Question

why phosphorus acid is Di-protic not Tripotic?????​

Answer 1

Answer:

In H3PO3 only only 2 hydroxide groups exist, instead of 3. If there is 3 hydroxide group, the phosphorous will have 1 lone pair electrons, which will still satisfy the valence electron of Phosphorous

Explanation:

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Answer 2

Answer:

Phosphoric acid is Di-protic but not Tripotic:

Explanation:

As their name suggests, polyprotic acids contain more than one acidic proton. Two common examples are carbonic acid (H2CO3, which has two acidic protons and is therefore a diprotic acid) and phosphoric acid (H3PO4, which has three acidic protons and is therefore a triprotic acid)