hydrosulfurous acid

noun
hy·dro·sulfurous acid | \"+...-\

Definition of hydrosulfurous acid 

: an unstable acid H2S2O4 known only in aqueous solution formed by reducing sulfurous acid or in the form of salts not used scientifically

called also dithionous acid, hyposulfurous acid

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History and Etymology for hydrosulfurous acid

hydrosulfurous International Scientific Vocabulary hydr- + sulfurous

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