H3PO4>H3AsO4>H3SbO4=H3BiO4 order of decreasing acid strength
An acid's acid dissociation constant, which may be measured experimentally using titration techniques, is the standard indicator of an acid's potency. In comparison to weaker acids, stronger acids have a bigger and smaller logarithmic constant. An acid loses a proton more readily the stronger it is.
The size of atom A, which determines the strength of the connection, and the polarity of the bond are two important elements that influence the ease of deprotonation. The stability of the conjugate base affects the strength of the acid as well.
The tendency of an acidic solvent to transfer a proton to a reference solute is measured in addition to the tendency of an acidic solute to transfer a proton to a standard solvent (most frequently water or DMSO).
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