Литиевый пламенный тест

Определение лития по карминово-красному пламени

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

Цель

Наблюдать характерный карминово-красный цвет пламени ионов лития и сравнить его с пламенными тестами других щелочных металлов.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles lab_coat

Материалы

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

Оборудование

Bunsen burner Nichrome wire loop Watch glass Forceps

Процедура

1

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

2 мин
2

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

1 мин
3

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

1 мин
4

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

2 мин Keep face away from flame
5

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

1 мин

Ожидаемые результаты

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).

Уборка

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

Детали

Категория
Flame Tests
Сложность
Beginner (Middle School)
Продолжительность
15 мин
Прим. стоимость
$8,00
Шаги
5
Материалы
3

Ещё эксперименты

Бариевый пламенный тест 20 min Калиевый пламенный тест 20 min Кальциевый пламенный тест 15 min Медный пламенный тест 15 min Натриевый пламенный тест 15 min Сравнительная лаборатория пламенных тестов 45 min Стронциевый пламенный тест 15 min

Frequently Asked Questions

What is the objective of Литиевый пламенный тест?
Наблюдать характерный карминово-красный цвет пламени ионов лития и сравнить его с пламенными тестами других щелочных металлов.
How difficult is Литиевый пламенный тест?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Литиевый пламенный тест?
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 Литиевый пламенный тест?
The main materials required are: Lithium chloride (LiCl), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Литиевый пламенный тест?
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).