Why is the residue on the filter paper washed with distilled water in the separation of the sand and salt mixture?

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Solution

The residue on the filter paper is washed with distilled water in the separation of the sand and salt mixture so that the whole of the salt dissolves out.

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Q. A student added the following substances to water kept in four separate beakers. He stirred the mixture well and filtered each one of them through a filter paper. He would obtain a solid residue on the filter paper in the case of :
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(2) common salt
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Student	As residue	In the filtrate
I	Ammonium chloride	Sand Common salt
II	Common salt, Sand	Ammonium chloride
III	Sand, Ammonium chloride	Common Salt
IV	Sand	Ammonium chloride, Common salt

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(1) I
(2) IV
(3) III
(4) II

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