Are metaphosphoric acid and phosphonic acid the same? I have been told that they're same BUT the structures online are different.
Metaphosphoric acid has formula: $\ce{(HPO3)_n}$
phosphonic acid has the formula: $\ce{H3PO3}$
Is this correct?
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1See this answer: http://chemistry.stackexchange.com/questions/40506/what-does-the-prefix-meta-mean-in-inorganic-chemistry/40517#40517 – Nilay Ghosh Mar 22 '17 at 11:53
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Metaphosphoric acids general formula is (HPO3)n ; where n denoted number of phosphoric acid units present in the ring with n being greater or equal to 3. These acids are actually the phosphoric acid units bonded together in rings (cyclic structures), hence forming metaphosphoric acid molecules.
In Metaphosphoric acids, each phosphorus has an oxidation state of +5. Here I am giving you the example of trimetaphosphoric acid i.e. when n is 3.
Phosphonic acid or Orthophosphorous acid is H3PO3 with the oxidation state of phosphorous being +3. Here is its structure:
Yb609
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Not sure phosphorous is +3. Hydrogen attached to it might be hydridic? – Oscar Lanzi Mar 22 '17 at 10:43
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1Yeah, P claims the two electrons from the P-H bond to give 5-2=3. – electronpusher Mar 22 '17 at 20:38