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I understand the acidity of a substance increases with electronegativity and size (valence shell space) of an atom (periodic trend) that contains a hydrogen atom (Brønsted-Lowry). However when looking at following pairs, I am not able to determine which one is a stronger acid.

$$\ce{H3O+ ,\ H2O}$$

Further, I would want to reason, the relationship between the charge and acidity/ basicity.

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marked as duplicate by Martin - マーチン, Loong, bon, ron, Community Jun 10 '15 at 14:22

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