A chemist must prepare 800.0 mL of hydrochloric acid solution with a pH at 0.60 at 25°C. He will do this in three steps.
• Fill a 800.0 mL volumetric flask about halfway with distilled water.
• Measure out a small volume of concentrated (8.0 M) stock hydrochloric acid solution and add it to the flask.
• Fill the flask to the mark with distilled water.
Calculate the volume of concentrated hydrochloric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits.