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Wash the filter with about 15 ml of water, transfer the combined filtrate and washing to a 1-L volumetric flask, dilute to the mark with water, and mix.
Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.
Thirty-five chemical solutions, acids, bases, complexing, argentometric, reducing, oxidising, salts and eluent mixtures, were studied continuously over a 7.5-month period. Twenty-seven remained reasonably stable and had acceptable expiration dates, which were equal to or more than 2 months longer than the established average deviation of DŽ% relative to the initial value
IODINE SOLUTION 0.01 Normal volumetric solution
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