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With this list of possible powders salt chalk sugar wheat flour cornstarch baking powder baking soda how can you identify 4 unknown powders using water vinegar liquid iodine?
Wiki User
∙ 13y ago
Baking soda is pure sodium bicarbonate
Baking powder contains sodium bicarbonate, but it includes starch
Iodine will give a blue color to wheat flour cornstarch baking powder
Vinegar will cause baking powder baking soda and chalk to gas and give of CO2
Add water to all.
salt - completely soluble - clear solution. With a small amount of water - will not completely dissolve - will get saturated.
baking soda - completely soluble - clear solution
sugar - completely soluble - clear solution. With a small amount of water will still completely dissolve unlike salt.
wheat flower - white pasty mix gradually, under repeated mixing pressure and as water is added, it is both plastic and elastic.
cornstarch - white pasty mix - thickens and becomes like glue.
baking powder - mainly soluble but some pasty milky mix
chalk - insoluble
Thus chalk will be identified as the material which gases with vinegar, is insoluble in water but does not turn blue with iodine.
Baking powder will be identified as the material which is mainly soluble, gives gas off with vinegar and yet turns blue with iodine
Baking Soda will be identified as being completely soluble and yet gases with vinegar but does not turn blue with iodine.
Wheat flour and Corn Starch will turn blue with iodine, will not gas with vinegar but behave differently in water and thus can be identified.
Wiki User
∙ 13y ago
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