Kết Tinh Phân Đoạn Muối và Cát

Tách hỗn hợp bằng sự khác biệt về độ tan

Crystallization Beginner (Middle School) 35 phút ~$3,00

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

goggles

Vật liệu

  • Salt-sand mixture (10 g)
    Pre-mixed approximately 50:50
  • Distilled water (100 mL)

Thiết bị

250 mL beaker Filter paper Funnel Evaporating dish Hot plate Stirring rod Analytical balance

Quy trình

1

Weigh 10 g of the salt-sand mixture and record the mass.

2 phút
2

Add the mixture to 100 mL of warm water in the beaker. Stir for 5 minutes to dissolve all the salt.

5 phút
3

Filter the mixture through filter paper. The sand remains on the filter; the salt solution passes through.

5 phút
4

Rinse the sand on the filter with a small amount of distilled water. Dry the sand and weigh it.

5 phút
5

Pour the filtrate into the evaporating dish. Heat gently on the hot plate to evaporate the water.

12 phút Remove from heat before completely dry
6

Once dry, weigh the recovered salt. Calculate the percentage of each component.

3 phút
7

Compare the total recovered mass with the initial mass. Calculate percent recovery.

3 phút

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.

Frequently Asked Questions

What is the objective of Kết Tinh Phân Đoạn Muối và Cát?
Tách hỗn hợp muối và cát bằng kết tinh phân đoạn, minh họa quá trình hòa tan, lọc và kết tinh bay hơi.
How difficult is Kết Tinh Phân Đoạn Muối và Cát?
This experiment is rated as Beginner (Middle School). It takes approximately 35 minutes to complete.
What safety precautions are needed for Kết Tinh Phân Đoạn Muối và Cát?
Key safety precautions include: Handle hot evaporating dish with tongs; Do not heat to dryness too rapidly — spattering risk.
What materials are needed for Kết Tinh Phân Đoạn Muối và Cát?
The main materials required are: Salt-sand mixture, Distilled water.
What results should I expect from Kết Tinh Phân Đoạn Muối và Cát?
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.