Züchtung von Kupfersulfat-Kristallen

Herstellung großer blauer Kristalle durch langsame Verdunstung

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

Ziel

Große, gut ausgebildete Kupfersulfat-Pentahydrat-Kristalle durch die Methode der langsamen Verdunstung züchten und dabei Übersättigung sowie Kristallgitterbildung demonstrieren.

Hintergrund

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.

Sicherheitswarnungen

  • 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

Erforderliche PSA

goggles gloves

Materialien

  • 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

Ausrüstung

400 mL beaker Hot plate Stirring rod Filter paper Funnel

Durchführung

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.

Erwartete Ergebnisse

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.

Aufräumen

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

Details

Kategorie
Crystallization
Schwierigkeit
Beginner (Middle School)
Dauer
30 Min.
Geschätzte Kosten
$8,00
Schritte
6
Materialien
4

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Frequently Asked Questions

What is the objective of Züchtung von Kupfersulfat-Kristallen?
Große, gut ausgebildete Kupfersulfat-Pentahydrat-Kristalle durch die Methode der langsamen Verdunstung züchten und dabei Übersättigung sowie Kristallgitterbildung demonstrieren.
How difficult is Züchtung von Kupfersulfat-Kristallen?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Züchtung von Kupfersulfat-Kristallen?
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 Züchtung von Kupfersulfat-Kristallen?
The main materials required are: Copper(II) sulfate pentahydrate, Distilled water, Thread or fishing line, Pencil or stick.
What results should I expect from Züchtung von Kupfersulfat-Kristallen?
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.