Here are some common white powder items that can be tested to see if they react and make iodine change color:
1. Sodium carbonate (washing soda): When a small amount of sodium carbonate is mixed with iodine, it usually turns the iodine solution colorless.
2. Baking soda (sodium bicarbonate): Similar to sodium carbonate, adding a small amount of baking soda to iodine will typically cause the iodine to lose its color.
3. Cornstarch: Mixing iodine with cornstarch may result in a dark blue or purple color, indicating a reaction.
4. Talcum powder: Talcum powder usually does not react significantly with iodine, so the iodine solution will likely retain its brown color.
5. Calcium carbonate (chalk, limestone): Adding calcium carbonate to iodine may produce a yellowish-brown color due to a weak reaction.
6. Citric acid: Citric acid might react with iodine to produce a reddish-brown color.
7. Cornmeal: When iodine comes into contact with cornmeal, no significant reaction is expected.
It is important to note that the results may vary slightly depending on the specific brands and compositions of these white powders. Additionally, it is recommended to conduct these experiments under proper safety guidelines and supervision.
A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color
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