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Physical & Chemical properties

Water solubility

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Description of key information

Tartaric acid and its salts are soluble in water.

Key value for chemical safety assessment

Additional information

A collection of the water solubility data was performed for tartaric acid and its salts (i.e. monosodium, monopotassium, sodium potassium, sodium, potassium and calcium tartrate). A summary of these data (with the indication of the minimum-maximum value of water solubility) is detailed below.

EC name

water solubility (g/L)

interpretation of result

(+)-tartaric acid

582-1390

very soluble

(-)-tartaric acid 

1000-1390

very soluble

(±)-tartaric acid

172-215

very soluble

mesotartaric acid

560-1250

very soluble

potassium hydrogen tartrate

5,7-6,17

soluble

potassium sodium tartrate

474-1470

very soluble

calcium tartrate

0,40-0,48

moderately soluble

sodium hydrogen tartrate

526

very soluble

disodium tartrate

250-333

very soluble

dipotassium tartrate

-

-

The water solubility of dextrotartaric ((+)-tartaric acid), levotartaric ((-)-tartaric acid) and mesotartaric acid are of the same order of magnitude. Only the solubility of the racemic form of acid tartaric ((±)-tartaric acid) is lower than the other forms of tartaric acid. Overall, all forms of tartaric acid are judged as very soluble in water.

With regard to acid tartaric salts, although there are significant differences in the found values, all substances resulted to be water soluble.