Teste de Chama do Cálcio

Identificação do cálcio pela sua chama laranja-avermelhada

Flame Tests Beginner (Middle School) 15 min ~$5,00

Objetivo

Observar a chama vermelho tijolo a laranja-avermelhada produzida pelos íons de cálcio, um elemento comum em calcário, mármore e ossos.

Contexto

Calcium produces a distinctive brick-red to orange-red flame color. The emission results from electronic transitions in calcium atoms excited by the flame energy. Calcium is one of the most abundant elements in the Earth's crust and its flame test is a useful diagnostic tool in mineral identification.

Avisos de segurança

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

EPI necessário

goggles lab_coat

Materiais

  • Calcium chloride (CaCl₂) (1 g)
    Common road de-icer
  • Hydrochloric acid (HCl) (10 mL)
    1M concentration
  • Distilled water (50 mL)
    For cleaning

Equipamentos

Bunsen burner Nichrome wire loop Watch glass Forceps

Procedimento

1

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

2 min
2

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

1 min
3

Hold the wire in the Bunsen burner flame and observe the flame color.

2 min
4

Record the brick-red to orange-red color and note how it differs from strontium and lithium.

2 min

Resultados esperados

A brick-red to orange-red flame should appear. The color is less vivid than strontium's scarlet and more orange than lithium's crimson. Calcium's flame is moderate in intensity.

Limpeza

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

Detalhes

Categoria
Flame Tests
Dificuldade
Beginner (Middle School)
Duração
15 min
Custo estimado
$5,00
Passos
4
Materiais
3

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Frequently Asked Questions

What is the objective of Teste de Chama do Cálcio?
Observar a chama vermelho tijolo a laranja-avermelhada produzida pelos íons de cálcio, um elemento comum em calcário, mármore e ossos.
How difficult is Teste de Chama do Cálcio?
This experiment is rated as Beginner (Middle School). It takes approximately 15 minutes to complete.
What safety precautions are needed for Teste de Chama do Cálcio?
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 Teste de Chama do Cálcio?
The main materials required are: Calcium chloride (CaCl₂), Hydrochloric acid (HCl), Distilled water.
What results should I expect from Teste de Chama do Cálcio?
A brick-red to orange-red flame should appear. The color is less vivid than strontium's scarlet and more orange than lithium's crimson. Calcium's flame is moderate in intensity.