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Neutralisation of NaOH by HCl:
(1) Reminders


HCl



HCl gaz

Pure hydrogen chloride is a colourless gas with a pungent odour.
This substance is made up of molecules ($HCl$).


HCl solution

The colourless aqueous solution of this gas is called chlorhydric acid
During it's dissolution, the substance has been split to hydrogen and chloride ions.

$HCl(g) \longrightarrow H^+ + Cl^-$


NaOH



HCl gaz

Pure sodium hydroxide is a white solid.
The substance is made up of ions associated to form a cristalline lattice ($Na^+OH^-$).


HCl solution

The colourless aqueous solution of this substance is called caustic soda
During it's dissolution, the sodium and hydroxide ions have been liberated and introduced into water.


$Na^+OH^-(s) \longrightarrow Na^+ + OH^-$