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OpenStudy (anonymous):
You are trying to distinguish between two unknown powders. Both are determined to have a neutral pH, turn gray when mixed with iodine, and do not react to the biuret test. These two unknowns could be:
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OpenStudy (gudden):
Plaster of Paris has a ph 7 and corn starch powder
OpenStudy (gudden):
and even both of them turn to somewhat gray color when react with iodine
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