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Dissociation constant

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Description of key information

Peer-reviewed public domain data provided the three dissociation constants for phosphoric acid in the range of pKa1= 2.1 - 2.2, pKa2=7.1 - 7.2 and pKa3=12.3 - 12.4. Temperature of measurement (where reported) was 25 deg C.

Key value for chemical safety assessment

Additional information

As the reported pKa values are in a close range, the mean rounded-up values were taken. Temperature of measurement was either 25°C or not reported. It is anticipated that the calculated rounded-up values are applicable at a temperature of 20°C. Value used for CSA: pKa1 = 2.1, pKa2 = 7.2, pKa3 = 12.3 at 20°C

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