Answer to Question #264681 in Physical Chemistry for Joy

Question

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

... and so the active constituent is the carbonate dianion, CO32-, with Mg2+ being an inert counter ion…

CO32-(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 Al3+ being an inert counter ion…

HO-(aq) + H+ (aq)  H2O(l)

The Asda Extra Strength brand contains 0.0882 g of CO32- and 0.121 g of HO- in each tablet.

(i) What mass of Mg2+ is present in each tablet? Show your reasoning/calculation.

(ii) What mass of Al3+ is present in each tablet? Show your reasoning/calculation.

(iii) What total volume of 0.25 M HCl (in cm3) is required to react with the MgCO3 and the Al(OH)3 present in one tablet? Show your reasoning/calculation.

Answer 1

The answer to your question is provided in the image: