The first and second dissociation constant of an acid $$H2A$$ are $$1.0$$ × $$10-5$$ and $$5.0$$ × $$10-10$$ respectively. The overall dissociation constant of the acid will be

Question

The first and second dissociation constant of an acid $$H2A$$ are $$1.0$$ × $$10-5$$ and $$5.0$$ × $$10-10$$ respectively. The overall dissociation constant of the acid will be

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$$H2A$$  ⇌  $$HA-$$  $$+$$  $$H+K1$$ $$=$$ $$HA-$$ $$H+H2A$$            ….. $$(1)HA-$$  ⇌  $$H+$$  $$+$$  $$A2-K2$$ $$=$$ $$H+A-2HA-$$         …..$$(2)For$$ the $$reactionH2A$$  ⇌  $$2H++$$ $$A2-K$$ $$=$$ $$HA-$$ $$H+H2A$$  x  $$H+$$ $$A2-HA-$$ $$=H+2$$ $$A2-H2A$$  $$=$$ $$K1$$  ×  $$K2=$$ $$1$$ × $$10-5$$ ×  $$5$$ × $$10-10$$ $$=$$ $$5$$ × $$10-15$$

The first and second dissociation constant of an acid $H_{2} A$ are $1.0 \times 10^{- 5}$ and $5.0 \times 10^{- 10}$ respectively. The overall dissociation constant of the acid will be

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The first and second dissociation constant of an acid H2A are 1.0 × 10-5 and 5.0 × 10-10 respectively. The overall dissociation constant of the acid will be

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The first and second dissociation constant of an acid $H_{2} A$ are $1.0 \times 10^{- 5}$ and $5.0 \times 10^{- 10}$ respectively. The overall dissociation constant of the acid will be