明矾晶体的培育

制备大型透明明矾晶体

Crystallization Beginner (Middle School) 30 分钟 ~$6.00

目标

从过饱和溶液中培育大而透明的八面体钾明矾晶体。

背景

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.

安全警告

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

所需PPE

goggles

材料

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

设备

500 mL beaker Hot plate Stirring rod Pencil Filter paper

步骤

1

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

10 分钟 Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 分钟
3

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

2 分钟
4

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

5 分钟
5

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

2 分钟
6

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

5 分钟

预期结果

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.

清理

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

详情

类别
Crystallization
难度
Beginner (Middle School)
时长
30 分钟
预估费用
$6.00
步骤数
6
材料
3

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Frequently Asked Questions

What is the objective of 明矾晶体的培育?
从过饱和溶液中培育大而透明的八面体钾明矾晶体。
How difficult is 明矾晶体的培育?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for 明矾晶体的培育?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for 明矾晶体的培育?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from 明矾晶体的培育?
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.