Выращивание кристаллов квасцов

Получение крупных прозрачных кристаллов квасцов

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

Цель

Вырастить крупные прозрачные октаэдрические кристаллы квасцов (сульфата калия-алюминия) из пересыщенного раствора.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles

Материалы

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

Оборудование

500 mL beaker Hot plate Stirring rod Pencil Filter paper

Процедура

1

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

10 мин Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 мин
3

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

2 мин
4

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

5 мин
5

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

2 мин
6

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

5 мин

Ожидаемые результаты

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.

Уборка

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

Frequently Asked Questions

What is the objective of Выращивание кристаллов квасцов?
Вырастить крупные прозрачные октаэдрические кристаллы квасцов (сульфата калия-алюминия) из пересыщенного раствора.
How difficult is Выращивание кристаллов квасцов?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for Выращивание кристаллов квасцов?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for Выращивание кристаллов квасцов?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from Выращивание кристаллов квасцов?
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.