OCR AS Revision QuestionWatch
Question I have is:-
"The student adds a lump of limestone with mass 0.13 g to 25.00 cm3 of 0.1 mol dm -3 hydrochloric acid and stirs until the reaction is finished, the solution is then filtered. The excess acid in the filtered solution reacts with 7cm3 of 0.1 mol dm -3 sodium hydroxide. The equations for the reactions are CaCO3 + 2HCl --> Ca Cl2 + CO2 + H2O
HCl + NaOH -->NaCl + H2O
Calculate the percentage of calcium carbonate in the limestone.
Any help would be greatly appreciated.