Cultivo de Cristais de Alúmen

Criação de grandes cristais transparentes de alúmen

Crystallization Beginner (Middle School) 30 min ~$6,00

Objetivo

Cultivar grandes cristais octaédricos transparentes de alúmen de potássio a partir de uma solução supersaturada.

Contexto

Potassium alum (KAl(SO₄)₂·12H₂O) crystallizes in a beautiful octahedral habit. It is non-toxic, inexpensive, and easy to grow into large crystals. The octahedral shape reflects the cubic crystal system of alum.

Avisos de segurança

  • Use care with hot water
  • Alum is generally safe but avoid ingestion of large amounts

EPI necessário

goggles

Materiais

  • Potassium alum (100 g)
    Food-grade available
  • Distilled water (300 mL)
    Hot
  • Thread or monofilament (30 cm)

Equipamentos

500 mL beaker Hot plate Stirring rod Pencil Filter paper

Procedimento

1

Heat 300 mL of distilled water to near boiling. Slowly dissolve as much alum as possible (about 80-100 g) while stirring.

10 min Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 min
3

Pour a small amount into a dish and let it cool to form seed crystals overnight.

2 min
4

Select the best octahedral seed crystal. Tie it to thread and suspend in the main solution.

5 min
5

Cover loosely and store in a stable, cool location. Check daily.

2 min
6

After 1-2 weeks, remove the crystal, dry with a paper towel, and photograph the octahedral faces.

5 min

Resultados esperados

Large, transparent, octahedral crystals up to 2-4 cm across after 1-2 weeks. The faces should be smooth and the crystal should be nearly colorless and transparent.

Limpeza

Alum solution can be saved for future crystal growing or disposed down the drain. Rinse beaker.

Detalhes

Categoria
Crystallization
Dificuldade
Beginner (Middle School)
Duração
30 min
Custo estimado
$6,00
Passos
6
Materiais
3

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Frequently Asked Questions

What is the objective of Cultivo de Cristais de Alúmen?
Cultivar grandes cristais octaédricos transparentes de alúmen de potássio a partir de uma solução supersaturada.
How difficult is Cultivo de Cristais de Alúmen?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Cultivo de Cristais de Alúmen?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for Cultivo de Cristais de Alúmen?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from Cultivo de Cristais de Alúmen?
Large, transparent, octahedral crystals up to 2-4 cm across after 1-2 weeks. The faces should be smooth and the crystal should be nearly colorless and transparent.