Question

Write the chemical equation involved in the preparation of sodium hydroxide . Name the process. For 0

Answer 1

case -1 Hot Concentrated NaOH

The reaction between chlorine and hot concentrated sodium hydroxide solution is:

NaOH + Cl2 -> 5NaCl + NaClO3 + 3H2O

The unfamiliar product this time is sodium chlorate(V) - NaClO3.

As before, check the oxidation states of everything in the equation. Once again, you will find that the only thing to have changed is the chlorine. It goes from 0 in the chlorine molecules on the left-hand side to -1 (in the NaCl) and +5 (in the NaClO3).This is also a disproportionation reaction.

Case -2 Cold NaOH

The reaction between chlorine and cold dilute sodium hydroxide solution is:

2NaOH + Cl2 -> NaCl + NaClO + H2O

NaClO (sometimes written as NaOCl) is sodium chlorate(I). The old name for this is sodium hypochlorite - and the solution on the right-hand side of the equation is what is normally sold as bleach.

Answer 2

It is produced by electrolysis of a concentrated aqueous solution of sodium chloride(which is called brine solution)

When electricity is passed through a concentrated solution of sodium chloride, it decomposes to form sodium hydroxide, chlorine and hydrogen.

naoh