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Reference.org
Tellurous acid
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<p>Tellurous acid is an <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> H2TeO3. It is the <a href="/facts/Oxoacid/p0bMdwSx">oxoacid</a> of tellurium(IV). This compound is not well characterized. An alternative way of writing its formula is (HO)2TeO. In principle, tellurous acid would form by treatment of <a href="/facts/Tellurium_dioxide/yrILUsAM">tellurium dioxide</a> with water, that is by hydrolysis. The related conjugate base is well known in the form of several salts such as potassium hydrogen tellurite, KHTeO3. </p>