Nuôi Tinh Thể Phèn Chua
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Tạo tinh thể phèn chua lớn trong suốt
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
Vật liệu
-
Potassium alum (100 g)Food-grade available
-
Distilled water (300 mL)Hot
-
Thread or monofilament (30 cm)
Thiết bị
Quy trình
Heat 300 mL of distilled water to near boiling. Slowly dissolve as much alum as possible (about 80-100 g) while stirring.
Filter the hot solution to remove any undissolved particles.
Pour a small amount into a dish and let it cool to form seed crystals overnight.
Select the best octahedral seed crystal. Tie it to thread and suspend in the main solution.
Cover loosely and store in a stable, cool location. Check daily.
After 1-2 weeks, remove the crystal, dry with a paper towel, and photograph the octahedral faces.
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.
Chi tiết
- Danh mục
- Crystallization
- Độ khó
- Beginner (Middle School)
- Thời gian
- 30 phút
- Chi phí ước tính
- $6,00
- Số bước
- 6
- Vật liệu
- 3