Menumbuhkan Kristal Tawas

Membuat kristal tawas transparan besar

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

Tujuan

Tumbuhkan kristal tawas kalium oktahedral besar dan transparan dari larutan lewat jenuh.

Latar Belakang

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.

Peringatan Keselamatan

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

APD yang Diperlukan

goggles

Bahan

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

Peralatan

500 mL beaker Hot plate Stirring rod Pencil Filter paper

Prosedur

1

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

10 menit Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 menit
3

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

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4

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

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5

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

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6

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

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Hasil yang Diharapkan

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.

Pembersihan

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

Detail

Kategori
Crystallization
Tingkat Kesulitan
Beginner (Middle School)
Durasi
30 menit
Perkiraan Biaya
$6,00
Langkah
6
Bahan
3

Eksperimen Lainnya

Kristalisasi Fraksional Garam dan Pasir 35 min Kristalisasi Salol (Fenil Salisilat) 30 min Lewat Jenuh dan Kristalisasi Seketika 35 min Menumbuhkan Kristal Pelangi Bismut 45 min Menumbuhkan Kristal Tembaga Sulfat 30 min Permen Batu Kristal Gula 25 min Rekristalisasi Asam Benzoat 45 min

Frequently Asked Questions

What is the objective of Menumbuhkan Kristal Tawas?
Tumbuhkan kristal tawas kalium oktahedral besar dan transparan dari larutan lewat jenuh.
How difficult is Menumbuhkan Kristal Tawas?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Menumbuhkan Kristal Tawas?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for Menumbuhkan Kristal Tawas?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from Menumbuhkan Kristal Tawas?
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.