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Nuôi tinh thể đường ăn được trên que
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
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
Quy trình
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.
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.
Chi tiết
- Danh mục
- Crystallization
- Độ khó
- Beginner (Middle School)
- Thời gian
- 25 phút
- Chi phí ước tính
- $4,00
- Số bước
- 6
- Vật liệu
- 5