Sample problem 5 A factory is suspected of polluting a stream with hydrochloric acid from its waste water. To gather evidence, a sample of stream water was collected downstream from the discharge point. Back in the laboratory, a 20.00 mL sample of this water was titrated against a solution of sodium carbonate that had been accurately diluted to 0.0010 M; 17.52 mL was required. Assuming that the only acid in the sample was hydrochloric acid: a. calculate the molarity of hydrochloric acid in the sample. b. calculate the concentration of the hydrochloric acid in g L-', mg L-' and ppm