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Physical & Chemical properties

Dissociation constant

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Description of key information

The pKa of lithium hydroxide anhydrous is between 13.8 and 14.18 at 20°C. For lithium hydroxide monohydrate also full dissociation is very likely, whereas the pH value of a solution of comparable morality is expected to be lower, due to the content of crystal water (less hydroxyl ions).

Key value for chemical safety assessment

pKa at 20°C:
14

Additional information

Lithium hydroxide is usually considered to be a strong base, almost completely dissociated in aqueous solution. Based on the available data the pKa of lithium hydroxide anhydrous is between 13.8 and 14.18 at 20°C. This result demonstrates the extreme alkaline character of lithium hydroxide anhydrous in aqueous solutions. For lithium hydroxide monohydrate also full dissociation is very likely, whereas the pH value of a solution of comparable morality is expected to be lower, due to the content of crystal water (less hydroxyl ions).

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