Question

Is the dissolution of sodium chloride in the water a physical or chemical change?

Answer 1

The molecular formula of water is${{\text{H}}_{\text{2}}}{\text{O}}$. The molecular weight of water is${\text{18g}}$. The water has intermolecular hydrogen bonding between the water molecules. Water exists in all states of matter. The solid-state of water is called ice cubes. The gas state of water is known as water vapor. The liquid state of water is known as such water. Hydrogen combines with oxygen in the presence of an electric current to form the product of water. Water is one of the good conductors of an electric city.
${\text{2}}{{\text{H}}_{\text{2}}}{\text{ + }}{{\text{O}}_{\text{2}}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}$

Complete answer:
The chemical formula of sodium chloride is$NaCl$. Once this sodium chloride is dissolved in water means dissociation will happen.
The chemical reaction for the dissociation of sodium chloride is given below,
$NaCl \to N{a^ + } + C{l^ - }$
From the above equation, we came to the dissolution of sodium chloride in water is not a chemical change, because no new chemical bond is formed and the state of sodium chloride is changed from solid to liquid.
According to the above discussion, we conclude the dissolution of sodium chloride in water is a physical change.

Note:
Water is classified into two types. This classification is based on the amounts of the mineral and the two types of water are hard water and soft water. Hard water means the water contains high amounts of minerals ions. Soft water means the water contains low amounts of minerals ions. The hardness of water is classified into two types. There is the temporary and permanent hardness of the water.