What it shows
Some adulterants show up with simple tests: starch in milk, paneer or khoa turns blue-black when iodine is added to the boiled and cooled sample, and sawdust or brick powder in spices floats or settles when the powder is sprinkled on water.
This idea has a short entry only. For the science behind it, read the sentence above with your textbook and ask your teacher to explain the law or idea it shows, so you can describe it in your own words.
Materials
- Samples of milk, paneer, turmeric and chilli powder
- Iodine solution
- Glasses of water
- A dropper and white tiles
- A small pan and stove for boiling the samples (adult only)
Safety
For this project: An adult should do the boiling. Do not eat the tested samples. Any test that needs an acid must be done in the school lab with your teacher.
Never use mains electricity: power models with cells, batteries or a low-voltage adapter. Sharp and hot tools, flames and lab chemicals need an adult or your teacher beside you. Keep magnets, button cells and small parts away from young children, and wash your hands after making.
How to go about it
Numbered steps have not been written for this idea yet. Plan it with your teacher: sketch the design with measurements, build one part at a time, test each part, and write every observation with the date. The free ebooks below have step-by-step projects of the same kind.
Free ebooks for this project
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