How Many Ionizable Hydrogen Atoms Are in Phosphorus Acid H3PO3?

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Discussion Overview

The discussion revolves around the question of how many ionizable hydrogen atoms are present in phosphorus acid (H3PO3). It includes aspects of chemical understanding and definitions related to acids and their behavior in ionization.

Discussion Character

  • Homework-related
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses confusion about the term "ionizable" and seeks clarification on determining the number of ionizable hydrogen atoms in H3PO3.
  • Another participant defines "ionizable" in the context of acids, stating that it refers to the ability to liberate H+ ions, suggesting that phosphorus acid can release two hydrogen ions, thus having two ionizable hydrogen atoms.
  • A further inquiry is made about how to determine the number of ionizable hydrogen atoms for any random acid, indicating a need for a general method or understanding.
  • A response indicates that knowing the number of ionizable hydrogens is based on familiarity with common acids and their reactions, implying that there is no straightforward method for arbitrary acids.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a method for determining ionizable hydrogen atoms in any acid. There is a clear disagreement on whether a general approach exists for all acids or if it relies solely on prior knowledge of specific acids.

Contextual Notes

The discussion highlights the reliance on established knowledge of acid behavior and the definitions of terms like "ionizable," which may not be universally understood among participants.

Who May Find This Useful

This discussion may be useful for students preparing for chemistry entrance exams, particularly those seeking clarification on acid properties and ionization concepts.

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Homework Statement



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

Homework Equations



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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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