설탕 결정(락캔디)

실에 먹을 수 있는 설탕 결정 키우기

Crystallization Beginner (Middle School) 25 분 ~$4.00

목표

실 위에 큰 설탕(수크로스) 결정을 키워 락캔디를 만들고, 먹을 수 있는 제품으로 과포화와 핵 생성을 실증한다.

배경

Rock candy is made by suspending a string in a supersaturated sugar solution and waiting for crystals to grow. Sugar is unusual in that it is extremely soluble in water (about 2 kg per liter at 100°C) and forms large monoclinic crystals with well-defined facets.

안전 경고

  • Sugar syrup is extremely hot — burns risk
  • Supervise children during the boiling step

필수 개인 보호 장비

goggles

재료

  • Granulated sugar (500 g)
    White sugar
  • Water (200 mL)
  • Cotton string (30 cm)
    Unbleached
  • Food coloring (5 drops)
    Optional
  • Flavoring extract (1 tsp)
    Optional

장비

Saucepan Stove or hot plate Tall glass jar Pencil Clothespin

실험 절차

1

Heat 200 mL water to boiling in the saucepan. Gradually dissolve 400-500 g sugar, stirring continuously.

10 분 Hot syrup — burns risk
2

Remove from heat. Add food coloring and flavoring if desired.

2 분
3

Wet the cotton string with water and roll in granulated sugar to create nucleation sites. Let dry for a few hours.

3 분
4

Pour the cooled (but still warm) sugar solution into the glass jar.

2 분
5

Suspend the prepared string from a pencil across the top of the jar so it hangs in the solution without touching the sides or bottom.

3 분
6

Cover loosely and place in a stable location. Check daily for 5-7 days. Crystals should grow along the string.

5 분

예상 결과

After 5-7 days, large sugar crystals (1-3 cm) should form along the string, creating rock candy. Crystals are monoclinic with flat, angled faces. The result is edible.

정리

Excess sugar solution can be reheated and reused. Wash all equipment with warm water.

세부 정보

카테고리
Crystallization
난이도
Beginner (Middle School)
소요 시간
25 분
예상 비용
$4.00
단계
6
재료
5

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Frequently Asked Questions

What is the objective of 설탕 결정(락캔디)?
실 위에 큰 설탕(수크로스) 결정을 키워 락캔디를 만들고, 먹을 수 있는 제품으로 과포화와 핵 생성을 실증한다.
How difficult is 설탕 결정(락캔디)?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for 설탕 결정(락캔디)?
Key safety precautions include: Sugar syrup is extremely hot — burns risk; Supervise children during the boiling step.
What materials are needed for 설탕 결정(락캔디)?
The main materials required are: Granulated sugar, Water, Cotton string, Food coloring, Flavoring extract.
What results should I expect from 설탕 결정(락캔디)?
After 5-7 days, large sugar crystals (1-3 cm) should form along the string, creating rock candy. Crystals are monoclinic with flat, angled faces. The result is edible.