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    Jan 3, 2013, 10:04 AM
    Magnesium Carbonate, MgCO3, is used in indigestion tablets... Full Question Below:
    Magnesium Carbonate, MgCO3, is used in indigestion tablets as it reacts with and neutralizes stomach acids. The equation for the reaction between MgCO3 and HCl is shown below:

    MgCO3(aq) + 2HCl(aq) ---> MgCl2(aq) + CO2(g) + H2O(l)

    ... and so the active constituent is the carbonate dianion, CO3(^2-), with Mg(^2+) being an inert counter ion...

    CO3(^2-)(aq) + 2H+(aq) ----> CO2(g) + H2O(l)

    Some tablets also contain aluminium hydroxide, which acts in a similar way...

    Al(OH)3(aq) + 3HCl(aq) ---> AlCl3(aq) + 3H2O(l)

    ... and so the active constituent is the hydroxide anion, with Al(^3+) being an inert counter ion...

    HO-(aq) + H+(aq) ---> H2O(l)

    The Gaviscon Extra Strength brand contains 0.0749 g of CO3(^2-) and 0.105 g of HO- in each tablet.

    (I) What mass of Mg(2+) is present in each tablet? Show your reasoning/Calculation. (10 marks)




    (ii) What mass of Al(^3+) is present in each tablet? Show your reasoning/Calculation. (10 marks)




    (iii) What total volume of 0.5 M HCl (in cm^3) is required to react with the MgCO3 and the Al(OH)3 present in one tablet? Show your reasoning/Calculation. (20 marks)

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