명반 결정 키우기

크고 투명한 명반 결정 만들기

Crystallization Beginner (Middle School) 30 분 ~$6.00

목표

과포화 용액에서 크고 투명한 팔면체 형태의 칼륨 명반 결정을 키운다.

배경

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.

안전 경고

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

필수 개인 보호 장비

goggles

재료

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

장비

500 mL beaker Hot plate Stirring rod Pencil Filter paper

실험 절차

1

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

10 분 Handle hot liquids carefully
2

Filter the hot solution to remove any undissolved particles.

3 분
3

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

2 분
4

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

5 분
5

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

2 분
6

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

5 분

예상 결과

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.

정리

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

세부 정보

카테고리
Crystallization
난이도
Beginner (Middle School)
소요 시간
30 분
예상 비용
$6.00
단계
6
재료
3

더 많은 실험

비스무트 무지개빛 결정 키우기 45 min 안식향산 재결정 정제 45 min 과포화와 순간 결정화 35 min 황산구리 결정 키우기 30 min 소금과 모래의 분별 결정화 35 min 설탕 결정(락캔디) 25 min 살롤(살리실산페닐) 결정화 30 min

Frequently Asked Questions

What is the objective of 명반 결정 키우기?
과포화 용액에서 크고 투명한 팔면체 형태의 칼륨 명반 결정을 키운다.
How difficult is 명반 결정 키우기?
This experiment is rated as Beginner (Middle School). It takes approximately 30 minutes to complete.
What safety precautions are needed for 명반 결정 키우기?
Key safety precautions include: Use care with hot water; Alum is generally safe but avoid ingestion of large amounts.
What materials are needed for 명반 결정 키우기?
The main materials required are: Potassium alum, Distilled water, Thread or monofilament.
What results should I expect from 명반 결정 키우기?
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.