Laboratorio de Comparación de Pruebas de Llama

Prueba de múltiples metales para crear una tabla de referencia de colores de llama

Flame Tests Intermediate (High School) 45 min ~$25,00

Objetivo

Realizar pruebas de llama en seis sales metálicas diferentes para crear una tabla de referencia de los colores de llama característicos para el análisis cualitativo.

Antecedentes

This comprehensive flame test lab tests multiple metal salts side by side, building a reference chart that students can use for unknown identification. By comparing the flame colors of lithium, sodium, potassium, calcium, strontium, and copper directly, students develop the observational skills needed for qualitative chemical analysis.

Advertencias de seguridad

  • Wear safety goggles at all times
  • Wear gloves when handling copper chloride
  • Handle HCl with care — avoid contact with skin
  • Keep hair tied back near open flames
  • Clean wire between each test to prevent cross-contamination

EPP requerido

goggles gloves lab_coat

Materiales

  • Lithium chloride (LiCl) (0.5 g)
  • Sodium chloride (NaCl) (0.5 g)
  • Potassium chloride (KCl) (0.5 g)
  • Calcium chloride (CaCl₂) (0.5 g)
  • Strontium chloride (SrCl₂) (0.5 g)
  • Copper(II) chloride (CuCl₂) (0.5 g)
    Toxic
  • Hydrochloric acid (HCl) (50 mL)
    1M concentration
  • Cobalt blue glass (1 piece)
    For potassium identification

Equipamiento

Bunsen burner Nichrome wire loop 6 labeled watch glasses Forceps Lab notebook

Procedimiento

1

Prepare six labeled watch glasses, each containing a small amount of one metal salt.

3 min Wear gloves for copper chloride
2

Clean the nichrome wire thoroughly by repeatedly dipping in HCl and heating until the flame shows no color.

3 min
3

Test lithium chloride first. Dip wire in HCl, then into the salt, and hold in the flame. Record the crimson-red color.

3 min
4

Clean the wire thoroughly. Test sodium chloride and record the bright yellow flame.

3 min
5

Clean the wire. Test potassium chloride. Observe with naked eye, then through cobalt blue glass. Record the lilac/violet color.

4 min
6

Clean the wire. Test calcium chloride and record the orange-red flame.

3 min
7

Clean the wire. Test strontium chloride and record the scarlet-red flame.

3 min
8

Clean the wire. Test copper(II) chloride and record the blue-green flame.

3 min
9

Create a complete reference chart organizing the metals by flame color from red through yellow to green and violet.

5 min

Resultados esperados

A complete flame color reference chart: Li (crimson-red), Sr (scarlet-red), Ca (orange-red), Na (yellow), Ba (yellow-green if tested), Cu (blue-green), K (lilac/violet through cobalt glass). Each color should be distinguishable from the others.

Limpieza

Clean the wire with HCl. Dispose of copper waste in the heavy metal waste container. Dispose of remaining salts per lab protocol. Clean and dry all watch glasses.

Detalles

Categoría
Flame Tests
Dificultad
Intermediate (High School)
Duración
45 min
Costo estimado
$25,00
Pasos
9
Materiales
8

Más experimentos

Prueba de Llama con Bario 20 min Prueba de Llama con Calcio 15 min Prueba de Llama con Cobre 15 min Prueba de Llama con Estroncio 15 min Prueba de Llama con Litio 15 min Prueba de Llama con Potasio 20 min Prueba de Llama con Sodio 15 min

Frequently Asked Questions

What is the objective of Laboratorio de Comparación de Pruebas de Llama?
Realizar pruebas de llama en seis sales metálicas diferentes para crear una tabla de referencia de los colores de llama característicos para el análisis cualitativo.
How difficult is Laboratorio de Comparación de Pruebas de Llama?
This experiment is rated as Intermediate (High School). It takes approximately 45 minutes to complete.
What safety precautions are needed for Laboratorio de Comparación de Pruebas de Llama?
Key safety precautions include: Wear safety goggles at all times; Wear gloves when handling copper chloride; Handle HCl with care — avoid contact with skin.
What materials are needed for Laboratorio de Comparación de Pruebas de Llama?
The main materials required are: Lithium chloride (LiCl), Sodium chloride (NaCl), Potassium chloride (KCl), Calcium chloride (CaCl₂), Strontium chloride (SrCl₂).
What results should I expect from Laboratorio de Comparación de Pruebas de Llama?
A complete flame color reference chart: Li (crimson-red), Sr (scarlet-red), Ca (orange-red), Na (yellow), Ba (yellow-green if tested), Cu (blue-green), K (lilac/violet through cobalt glass). Each color should be distinguishable from the others.