Chemistry Question Urgent. Please really do help if you know the answer.
Explain
a) Lemon juice can be used to remove the brown stains on Chinese wok.
b) Fizzy drink tablets are usually kept in cool dry place.
Thanks
Chemistry daily facts
2006-12-08 5:17 am
回答 (2)
2006-12-08 6:47 am
✔ 最佳答案
a)brown stains on Chinese wok = rust = Metal OxideLemon juice contain citric acid
Acid + Metal Oxide = salt + water
Hence, Metal Oxide has removed from Chinese wok.
b)Fizzy drink tablets contain hydrogencarbonate
Heat and water cause decomposition of hydrogencarbonate to produce carbon dioxide
To prevent fizzy drink tablets become useless, it should be kept in cool dry place
2006-12-08 5:43 am
a) brown stains on wok = rust = Fe2O3
lemon contain citric acid
acid dissolve the oxide.
b) contain hydrogencarbonate, wet heat and water cause decomposition.
lemon contain citric acid
acid dissolve the oxide.
b) contain hydrogencarbonate, wet heat and water cause decomposition.
收錄日期: 2021-04-12 21:26:25
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