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• Dissolve 0.250 g vitamin C (ascorbic acid) in 100 ml distilled water.
• Dilute to 250 ml with distilled water in a volumetric flask. Label the flask as your vitamin C standard solution.
• Add 25.00 ml of vitamin C standard solution to a 125 ml Erlenmeyer flask. Add 10 drops of 1% starch solution. Rinse your buret with a small volume of the iodine solution and then fill it. Record the initial volume. Titrate the solution until the endpoint is reached. This will be when you see the first sign of blue color that persists after 20 secon...
• Add 25.00 ml of juice sample to a 125 ml Erlenmeyer flask. Titrate until the endpoint is reached. (Add iodine solution until you get a color that persists longer than 20 seconds.) Repeat the titration until you have at least three measurements that agree to within 0.1 ml.

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