Calculate (a) the moles and (b) the mass of magnesium carbonate at the start if 0.2 moles of sulfuric acid is added to the magnesium carbonate and the excess sulfuric acid made up to a 250 cm3 solution. 25 cm3 of this solution required 0.03 moles of sodium hydroxide for neutralisation.

Question

Calculate (a) the moles and (b) the mass of magnesium carbonate at the start if 0.2 moles of sulfuric acid is added to the magnesium carbonate and the excess sulfuric acid made up to a 250 cm3 solution.  25 cm3 of this solution required 0.03 moles of sodium hydroxide for neutralisation.

MgCO3  +  H2SO4  ¨  MgSO4  +  H2O  +  CO2                     H2SO4  + 2

NaOH  ¨  NaCl  +  H2O

Buddy · Accepted Answer

The question is wrong by the way, the product of H2SO4 reacting with 2 NaOH should be Na2SO4 + 2 H2O

Matt · Answer

the actual mass (g) = Number of moles x Molar mass, or m = n x M Number of moles of solute = Concentration (mol. L) x Volume of solution (liters) -1 or n = C x V