ORTHOPHOSPHORIC ACID,

Phosphorous forms a number of oxoacids which differ in their structures and oxidation state of phosphorous. Each of them has at least one P = O or P rarr O unit and one P-OH units. The OH group is ionisable but H atom linked directly to P is nonionisable. structures of all the acids are considered to be derived from phosphorous acid or phosphoric acid. The number of P-H, P rarr O or P = O & P-O-H bonds in orthophosphoric acid are respectively:

Write complete balanced reactions for the following : (a) Red phosphorous reacts with iodine in presence of water. (b) White phosphrous is boiled with a strong solution of NaOH in an inert atmosphere. ( c) Phosphorous reacts with conc. HNO_3 to give H_3PO_4 . (d) Iodine reacts with concentrated nitric acid. (e) Orthophosphoric acid is heated with nitric acid and ammonium molybdate. (f) Disodium hydrogen phosphate is added to ammonical solution of magnesium sulphate. (g) Magnesium is burnt in air and the product is treated with water. (h) Phosphine is passed through AgNO_3 solution. (i) A mixture of air and ammonia is passed over heated platinum gauze. (j) Gold is treated with aqua regia. (k) Water is added to calcium phosphide. (l) Calcium phosphate is heated with a mixture of sand and carbon. (m) Phosphorous reacts with nitric acid to give equimolar ratio of nitric oxide and nitrogen dioxide. (n) Zinc is treated the very dilute nitric acid. (o) Phosphine is treated with an acidified CuSO_4 solution.

pH Determination OF Aqueous Solution OF Weak Acid and Strong Acid||Weak Acid and Weak Acid|| Polyprotic Acid