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arrange the following acids in the order of increasing acidity.
H3PO3,H3PO2,H3PO4
Dear Govindaraj,
Here, the O atoms draw electrons away from Z atom and make it more positive. The Z atom, therefore, becomes more effective in withdrawing electron density. In turn, electrons of the H – O bond are drawn more strongly away from the H atom. The net effect makes it easier for the proton to dissociate and increases the acidity of the compound. With more number of 0 atoms bonded to Z, the compound becomes a stronger acid.
The acid strength is also explained by the oxidation number of central atom ( here P )
H3PO2 - +1
H3PO3 - +3
H3PO4 - +5
The acid strength is also explained by counting the number of oxygen atoms bonded to P
hence order of acidity is : H3PO4 > H3PO3 >H3PO2
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