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When 25 " mL of " an aqueous solution of...

When 25 " mL of " an aqueous solution of `H_2O_2` is titrated with an excess of KI solution in dilute `H_2SO_4`, the liberated `I_2` required 20 " mL of " 0.3 N`Na_2S_2O_3` solution for complete reaction.volume strength of `H_2O_2` solution.

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