Question

Why was the starch indicator added near the end point that is when the solution becomes light yellow?

Answer 1

Answer:

When titrating the liberated iodine with the standardized thiosulfate titrant, the starch is only added near the end point to avoid decomposition due to the high iodine concentration. The analyst has a good indication that the end point is near as the solution color typically changes from a dark red to a light yellow.

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Answer 2

When titrating the liberated iodine with the standardized thiosulfate titrant, the starch is only added near the end point to avoid decomposition due to the high iodine concentration. The analyst has a good indication that the end point is near as the solution color typically changes from a dark red to a light yellow.