Question

c) Hydrochloric acid produces salts called chlorides.

Magnesium carbonate reacts with hydrochloric acid to produce magnesium chloride.

MgCO3 + 2HCl + MgCl2 + H2O + CO2

A student used 50.00 cm3 of 2.00 mol/dm3 hydrochloric acid in an experiment to produce magnesium chloride.'

Calculate the mass, in g, of magnesium carbonate needed to react exactly with 50.00 cm of 2.00 mol/dm3 hydrochloric acid using the following steps.

Answer 1

Moles of HCl$=0.050×2=0.1moles$

Moles of magnesium carbonate $=\frac{0.1}{2}=0.05moles$

Mass $=0.05×84=4.2grams$