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Posted by on Saturday, June 28, 2014 at 7:27pm.

A solution of X2CO3 has a concentration of 15.2 g/dm^3. 25 cm^3 of this solution require 27.5 cm^3 of 0.2 M HCl for complete reaction. Calculate the ralative atomic mass of X

  • Chemistry - , Saturday, June 28, 2014 at 7:54pm

    1 dm^3 = 1000 cm^3 = 1 liter
    so

    X2CO3 is 15.2 g/liter

    a liter of this requires 27.5/25 or 1.1 liters of .2 M HCl
    1.1 * .2 = .22 mols of HCL

    X2CO3 + 2 HCl --> 2 XCl + H2CO3 maybe?

    so we only need .11 mols of X2CO3
    .11 mols of X2CO3 weigh 15.2 grams
    1 mol X2CO3 weighs 138 grams
    C is 12
    O3 is 48
    138 - 12 - 48 = 78
    so X2 is 78 so x is 39
    (Potassium? K2CO3 )

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