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When titrating lemon juice with iodine solution in the presence of starch, the color changes from yellow to blue-black. Initially, the iodine solution is brown, which indicates the presence of free iodine. As the titration progresses and all the available ascorbic acid in the lemon juice reacts with the iodine, excess iodine will react with the starch, resulting in the blue-black color. This color change signifies the endpoint of the titration.

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2mo ago

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