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For a diprotic acid, which of the follow...

For a diprotic acid, which of the following is true for `1^(st)` and `2^(nd)` ionization constants (`K_(a_(1))` and `K_(a_(2))`)

A

`K_(a_(1)) =K_(a_(2))`

B

`K_(a_(1)) gtK_(a_(2))`

C

`K_(a_(2))gt K_(a_(1))`

D

`K_(a_(2)) ge K_(a_(1))`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(a_(1))gtK_(a_(2)`
The reason for this is that it is more difficult to remove a positively charged proton from a negative ion due to electrostatic forces. For e.g., `H_(2)X_((aq)) overset (K_(a_(1))) hArr H_((aq))^(+) + HX_((aq))^(-)`
`HX_((aq))^(-) overset (K_(a_(2))) hArrH_((aq))^(+)+X_((aq))^(2-)`
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