Citric acid (C6H8O7) is a triprotic acid found naturally in lemon juice, and it is widely used as a flavoring in beverages. What is the molarity of C6H8O7 in commercially available lemon juice if 16.00 mL of 1.60 M NaOH is required in a titration to neutralize 20.0 mL of the juice? How many grams of citric acid are in 100.0 mL of the juice?