How to determine between weak acids?

timer Asked: Aug 14th, 2014
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Question Description

The weak acid here is H2TeO3 in comparison with  H2Se3, H2Se4, and H2T3O, but why? How do I figure out with periodic table? 

Tutor Answer

School: UCLA

Since, Tellurium(H2TeO3) is lesser electronegative than  H2Se3, H2Se4, and H2T3O &  H2Se3, H2Se4, and 

H2T3O dissociates more readily than H2TeO3 , therefore these are stronger acid than H2TeO3. 

Tip:: Moving from left to right across a row on the Periodic table elements become more electronegative (excluding the noble gases), and the strength of the binary acid formed by the element increases accordingly:

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