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Physical & Chemical properties

Appearance / physical state / colour

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Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Study period:
from 2008-06-03 to 2008-07-02
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Substance was inspected visually.
GLP compliance:
yes
Physical state at 20°C and 1013 hPa:
solid
Form:
powder
Colour:
white
Odour:
other: no data
Substance type:
inorganic
Conclusions:
The test item is a white, fine powder. Homogeneous by visual inspection at room temperature.
Executive summary:

The test substance, Potassium sulfite, was inspected visually. The test item is a white, fine powder. Homogeneous by visual inspection at room temperature.

Endpoint:
appearance / physical state / colour
Type of information:
other: Handbook data
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
Ffrom a trusted source acc. to "ECHA, Guidance on information requirements and chemical safety assessment – Chapter R.7a: Endpoint specific guidance".
Qualifier:
no guideline followed
Principles of method if other than guideline:
Not applicable - Handbook data
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
solid
Form:
crystalline
Colour:
Colourless
Odour:
other: no data
Substance type:
inorganic
Conclusions:
According to the reference, dipotassium sulfite appears as a colourless hexagonal crystalline.

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:
solid
Form:
other: powder or crystalline
Colour:
colourless
white

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.