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A very small Koc value is expected (estimated 0.2287) due to the polarity of the inorganic salt/dianion. Sodium dithionite does only exist for hours in aqueous solution because of it's hydrolysis property.

The vapour pressure is negligible and it has a very high solubitily and decomposition in water. The Henry constant is near to zero due to the ionic character of the inorganic salt.