STEP BY STEP PICTURES
the extract is swirled
The iodine solution added drop by drop during the flask swirled until the pineapple extract change colour turn to blue-black
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From here, we can differentiate the colour of initial pineapple extract and the end after added with iodine solution. So, the iodine solution used from the burette is equal with vitamin C content of pineapple.
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