An impure sample (0.70 g) of potassium carbonate (K2CO3) is dissolved in enough water to make 200.0 mL of solution A. A 20.00 mL aliquot of solution A is taken and put into an Erlenmeyer flask. To the flask is added 20.00 mL of 0.170 M HCl. The reaction proceeds according to the following balanced chemical equation: K2CO3 + 2 HCl 2 KC1+CO2 + HO The excess HCl in solution is then back titrated with 0.105 M NaOH requiring 24.00 mls for neutralisation.