really struggling with this question on titrations

darcey miller

this question is about reactions of calcium compounds.
a pure solid is thought to be calcium hydroxide. the solid can be identified from its relative formula mass.
the relative formula mass can be determined experimentally by reacting a measured mass of the pure solid with an excess of hydrochloric acid. the equation for this reaction is this:
Ca(OH)2 + 2HCl -----> CaCl2 + 2H2O
The unreacted acid can then be determined by titration with a standard sodium hydroxide solution.
You are provided with 50.0cm3 of 0.200 mol dm-3 hydrochloric acid. Outline, giving brief practical details, how you would conduct an experiment to calculate accurately the relative formula mass of the solid using this method. (8 marks)