Can any one explain in detail how to prepare the K2S4O6 aqueous solution and how to acidify with H2SO4 to pH 2 ?

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Carlos Araújo Queiroz

Potassium tetrathionate (aq. sol.) could be expected to react with added sulfuric acid (aq. sol.) to generate tetrathionic acid and potassium sulfate: K2S4O6 + H2SO4 ⇌ H2S4O6 + K2SO4. Both H2S4O6 and (excess) H2SO4 should then contribute for acidic pH.

M. Newishy

OK, I need to make 3% K2S4O6 with pH 2, what will be the amount of H2SO4 required?