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    2.60g of X(IO3)2 was dissolved in distilled water and made up to 2dm3 of solution. Excess potassium iodide solution and acid were added to 20cm3 of this solution and the iodine liberated against 0.10 mol do-3 sodium thiosulphatd solution using starch as the indicator. The mean titre was 8cm3. Identify X

    The equations given are IO3- + 5I- + 6H+ > 3I2 + 3H20
    I2 + 2S2O3^2- > 2I- + S4O62-

    The mr should be 390 but I keep getting 200 and then I'm just completely lost from there? Anyone know how to do this?
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