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Physical & Chemical properties

Appearance / physical state / colour

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Description of key information

Dipotassium disulfite is a white, microcrystalline and - by visual inspection - homogeneous powder. 

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

For the evaluation of this endpoint, data from two handbooks was used as a weight of evidence. According to the REACH regulation (“ECHA, guidance on information requirements and chemical safety assessment – chapter R.7a”), it is allowed to use specific handbook data as a reliable data source. Useful reference books and data compilations containing peer reviewed physico-chemical data include the Merck Index and the CRC Handbook of Chemistry and Physics.

Data available from the CRC handbook and the Merck index describe Dipotassium disulfite as a white crystalline powder with a specific sulfur dioxide odour.