Nuôi Tinh Thể Phèn Chua

Tạo tinh thể phèn chua lớn trong suốt

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

Mục tiêu

Nuôi tinh thể kali phèn chua hình bát diện lớn, trong suốt từ dung dịch quá bão hòa.

Bối cảnh

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.

Cảnh báo an toàn

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

PPE cần thiết

goggles

Vật liệu

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

Thiết bị

500 mL beaker Hot plate Stirring rod Pencil Filter paper

Quy trình

1

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

10 phút Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 phút
3

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

2 phút
4

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

5 phút
5

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

2 phút
6

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

5 phút

Kết quả dự kiến

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.

Dọn dẹp

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

Frequently Asked Questions

What is the objective of Nuôi Tinh Thể Phèn Chua?
Nuôi tinh thể kali phèn chua hình bát diện lớn, trong suốt từ dung dịch quá bão hòa.
How difficult is Nuôi Tinh Thể Phèn Chua?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Nuôi Tinh Thể Phèn Chua?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for Nuôi Tinh Thể Phèn Chua?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from Nuôi Tinh Thể Phèn Chua?
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.