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Physical & Chemical properties

Appearance / physical state / colour

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Description of key information

The test item potassium sulfite (K2SO3, Molecular weight 158.26), CAS 10117 -38 -1 is a colourless hexagonal crystalline solid. 

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

Additional information

For the evaluation of this endpoint, data from one study report and from one 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 describe Potassium sulfite as a colourless hexagonal crystalline.

An unpublished BASF study is available in which the physicol-chemical properties of the substance were characterised. The appearance was determined by visual inspection. The test item is a white, fine powder. Homogeneous by visual inspection at room temperature.

Comparing these two information it can be stated that Potassium sulfite is a colourless to white powder with no specific odour.