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Physical & Chemical properties

Melting point / freezing point

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Administrative data

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Description of key information

Tartaric acid and its salts are solid at 1013 hPa.

Key value for chemical safety assessment

Additional information

A collection of the melting point values was performed for tartaric acid and its salts (i.e. monosodium, monopotassium, sodium potassium, sodium, potassium and calcium tartrate). All found values are listed below.

EC name

Range of melting point (°C)

Interpretationof data

(+)-tartaric acid

168 - 171

solid

(-)-tartaric acid 

168 - 172

solid

(±)-tartaric acid

170 - 206

solid

 mesotartaric acid

140 - 147

solid

 potassium hydrogen tartrate

230

solid

 potassium sodium tartrate

70 - 100

solid

 calcium tartrate

-

solid

 sodium hydrogen tartrate

-

solid

 disodium tartrate

-

solid

 dipotassium tartrate

-

solid

Based on melting point values, tartaric acid and its salts are solid at room temperature.