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  • Smart Learning for All

  • Topic: Rust.

  • Why is oxalic acid used to remove rust stains?

  • Hey.

  • You have a beautiful antique lamp.

  • But look.

  • It has a rust stain on it.

  • No.

  • Don't clean the rust stain with water.

  • Instead, use this oxalic acid.

  • Oxalic Acid.

  • You just don't want my lamp to be nice and shiny, do you?

  • No, I am helping you.

  • Why don't you listen?

  • Because, I know that you are making a fool out of me.

  • Fine.

  • Go ahead.

  • No.

  • See.

  • I had told you.

  • Now will you use the oxalic acid?

  • Look.

  • The stain disappeared.

  • Do you know how this happened?

  • Wait.

  • Let me tell you.

  • Rust is hydrated iron oxide.

  • It is formed when iron reacts with oxygen and water.

  • Rust is insoluble in water.

  • Hence, it is quite difficult to remove rust stains.

  • So, how does oxalic acid remove the stain?

  • Does it have some supernatural powers?

  • Absolutely not.

  • Oxalic acid reacts with rust to form iron oxalate complex ion.

  • Iron oxalate complex ion is soluble in water.

  • Thus, it can easily be washed away, helping us remove the rust stain.

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B1 中級 美國腔

為什麼要用草酸來去除鏽跡?| 草酸是什麼? (Why is oxalic acid used to remove rust stains? | #aumsum)

  • 17 1
    AumSum 發佈於 2021 年 01 月 14 日
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