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how to check the acidic order of h3po4,h3po3,h3po2.

how to check the acidic order of
h3po4,h3po3,h3po2.

Grade:11

1 Answers

Ramesh V
70 Points
11 years ago

General rule for acids: The more oxygens, the stronger the acid , but the case is different here .. lets study from structure of each acid .

H3PO2 is more acidic than H3PO3 and H3PO4

The acid strength of an acid depends on the number of replacable hydroens it gives per mole of the acid from the structure of the above acids (see below) we can say that H3PO2 gives only one replacable hydrogen while the other two dont give replacable hydrogens(as they are enclosed in a strong bond),by strong bond i mean to say that O-H bond is stronger than P-H bond due to the electronegative difference between hydrogen and oxygen (greater than the electronegative difference between hydrogen and phosphorus)
hence O-H bond is stronger


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