Бариевый пламенный тест

Определение бария по желтовато-зелёному пламени

Flame Tests Intermediate (High School) 20 мин ~$12,00

Цель

Наблюдать бледно-желтовато-зелёное пламя ионов бария и понять, почему соединения бария требуют особых мер безопасности.

Предпосылки

Barium compounds produce a pale yellow-green (apple-green) flame when heated. The emission is primarily from BaCl molecules formed in the flame rather than from atomic barium. Barium compounds are toxic and require careful handling, but the flame test itself uses small quantities safely.

Предупреждения по безопасности

  • Barium chloride is toxic if ingested
  • Wear nitrile gloves when handling barium compounds
  • Wear safety goggles at all times
  • Wash hands thoroughly after the experiment
  • Do not eat or drink in the lab

Требуемые СИЗ

goggles gloves lab_coat

Материалы

  • Barium chloride (BaCl₂) (0.5 g)
    Toxic — handle with care
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Оборудование

Bunsen burner Nichrome wire loop Watch glass Forceps

Процедура

1

Put on nitrile gloves before handling barium chloride.

1 мин Barium compounds are toxic
2

Clean the nichrome wire by dipping in HCl and heating until no color appears.

2 мин
3

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

1 мин Avoid skin contact
4

Dip the clean wire into HCl, then into the barium chloride sample.

1 мин
5

Hold the wire in the Bunsen burner flame and observe the pale yellow-green color.

2 мин
6

Record the color and compare with copper (blue-green) if previously tested.

2 мин

Ожидаемые результаты

A pale yellow-green (apple-green) flame should appear. The color is less vivid than copper's blue-green and has a distinctly yellowish tint. It may be difficult to see in a well-lit room.

Уборка

Clean the wire with HCl. Dispose of barium waste in designated heavy metal waste container. Remove gloves carefully and wash hands thoroughly.

Детали

Категория
Flame Tests
Сложность
Intermediate (High School)
Продолжительность
20 мин
Прим. стоимость
$12,00
Шаги
6
Материалы
3

Ещё эксперименты

Калиевый пламенный тест 20 min Кальциевый пламенный тест 15 min Литиевый 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 Бариевый пламенный тест?
Наблюдать бледно-желтовато-зелёное пламя ионов бария и понять, почему соединения бария требуют особых мер безопасности.
How difficult is Бариевый пламенный тест?
This experiment is rated as Intermediate (High School). It takes approximately 20 minutes to complete.
What safety precautions are needed for Бариевый пламенный тест?
Key safety precautions include: Barium chloride is toxic if ingested; Wear nitrile gloves when handling barium compounds; Wear safety goggles at all times.
What materials are needed for Бариевый пламенный тест?
The main materials required are: Barium chloride (BaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Бариевый пламенный тест?
A pale yellow-green (apple-green) flame should appear. The color is less vivid than copper's blue-green and has a distinctly yellowish tint. It may be difficult to see in a well-lit room.