Chemistry Homework Help

An acid spill occurred at a metal processing plant in which a vat of hydrochloric acid ruptured spilling 30 000 L into the surrounding soils. The acid from a soil sample was extracted and analyzed by titration. A 20.0 mL sample required 16.0 mL of a 2.00 mol/L calcium hydroxide solution to undergo neutralization. What is the concentration of the hydrochloric acid?