Question

why after breaking from NaCl solution to Na, sodium does not react with water?

Answer 1

Hydrolysis refers to a compound breaking down by reaction with water. Sodium chloride does react with water, in a process called electrolysis, giving the following reaction:

2NaCl + 2H₂O → 2NaOH + H₂ + Cl₂

However, this isn't hydrolysis. The only way to make NaCl smaller is to separate it into its ions, which is what happens with dissociation.