Question

The mineral dolomite is a mixture of magnesium carbonate and calcium carbonate. an aqueous reagent, x, was added to a small sample of dolomite. effervescence was seen and a white solid, y, was formed. what could be the correct identity of reagent x and solid y? reagent x solid y a hydrochloric acid calcium chloride b hydrochloric acid magnesium chloride c sulfuric acid calcium sulfate d sulfuric acid magnesium sulfate

Answer 1

Dear student,

● Answer -
Reagent X => Sulphuric acid
White solid Y => Calcium sulphate

● Explanation -
Dolomite reacts with conc. sulphuric acid (reagent X) to give calcium sulphate (white solid Y) and magnesium sulphate.
MgCO3(s) + CaCO3(s) + 2H2SO4(aq) --> MgSO4(aq) + CaSO4(s) + 2H2O(aq) + 2CO2(g)

CO2 (which results in effervescence) & H2O are formed as byproducts in this reaction.

Hope this helps you...