糖晶体（冰糖）

在细绳上生长可食用糖晶体

Crystallization Beginner (Middle School) 25 分钟 ~$4.00

目标

在细绳上培育大型蔗糖晶体制作冰糖，用可食用产品演示过饱和和成核现象。

背景

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.

安全警告

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

所需PPE

goggles

材料

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

设备

Saucepan Stove or hot plate Tall glass jar Pencil Clothespin

步骤

1

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

10 分钟 Hot syrup — burns risk
2

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

2 分钟
3

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

3 分钟
4

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

2 分钟
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 分钟
6

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

5 分钟

预期结果

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.

清理

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

详情

类别
Crystallization
难度
Beginner (Middle School)
时长
25 分钟
预估费用
$4.00
步骤数
6
材料
5

更多实验

明矾晶体的培育 30 min 水杨酸苯酯的结晶 30 min 盐与沙的分步结晶 35 min 硫酸铜晶体的培育 30 min 苯甲酸的重结晶纯化 45 min 过饱和与瞬间结晶 35 min 铋彩虹晶体的培育 45 min

Frequently Asked Questions

What is the objective of 糖晶体（冰糖）?
在细绳上培育大型蔗糖晶体制作冰糖，用可食用产品演示过饱和和成核现象。
How difficult is 糖晶体（冰糖）?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for 糖晶体（冰糖）?
Key safety precautions include: Sugar syrup is extremely hot — burns risk; Supervise children during the boiling step.
What materials are needed for 糖晶体（冰糖）?
The main materials required are: Granulated sugar, Water, Cotton string, Food coloring, Flavoring extract.
What results should I expect from 糖晶体（冰糖）?
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.