Сахарные кристаллы (леденцы на палочке)

Выращивание съедобных кристаллов сахара на нити

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

Цель

Вырастить крупные кристаллы сахарозы на нити, изготовив леденцы и демонстрируя пересыщение и нуклеацию на примере съедобного продукта.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles

Материалы

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

Оборудование

Saucepan Stove or hot plate Tall glass jar Pencil Clothespin

Процедура

1

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

10 мин Hot syrup — burns risk
2

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

2 мин
3

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

3 мин
4

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

2 мин
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 мин
6

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

5 мин

Ожидаемые результаты

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.

Уборка

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

Frequently Asked Questions

What is the objective of Сахарные кристаллы (леденцы на палочке)?
Вырастить крупные кристаллы сахарозы на нити, изготовив леденцы и демонстрируя пересыщение и нуклеацию на примере съедобного продукта.
How difficult is Сахарные кристаллы (леденцы на палочке)?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for Сахарные кристаллы (леденцы на палочке)?
Key safety precautions include: Sugar syrup is extremely hot — burns risk; Supervise children during the boiling step.
What materials are needed for Сахарные кристаллы (леденцы на палочке)?
The main materials required are: Granulated sugar, Water, Cotton string, Food coloring, Flavoring extract.
What results should I expect from Сахарные кристаллы (леденцы на палочке)?
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.