How to Determine Bonding in Lewis Structures for Oxoacids

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ldv1452
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When drawing a Lewis structure for a compound how do you know what bonds to what? For example, with H2SO4, how does one know whether the H bond to O or to S?
 
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A little bit of guessing and a little bit of knowing. Hydrogen in oxoacids is (almost) always attached to oxygen.
 
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