Kẹo Đường Kết Tinh

Nuôi tinh thể đường ăn được trên que

Crystallization Beginner (Middle School) 25 phút ~$4,00

Mục tiêu

Nuôi tinh thể đường lớn (saccarozơ) trên que để tạo kẹo đá, minh họa sự quá bão hòa và sự tạo mầm với sản phẩm ăn được.

Bối cảnh

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.

Cảnh báo an toàn

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

PPE cần thiết

goggles

Vật liệu

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

Thiết bị

Saucepan Stove or hot plate Tall glass jar Pencil Clothespin

Quy trình

1

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

10 phút Hot syrup — burns risk
2

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

2 phút
3

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

3 phút
4

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

2 phút
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 phút
6

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

5 phút

Kết quả dự kiến

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.

Dọn dẹp

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

Frequently Asked Questions

What is the objective of Kẹo Đường Kết Tinh?
Nuôi tinh thể đường lớn (saccarozơ) trên que để tạo kẹo đá, minh họa sự quá bão hòa và sự tạo mầm với sản phẩm ăn được.
How difficult is Kẹo Đường Kết Tinh?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Kẹo Đường Kết Tinh?
Key safety precautions include: Sugar syrup is extremely hot — burns risk; Supervise children during the boiling step.
What materials are needed for Kẹo Đường Kết Tinh?
The main materials required are: Granulated sugar, Water, Cotton string, Food coloring, Flavoring extract.
What results should I expect from Kẹo Đường Kết Tinh?
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.