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How many grams of I2 are present in a solution if 33.75mL of 0.140M Na2S2O3 solution is needed to titrate the I2solution?

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    I2 + 2S2O3^2- ==> 2I^- + S4O6^2-

    mols S2O3^2- = M x L = ?
    1 mol I2 = 2 mol S2O3^2-; therefore, mols S2O3^2- = 2*mols I2.
    Then M S2O3^2- = mols S2O3^2-/L S2O3^2-

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