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Dissociation constant

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Description of key information

The disscociation constant of the reaction mass of magnesium carbonate, magnesium hydroxide, magnesium oxide and magnesium peroxide is not determined as the reaction mass is hydrolytically unstable. Instead, information on the relevant degradation products has been included.

Key value for chemical safety assessment

Additional information

The disscociation constant of the reaction mass of magnesium carbonate, magnesium hydroxide, magnesium oxide and magnesium peroxide is not determined as the reaction mass is hydrolytically unstable. Instead, information on the relevant degradation products has been included.

The literature value available for the dissociation constant of hydrogen peroxide at 25 °C is:

pKa = 11.62.

Magnesium hydroxide has a very low solubility in water (1.78 x 10^-3 g total solids/L) and any Magnesium hydroxide dissolved is dissociated completely. The low water solubility hampers the determination of the dissociation constant.