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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

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.