Experimental purpose:

1. Master the operational skills of dissolution, filtration, evaporation and other experiments.

2. Understand the chemical principles of filtration to separate mixtures.

3. Understand the application of the principle of filtration in social reality such as life and production.

Experimental results:

Coarse salt contains insoluble impurities such as sediment, as well as soluble impurities such as: etc. Insoluble impurities can be removed by dissolving and filtering, and then the water can be evaporated to obtain purer refined salt.

Coarse salt is a crystal formed by frying and drying salt water from seawater or salt wells, salt pools, and salt springs. It is natural salt. It is unprocessed large-grained salt. The main component is sodium chloride, but due to Contains impurities such as magnesium chloride, which is easily deliquescent in the air, so pay attention to humidity when storing. It can stimulate and promote the secretion of sebaceous glands, help discharge aging substances from the body and remove surface dead layers, thereby renewing the skin.