Preparation and Standardization of 0.1 M Hydrochloric acid (HCl).In a 1000 mL volumetric flask that has been washed and dried, pour about 100 mL of water.Add approximately 8.5 mL of Conc.Mix in another 700 mL of water and set aside to cool to room temperature.Fill the jar with 1000 mL of water.Give at least one hour for the solution to settle before continuing with the standardization.