(a) H3PO4 is triprotic acid but H3POg is diprotic acid. Why ?(b) NC/3

1.	(a) H3PO4 is triprotic acid but H3POg is diprotic acid. Why ?(b) NC/3 and PC/3 are hydrolysed differently. Why?
Answer» a)H3PO4, phosphoric acid, can be written O=P(OH)3. It has three acidic protons (attached to oxygen) and is therefore tribasic. Its salts are calledphosphates. But H3PO3, phosphonic acid, has one of the hydrogens directly bound to phosphorus as O=PH(OH)2. This means that only two hydrogens are available to act as acids. Its salts are calledphosphonates. There is also an H3PO3, phosphorous acid P(OH)3, thatistribasic. Its salts are calledphosphites. b)In NCl3 it occurs on chlorine in PCl3, it occurs on phosphorus. Water oxidizes the chlorine during the reaction with NCl3 but not in case of PCl3. Fluorine gives ozonized oxygen with water on heating. With interhalogen compounds, the larger halogen will become the hypohalous acid

(a) H3PO4 is triprotic acid but H3POg is diprotic acid. Why ?(b) NC/3 and PC/3 are hydrolysed differently. Why?

Answer»

a)H3PO4, phosphoric acid, can be written O=P(OH)3. It has three acidic protons (attached to oxygen) and is therefore tribasic. Its salts are calledphosphates.

But H3PO3, phosphonic acid, has one of the hydrogens directly bound to phosphorus as O=PH(OH)2. This means that only two hydrogens are available to act as acids. Its salts are calledphosphonates.

There is also an H3PO3, phosphorous acid P(OH)3, thatistribasic. Its salts are calledphosphites.

b)In NCl3 it occurs on chlorine in PCl3, it occurs on phosphorus. Water oxidizes the chlorine during the reaction with NCl3 but not in case of PCl3. Fluorine gives ozonized oxygen with water on heating. With interhalogen compounds, the larger halogen will become the hypohalous acid

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