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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.