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polyatomic acids

laxboi33
in Inorganic Chemistry

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2H3PO4_Aq_ + 3CA(OH)2 --------> 6H20_liq_ + Ca3(PO4)2_Solid_

 

complete ionic:

 

2H3PO4 + 3Ca + 6OH---->6H20+ Ca3(PO4)2

 

Why doesn't phospohoric acid break down. I understand that it is a strong acid, but could someone give me a better explanation than that?

Because only the first proton can be considered a strong acid. The other 2 are in an equilibrium state.

  • 2 weeks later...

Only the first proton is strongly acidic...after that you would be trying to remove a positive pront from a negative anion (i.e. very hard to do!)

in fact phosphoric acid is a weak acid in all three ionisations. The first is a fairly strong weak acid but it's still considered weak. It's Ka (Ka1) is 7.1 x 10^-3.

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