Tests Beginner (Middle School) 15 phút ~$8,00

Mục tiêu

Quan sát màu đỏ thắm đặc trưng của ngọn lửa do các ion liti tạo ra, và so sánh với các thử nghiệm ngọn lửa của kim loại kiềm khác.

Bối cảnh

Lithium produces a distinctive crimson-red flame when heated. The emission occurs primarily at 670.8 nm as the excited 2s electron returns to the ground state. Lithium compounds were historically used to produce red colors in fireworks before the introduction of strontium-based alternatives.

Cảnh báo an toàn

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

PPE cần thiết

goggles lab_coat

Vật liệu

  • Lithium chloride (LiCl) (1 g)
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Thiết bị

Bunsen burner Nichrome wire loop Watch glass Forceps

Quy trình

1

Clean the nichrome wire by dipping in HCl and heating until no color is visible in the flame.

2 phút
2

Place a small amount of lithium chloride on the watch glass.

1 phút
3

Dip the clean wire into HCl, then touch it to the lithium chloride sample.

1 phút
4

Hold the wire in the Bunsen burner flame and observe the characteristic crimson-red color.

2 phút Keep face away from flame
5

Record observations and compare with the sodium flame test if already performed.

1 phút

Kết quả dự kiến

A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).

Dọn dẹp

Clean the wire loop with HCl. Dispose of chemicals per lab protocol.

Frequently Asked Questions

What is the objective of Thử Nghiệm Ngọn Lửa Liti?
Quan sát màu đỏ thắm đặc trưng của ngọn lửa do các ion liti tạo ra, và so sánh với các thử nghiệm ngọn lửa của kim loại kiềm khác.
How difficult is Thử Nghiệm Ngọn Lửa Liti?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Thử Nghiệm Ngọn Lửa Liti?
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 Thử Nghiệm Ngọn Lửa Liti?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Thử Nghiệm Ngọn Lửa Liti?
A bright crimson-red flame should appear. The color is distinct from the red produced by strontium (which is more scarlet) and potassium (which is lilac/violet).