Сахарные кристаллы (леденцы на палочке)
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Выращивание съедобных кристаллов сахара на нити
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
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
Процедура
Heat 200 mL water to boiling in the saucepan. Gradually dissolve 400-500 g sugar, stirring continuously.
Remove from heat. Add food coloring and flavoring if desired.
Wet the cotton string with water and roll in granulated sugar to create nucleation sites. Let dry for a few hours.
Pour the cooled (but still warm) sugar solution into the glass jar.
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.
Cover loosely and place in a stable location. Check daily for 5-7 days. Crystals should grow along the string.
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.
Детали
- Категория
- Crystallization
- Сложность
- Beginner (Middle School)
- Продолжительность
- 25 мин
- Прим. стоимость
- $4,00
- Шаги
- 6
- Материалы
- 5