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EC number: 212-769-1
CAS number: 868-14-4
The pKa values for tartaric acid are: pKa1=2.98 and pKa2=4.34.With regard tartaric acid salts, the dissociation constant study does not need to be performed in accordance with section 1 of REACH Annex XI, since salts are reaction products of acids and bases that retain their ionic character.
A collection of the pKa was performed for tartaric acid and its salts
(i.e. monosodium, monopotassium, sodium potassium, sodium, potassium and
calcium tartrate). As result, the following values were found:
2.93 - 2.98
4.23 - 4.34
2.93 - 3.00
2.96 - 3.03
4.24 - 4.37
3.11 - 3.17
4.80 - 4.91
With regard tartaric acid salts, the dissociation constant study does
not need to be performed in accordance with section 1 of REACH Annex XI,
since salts are reaction products of acids and bases that retain their
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