Answer:
Explanation:
This is an example of a mixture which can be separated with simple separation techniques based on the physical properties of the mixtures.Magnetism, and filtration and evaporation
Iron is a magnetic material,but salt and sand are not,Therefore,the iron can be separated from the mixture with the use of magnet.
Salt and sand are mixable.But salt is soluble in water,but sand is not.Therefore by adding the sand and salt to water,the salt will dissolve,in the water(solvent) to form a salt solution. But the sand can be separated out of the solution by filtration with the filter paper inserted into a funnel which allows the salt solution to pass through,while restricting the sand.
The sand would be removed by the filter paper,while solution passes through.
The salt solution and some sand residues is placed in evaporating dish and heated at low temperature. The water from the solution evaporates,leaving the salt behind.
A combination of two are more substances that is not chemically combined is called a mixture.
In order to separate a mixture of iron, salt and sand, we need a magnet, water, a filter and a hot plate. The magnet is brought close to the mixture and all the iron is removed.
Next, water is added. The water will dissolve the salt while the sand will settle beneath the vessel. The solution can now be filtered and the sand is removed. To recover the salt, the solution is heated using the hot plate until all the water is evaporated and the dry salt is recovered from solution.
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