Cultivo de Cristais de Sulfato de Cobre

Produção de grandes cristais azuis por evaporação lenta

Crystallization Beginner (Middle School) 30 min ~$8,00

Objetivo

Cultivar grandes cristais bem formados de sulfato de cobre pentahidratado usando o método de evaporação lenta, demonstrando a supersaturação e a formação de rede cristalina.

Contexto

Copper sulfate pentahydrate (CuSO₄·5H₂O) forms beautiful blue triclinic crystals. By preparing a saturated solution and allowing it to evaporate slowly over several days, large single crystals can be grown. The process demonstrates concepts of solubility, supersaturation, and crystal nucleation.

Avisos de segurança

  • Copper sulfate is toxic if ingested
  • Wear gloves when handling the solution
  • Wash hands thoroughly after the experiment
  • Do not dispose of copper sulfate down the drain

EPI necessário

goggles gloves

Materiais

  • Copper(II) sulfate pentahydrate (50 g)
    Blue crystals
  • Distilled water (200 mL)
    Hot
  • Thread or fishing line (30 cm)
    For seed crystal
  • Pencil or stick (1)
    To suspend seed crystal

Equipamentos

400 mL beaker Hot plate Stirring rod Filter paper Funnel

Procedimento

1

Heat 200 mL of distilled water to 60-70°C. Add copper sulfate gradually while stirring until no more dissolves (saturated solution).

10 min Wear gloves — copper sulfate is toxic
2

Filter the hot saturated solution through filter paper to remove any undissolved particles.

5 min
3

Pour a small amount into a petri dish and allow it to cool. Select the best small crystal as a seed crystal after 24 hours.

5 min
4

Tie the seed crystal to a thread and suspend it from a pencil placed across the top of the beaker of saturated solution.

5 min
5

Cover the beaker loosely with filter paper to allow slow evaporation. Place in a vibration-free location.

2 min
6

Check daily for crystal growth. Remove any small crystals that form on the thread or beaker walls.

3 min

Resultados esperados

After 1-2 weeks, the seed crystal should grow into a large blue crystal (1-3 cm) with well-defined facets. The crystal has a triclinic shape with distinct flat faces. Faster evaporation produces many small crystals; slower produces fewer, larger ones.

Limpeza

Collect excess copper sulfate solution and solid for reuse or proper disposal in heavy metal waste. Do not pour down the drain.

Detalhes

Categoria
Crystallization
Dificuldade
Beginner (Middle School)
Duração
30 min
Custo estimado
$8,00
Passos
6
Materiais
4

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Frequently Asked Questions

What is the objective of Cultivo de Cristais de Sulfato de Cobre?
Cultivar grandes cristais bem formados de sulfato de cobre pentahidratado usando o método de evaporação lenta, demonstrando a supersaturação e a formação de rede cristalina.
How difficult is Cultivo de Cristais de Sulfato de Cobre?
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 Sulfato de Cobre?
Key safety precautions include: Copper sulfate is toxic if ingested; Wear gloves when handling the solution; Wash hands thoroughly after the experiment.
What materials are needed for Cultivo de Cristais de Sulfato de Cobre?
The main materials required are: Copper(II) sulfate pentahydrate, Distilled water, Thread or fishing line, Pencil or stick.
What results should I expect from Cultivo de Cristais de Sulfato de Cobre?
After 1-2 weeks, the seed crystal should grow into a large blue crystal (1-3 cm) with well-defined facets. The crystal has a triclinic shape with distinct flat faces. Faster evaporation produces many small crystals; slower produces fewer, larger ones.