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What is polyprotic acid ?Give example of polyprotic acid and its ionization. |
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Answer» Solution :Polyprotic ACID : The ACIDS which have more than one ionizable proton per molecule of the acid. Such acids are known as polybasic or polyprotic acids. DIPROTIC acid : The acid which have two ionizable proton per molecule of the acid. Such acids are known as Dibasic or Diprotic acid e.g., `H_2X_((aq)) +hArr 2H^(+) + X^(2-) ,K_a` The ionization of the reaction is in two steps is as under , (i) `H_2X+ H_2O hArr H_3O^(+) + HX^(-) "" K_a`(i) (ii)`HX^(-) + H_2O hArr H_3O^(+) + X^(2-) "" K_a` (ii) In it, `K_a (i) gt K_a (ii)` and `K_a (i) xx K_a (ii) = K_a` Examples of diprotic acid :Oxalic acid `(H_2C_2O_4)`, Sulphuric acid `(H_2SO_4)` , Carbonic acid `(H_2CO_3)` , Sulphurous acid `(H_2SO_3)` ,Ascorbic acid etc. Examples of triprotic acid : PHOSPHORIC acid `(H_3PO_4)`, Cytaric acid .... etc. In polyprotic acid solutionconstant MIXTURE of acid like `H_2A, HA^(-)` and `A^(2-)` |
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