Question

question 2. a student has a mixture of sand and salt, whose properties are described in the table below.
substance form at r.t.p. solubility boiling point magnetism
salt solid powder soluble > 1000°c not magnetic
sand solid powder insoluble > 1000°c not magnetic
the student wants to separate the mixture to obtain the sand. she decides to add water to the mixture and then use filtration.
part a. what will happen when the student adds water to the mixture?
part b. when the student filters the mixture, what will happen?
part c. can filtration be used to effectively separate the sand from the mixture?

Explanation:

Step1: Analyze solubility property

Salt is soluble in water while sand is insoluble. When water is added to the mixture, salt will dissolve in water and sand will remain as a solid - like powder in the water.

Step2: Understand the principle of filtration

Filtration is a process that separates solid - insoluble substances from a liquid. When the mixture is filtered, the sand (insoluble solid) will be retained on the filter paper as a residue, and the salt - water solution (salt dissolved in water) will pass through the filter paper as a filtrate.

Step3: Evaluate filtration effectiveness

Since sand is insoluble and salt is soluble, filtration can effectively separate the sand from the mixture as the sand will be trapped by the filter while the salt - water solution will pass through.

Answer:

Part A: The salt will dissolve in water and the sand will remain as a solid in the water.
Part B: The sand will be retained on the filter paper as a residue and the salt - water solution will pass through as a filtrate.
Part C: Yes