Question

explain acidity of hydroxyl attached to phosphorous???​

Answer 1

James E. House, Kathleen A. House, in Descriptive Inorganic Chemistry (Third Edition), 2016

14.8.1 Phosphorous Acid and Phosphites

Phosphorous acid, H3PO3, is the acid that forms when P4O6 reacts with water.

(14.60)P4O6 + 6 H2O → 4 H3PO3

For preparing a small amount of the acid in a laboratory, it is more convenient to carefully hydrolyze PCl3.

(14.61)PCl3 + 3 H2O → H3PO3 + 3 HCl

Phosphorous acid is a weak dibasic acid having the molecular structure

The hydrogen atom attached to phosphorus is not acidic so there are only two dissociation constants which have the values Ka1 = 5.1 × 10−2 and Ka2 = 1.8 × 10−7. Normal phosphites contain the ion that has an irregular tetrahedral structure. The acid salts contain .

Organic phosphites are relatively important because they have useful properties and function as reactive intermediates for preparing numerous other compounds. The organic phosphites have the general formulas (RO)2P(O)H and (RO)3P and the structures of these types of compounds are