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SSS035 - Sodium sulfites, thiosulfate and persulfate
Using these sodium salts safely in practical work, Includes metabisulfite and the equivalent  potassium salts. Sodium sulfite is also known as sodium sulfate(IV), sodium hydrogensulfite  as sodium hydrogensulfate (IV), sodium  metabisulfate as sodium disulfate(IV), and sodium persulfate as sodium peroxodisulfate(IV).