How Many Ionizable Hydrogen Atoms Are in Phosphorus Acid H3PO3?

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Phosphorus acid (H3PO3) contains two ionizable hydrogen atoms, which can be released as H+ ions, resulting in the HPO32- ion. The term "ionizable" refers to the ability of hydrogen atoms in an acid to dissociate and form ions. To determine the number of ionizable hydrogen atoms in an unknown acid, one must be familiar with common acids and their behaviors. This knowledge is essential for understanding acid-base reactions and their properties. Overall, familiarity with acid characteristics is crucial for identifying ionizable hydrogen atoms.
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Homework Statement



What are the number of ionizable hydrogen atoms in phosphorus acid H3PO3?

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The Attempt at a Solution


I didn't even know what "ionizable " means. ( This is not a homework questions, I'm solving sample questions for an entrance exam) . So I searched the web . But still I don't know how to decide the number of ionizable hydrogen atoms in H3PO3 . Please help.
 
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Ionizable means that it can be made into an ion, which in the context of hydrogen in an acid means that it will liberate a H+ ion.

Have a look at http://en.wikipedia.org/wiki/Phosphorous_acid#Acid-base_properties. At most 2 hydrogen ions will leave phosphorus acid, leaving HPO32-. Therefore, phosphorus acid has two ionizable hydrogen atoms.
 
@DrClaude But if I'm just given a random acid how can I find the number of onizable hydrogen atoms?
 
You can't. It something you have to know: what are the common acids and how they react.
 

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