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en.wikipedia.org/wiki/Phosphorous_acid

Phosphorous acid, is the compound described by the formula H 3 PO 3. This acid is diprotic (readily ionizes two protons), not triprotic as might be suggested by this formula. Phosphorous acid is an intermediate in the preparation of other phosphorus compounds.

www.quora.com/What-is-the-acidic-strength-order-of-the-oxo...

What is the acidic strength order of the oxo-acids of Phosphorus: H3PO2, H3PO3, and H3PO4? Update Cancel. a d b y P a r a b o l a. i o. How can I connect MongoDB to Google Sheets? You can write a script that pulls from your MongoDB and hits the Sheets API to add the data there. ... < H3PO3 [pKa~1.5] < H3PO2 [pKa ~1.3].

lavelle.chem.ucla.edu/forum/viewtopic.php?t=1112

You will see that for H3PO3 one of the hydrogens is bonded directly to phosphorus. This is not an acidic hydrogen and therefore H3PO3 is diprotic. On the other hand, H3PO4 is triprotic, all hydrogens bonded to oxygens. Looking at the pKa values we see that pKa1 for H3PO3 is 1.3 where as pKa1 for H3PO4 is 2.1.

pubchem.ncbi.nlm.nih.gov/compound/Phosphorous_acid

Phosphorous acid is a diprotic acid, since the hydrogen bonded directly to the central phosphorus atom is not ionizable. Thus, a more logical chemical formula for phosphorous acid is HPO(OH)2, since three hydroxy groups are not actually present on the acid.

www.reference.com/science/pka-values-phosphoric-acid-7b16...

The pKa for phosphoric acid is 2.15 for the first dissociation, 7.20 for the second dissociation and 12.35 for the third dissociation. These values are based on an ambient temperature of 25 degrees Celsius, and are known as Ka1, Ka2 and Ka3, respectively.

www.chem.wisc.edu/areas/reich/pkatable/pKa_compilation-1...

pKa Data Compiled by R. Williams page-1 pKa Values INDEX Inorganic 2 Phenazine 24 Phosphates 3 Pyridine 25 Carboxylic acids 4, 8 Pyrazine 26 Aliphatic 4, 8 Aromatic 7, 8 Quinoline 27 Phenols 9 Quinazoline 27 Alcohols and oxygen acids 10, 11 Quinoxaline 27 Amino Acids 12 Special Nitrogen Compounds 28 Peptides 13 Hydroxylamines 28

www.quora.com/Why-is-H3PO4-a-weaker-acid-than-H3PO3

This is H3PO3. We know that H3PO4 is a tribasic acid. So it furnishes three hydronium ions in water. But in oxaycids of phosphorus, hydrogen atoms which are attached to oxygen atoms are replaceable. Hydrogen atoms directly bonded to phosphorus cannot be replaced. Hence it furnishes 2 hydronium ions and is weaker than H3PO4

lavelle.chem.ucla.edu/forum/viewtopic.php?t=4454

Do you have to approach the problem differently when you're given the pKa2 value versus the pKa1 value? For part d.) of this particular example, the pKa2 value is given, yet in the solutions manual they write pKa1 as equal to the same value (pKa2=pKa1=1.92), and then calculate the Ka1 from this number.

pubchem.ncbi.nlm.nih.gov/compound/Phosphoric_acid

Phosphoric acid is a sequestering agent which binds many divalent cations, including Fe++, Cu++, Ca++, and Mg++. Phosphoric acid is used in dentistry and orthodontics as an etching solution, to clean and roughen the surfaces of teeth where dental appliances or fillings will be placed.

answers.yahoo.com/question/index?qid=20071126201858AAoJO2w

the lower the pKa, the stronger the acid. HCl, for example, has a pKa of approximately -8. So, the order would be: II, I, IV, III