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Physical & Chemical properties

Melting point / freezing point

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Description of key information

The melting point value of arsenic acid hemihydrate is determined to be 35.0°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
35 °C

Additional information

Several values bibliographic sources are available and provide melting point values in the range 35.0-36.1°C. Those values are attributed to arsenic acid hemihydrate. Two key values are available 35°C and 36.1°C. The lowest value (35.0°C) is retained as key value since two other sources (flagged as supporting study) provide values much closer than 35.0°C rather than 36.1°C.