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Polyprotic acids are specific acids that are capable of losing more than a single proton in acid-base reactions. From the molecular formula if you have more than one hydrogen the acid can be Polyprotic. To determine the strengths between Polyprotic acids with the same number of hydrogen look at the electronegativity of the non-hydrogen bonded atom. Once you lose one hydrogen it becomes much harder for to lose another one which is why Ka values increase.
Another way of finding out if it is a polyphonic species is to look at the charge of the anion of the species. For instance, in H2SO4, Sulfate has a -2 charge, meaning it is capable of accepting two protons whereas Br- is very unlikely to accept two protons. You can apply the same idea to H3PO4 and H2C2O4 (because C2O4 has a -2 charge).
Annie Ye wrote:How do we know if a chemical formula is more polyprotic? How do we determine the strength?
more than 1 ionizable H+, such as H2PO4. The titration curve will have two equilibrium points because there are two points in which the OH- and H+ concentration equal one another.
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