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Knowledge Bank

WIOPEDIA - The WIOTEC® electroplating encyclopaedia


Knowledge from A - Z

D

Dissociation

If a molecule is split into smaller fragments, this is called dissociation. A distinction is made between thermal dissociation and electrolytic dissociation, which is particularly important in electroplating.

Thermal dissociation:
Cracking processes
Decomposition by heating
Technical pyrolysis (pyrolysis is the term for chemical-thermal transformation processes)

Electrolytic dissociation:
Decomposition of bases, acids, salts in (mostly) water as a solvent. This produces electrically charged ions. If these are already present in the initial substance, one speaks of a "real" or "permanent" electrolyte. These can be ion crystals of salts, metal oxides or hydroxides.
In the case of potential electrolytes, such as ammonia, acids and organic bases, it is only by reacting with the solvent.

Strong electrolytes are completely dissociated in the solvent water, as the example of hydrochloric acid shows:
HCl+H2OH3O+ + Cl-.

Weak electrolytes are only partially dissociated, as can be seen in the example of vinegar:
CH3COOH + H2O CH3COO- + H3O+

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