ミョウバン結晶の育成

大きな透明なミョウバン結晶を作る

Crystallization Beginner (Middle School) 30 分 ~$6.00

目的

過飽和溶液から大きく透明な八面体状のカリウムミョウバン結晶を育成する。

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.

安全上の警告

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

必要なPPE

goggles

材料

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

器具

500 mL beaker Hot plate Stirring rod Pencil Filter paper

手順

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 Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 分
3

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

2 分
4

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

5 分
5

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

2 分
6

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

5 分

予想される結果

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.

後片付け

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

詳細

カテゴリ
Crystallization
難易度
Beginner (Middle School)
所要時間
30 分
推定費用
$6.00
ステップ数
6
材料
3

その他の実験

サロール（サリチル酸フェニル）の結晶化 30 min ビスマス虹色結晶の育成 45 min 塩と砂の分別結晶化 35 min 安息香酸の再結晶精製 45 min 砂糖の結晶（ロックキャンディ） 25 min 硫酸銅結晶の育成 30 min 過飽和と瞬間結晶化 35 min

Frequently Asked Questions

What is the objective of ミョウバン結晶の育成?
過飽和溶液から大きく透明な八面体状のカリウムミョウバン結晶を育成する。
How difficult is ミョウバン結晶の育成?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for ミョウバン結晶の育成?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for ミョウバン結晶の育成?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from ミョウバン結晶の育成?
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.