Kết Tinh Phân Đoạn Muối và Cát
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Tách hỗn hợp bằng sự khác biệt về độ tan
Mục tiêu
Tách hỗn hợp muối và cát bằng kết tinh phân đoạn, minh họa quá trình hòa tan, lọc và kết tinh bay hơi.
Bối cảnh
This classic separation technique exploits the fact that salt dissolves in water while sand does not. The mixture is dissolved in hot water, filtered to remove sand, and then the salt is recovered by evaporation. This is fundamentally how salt has been harvested from seawater for millennia.
Cảnh báo an toàn
- Handle hot evaporating dish with tongs
- Do not heat to dryness too rapidly — spattering risk
PPE cần thiết
Vật liệu
-
Salt-sand mixture (10 g)Pre-mixed approximately 50:50
-
Distilled water (100 mL)
Thiết bị
Quy trình
Weigh 10 g of the salt-sand mixture and record the mass.
Add the mixture to 100 mL of warm water in the beaker. Stir for 5 minutes to dissolve all the salt.
Filter the mixture through filter paper. The sand remains on the filter; the salt solution passes through.
Rinse the sand on the filter with a small amount of distilled water. Dry the sand and weigh it.
Pour the filtrate into the evaporating dish. Heat gently on the hot plate to evaporate the water.
Once dry, weigh the recovered salt. Calculate the percentage of each component.
Compare the total recovered mass with the initial mass. Calculate percent recovery.
Kết quả dự kiến
The total mass of recovered salt + sand should be close to the original 10 g (typically 90-98% recovery). Some loss occurs during transfer and on filter paper. The separated components should be visually distinct.
Dọn dẹp
Salt solution can go down the drain. Sand can go in the trash. Rinse all glassware.
Chi tiết
- Danh mục
- Crystallization
- Độ khó
- Beginner (Middle School)
- Thời gian
- 35 phút
- Chi phí ước tính
- $3,00
- Số bước
- 7
- Vật liệu
- 2