A student separates salt from a mixture of salt and sand.
What is the correct order of steps for the student to take?
A) filter -> evaporate -> shake with water
B) filter -> shake with water -> evaporate
C) shake with water -> evaporate -> filter
D) shake with water -> filter -> evaporate
Answer (2)
The correct order of steps to separate salt from sand is to shake with water, filter the mixture, and then evaporate the water to obtain salt crystals. Therefore, the chosen option is B) filter -> shake with water -> evaporate.
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To correctly separate salt from a mixture of salt and sand, the student should follow a specific sequence of steps to ensure that both components are properly isolated. The correct order is option D) shake with water -> filter -> evaporate. Here's a breakdown of each step:
Shake with Water : The first step is to add water to the mixture of salt and sand. Salt is soluble in water, whereas sand is not. By shaking the mixture, the salt dissolves, forming a salt water solution, while the sand remains as a solid.
Filter : Next, the mixture is poured through a filter. The filter paper will allow the salt water solution to pass through while trapping the solid sand particles. This step effectively separates most of the sand from the salt water.
Evaporate : Finally, to obtain the salt from the salt water solution, the water is evaporated. This can be done by heating the solution gently until the water completely evaporates, leaving the salt behind. Evaporation allows the salt to be collected as a solid.
By following these steps in the correct order, the student can successfully separate the salt from the mixture. This method leverages the differences in physical properties between salt and sand, such as solubility in water and the ability to filter solids from liquids.
