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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

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Description of key information

NaCl(s) is an inorganic salt and an electrovalent substance that dissociates electrolytically to 100% in water. Thus, is it scientifically not justified to measure the dissociation constant.

Key value for chemical safety assessment

Additional information

NaCl is an electrovalent substance. Electrovalent substances are made up of ions in the solid state. The oppositely charged ions are held together by strong electrostatic (coulombic) force of attraction. Due to these forces the ions cannot move.
When these substances are dissolved in water, the ions free themselves from this binding. Thus the break up of an electrovalent compound into free mobile ions when dissolved in water or when melted, is called electrolytic dissociation.

In the liquid state the ions become free and mobile. But the oppositely charged ions always remain in close proximity of each other.

NaCl(s) ---> Na+ (aq) + Cl- (aq). This is a 100% dissociation.