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Physical & Chemical properties

Water solubility

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Description of key information

Sodium sulfite is highly soluble in water. 

Key value for chemical safety assessment

Water solubility:
307 g/L
at the temperature of:
25 °C

Additional information

For the evaluation of this endpoint data from the CRC handbook were used as key information, supported by some other handbook data. According to "ECHA, Guidance on information requirements and chemical safety assessment – Chapter R.7a: Endpoint specific guidance", handbook data are considered to be from a trusted source. These handbooks including the CRC handbook.

According to the key information, sodium sulfite is highly soluble in water (determined at 25°C; no pH was given). This information is supported by various other references:

Merck Index: Sodium sulfite is soluble in 3.2 parts water at 25°C.

Kirk Othmer: Approximately 280 g sodium sulfite are soluble in one litre of water. The substance has its maximum solubility at 33.4°C; at higher temperatures it is less soluble in water. The pH was determined to be 9.8.

IARC: Sodium sulfite has a water solubility of 125.4 g/L or 283 g/L at 0°C or 80°C, respectively.

All these data confirm that sodium sulfite is highly soluble in water.