How do you determine whether a molecule is acidic or basic?

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maths12345
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So I wouldn't expect halogen oxides like OCl2 to form acidic solutions, since they don't have protons to donate nor electrons to accept.

However, I found out that OCl2 in water forms hypochlorous acid (HOCL), and this molecule can lose an H+, so it is acidic!

Furthermore, there exists a Chlorine(VII) oxide which gives a very strong acid!

So how do I determine whether a molecule is acidic or basic?
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Pigster
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It is all to do with their reaction with water.

Na2O doesn't look like an alkali, since it doesn't contain OH-, likewise Cl2 doesn't look like an acid, since it doesn't contain H+.

But... add them to water and you get NaOH and HCl & HClO.

"metal oxides are basic, non-metal oxides are acidic", is a good rule of thumb.
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maths12345
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(Original post by Pigster)
It is all to do with their reaction with water.

Na2O doesn't look like an alkali, since it doesn't contain OH-, likewise Cl2 doesn't look like an acid, since it doesn't contain H+.

But... add them to water and you get NaOH and HCl & HClO.

"metal oxides are basic, non-metal oxides are acidic", is a good rule of thumb.
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