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Answer on Inorganic Chemistry Question for zoey

Question #22651
how does ethanoic acid, citric acid and sulphamic acid remove limescale from a coffee machine need a scientific explantion please
Expert's answer
Ethanoic acid,citric acid and sulphamic acid is used to remove scale, because the scale is mainly composed of calcium and magnesium. This acid is not harmful to humans, and do not damage the appliance itself.

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Assignment Expert
18.06.2013 07:53

You're most welcome!

17.06.2013 11:10

I'd just like to thank you for posting this, your comment to Toni's post was really good and helped me with my Chem coursework, which I was really struggling with, thanks:)

Assignment Expert
03.06.2013 08:54

Limescale is mainly composed of calcium carbonate, CaCO3. All acids react with carbonate compounds to liberate CO2 gas.
Ethanoic (acetic), citric and sulfamic acids are weak acids, however, they are capable of supplying H+ ions. The H+ ions react with CaCO3 in the following way:
CaCO3(s) + 2H+ --> Ca2+ + CO2(g) + H2O

The limescale is dissolved. The anion of the acid is also in solution with the calcium ions. This solution can be easily washed away, and the limescale is gone. Weak acids like the acetic acid are in vinegar.

02.06.2013 10:51

This doesn't exactly answer HOW the acids remove the limescale :/

Assignment Expert
22.05.2013 08:56

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21.05.2013 13:21

Thanks for posting this, very helpful

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