Think & Answer
Take 100 mL of water in a measuring flask. Now, take a teaspoonful of salt and include it in the water. After some time you can see the level of water remains same. Why?
Answers
This is an example of electrostriction - see, for example, this paper for a full explanation.
In short, the solvent molecules become more ordered in the vicinity of dissolved (charged) ions and less ordered as we go further away from the dissolved (charged) ions. The increase of solvent density near the ions is offset by the decrease of bulk density in the solvent as distance from the ions increases. This results in an overall net reduction in the observed volume of the solution.
From the Discussion section of the manuscript:
The interaction of the electrostatic field of an ion with water tends to align the dipolar water molecules in the direction of the field. In this way the field tends to disrupt hydrogen bonded structures in liquid water, and to compress the water molecules surrounding an ion. These electrostatic effect give rise to a shrinkage of the water.
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Explanation:
The salt has dissolved in water.
2. It actually dissolved in water and now it cannot be seen.
3. The change in volume is so minute that it is negligible because the water molecules are loosely packed, they have spaces between them. When salt is dissolved, it will occupy those spaces. Thus, no change in level of water.
4. The particles are soluble in water as they are easily dissolved.
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