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How many fluid ounces of the drink must be consumed to provide a normal adult with the minimum daily requirement of ascorbic acid(vitamin C)? You will have to find the present daily requirement is. There was 3.24 mg of ascorbic acid in the 10.00 mL juice drink. I found the daily requirement for an adult male is 90 mg so I did, 90mg(10ml/3.24mg)(1fluid ounce/29.6ml)=9.38 fluid ounces, but I would like some help with this.